31. Inter-Integrated Circuit (I2C)

Owned by Longson Huang
Last updated: Sept 29, 2021 by edwin.chiu (Unlicensed)
20 min read


31.1 Introduction

I2C is invented by Philips Semiconductor and typically used for attaching lower-speed peripheral ICs communication. Two bus lines are required: a serial data line (SDA) and a serial clock line (SCL). There are four I2C master devices in SP7021, the registers space locate to address 0x9C004600~0x9C0049FF. They support the following functions:

  • Support Standard-mode (100KHz) and Fast-mode (400KHz)
  • Buffer depth reach FIFO 32
  • Support Read Mode, Write Mode and Restart Mode
  • Support DMA function


31.2 Function Diagram

A generalized function diagram of I2C Master Function Block is shown in Figure 31-1. I2C Master Controller will send Write or Read command after setting registers. The I2C Master will detect clock stretching when SCL low after receiving (or sending) a byte.

Figure 31-1 I2C MASTER Function Block

  • CLOCK GENERATION: The CLK generation circuit can generate SCL signal by setting register.
  • WAIT COUNTER: The wait counter circuit can detect clock stretching using SCL signal.
  • SHIFT CIRCUIT: The shift circuit can send data to SDA signal, or receive data from SDA signal.
  • NOISE FILTER: Noise Filter pass the signals only if the signal hold for require time. The require time can be set by register.
  • DATA FIFO: The write data can save in Data FIFO then transmit to I2C slave device.
  • DATA BUFFER: The DATA BUFFER module support I2C READ and I2C WRITE in normal mode.
  • GDMA: GDMA module is used for DMA function, support I2C READ and I2C WRITE.
  • CDC: Register CDC for clock domain crossing between 27MHz clock and SYS_CLK.


31.3 I2C Data Format

Figure 31-2 I2C Data Format

  • Every byte put on the SDA line must be eight bits long
  • The number of bytes that can be transmitted per transfer is unrestricted
  • The first byte include 7 bits slave address and 1 bit Read(HIGH)/Write(LOW)
  • START: SDA HIGH to LOW while SCL is HIGH
  • STOP: SDA LOW to HIGH while SCL is HIGH
  • ACK: SDA will pull LOW in the 9th clock period
  • NACK: SDA will remain HIGH in the 9th clock period

Figure 31-3 ACK and NACK condition

31.4 Clock Frequency Selection

When FREQ set to 1/2/3/4/5/6/7, it will map to divider as 1024/512/256/128/64/32/16 and the I2C clock will be 27MHz/divider. The FREQ is bit[26:24] of Group140.0 control0 register. When FREQ set to 0, then the I2C clock frequency can be set by FREQ_CUSTOM. The calculation formula is 27MHz/FREQ_CUSTOMThe FREQ_CUSTOM located in register Group140.2 (CONTROL2)[10:0].

31.5 Software Reset

A software reset can be performed by set SW_RST bit to 1. The SW_RST locate at bit15 of Group140.0 control0 register. In that case, I2C lines SCL and SDA are released. Internal states machines are reset and communication control bits, as well as status bits come back to their reset value. The configuration registers are not impacted.

31.6 NACK FLAG

When I2C master do the write transaction, the slave device is NACK. The bit0 of Group140.4 control4 register will become 1, it means I2C master write byte1 NACK. The bit1=1, means I2C master write byte2 NACK. Max can indicate 32 byte NACK. To clear the NACK flag, please set corresponding bit of Group140.3 control3 register.

31.7 I2C Operation Mode

31.7.1 Read mode & Burst Read mode

I2CM0 provides a read function. The read procedure as below:

  • Set clock div value, PREFETCH=1 and SLAVE ADDR. For detailed settings, please refer to register Group140.0 (CONTROL0)[26:24], register Group140.0 (CONTROL0)[18] and register Group140.0 (CONTROL0)[7:1].
  • Set the number of BYTEs that need to be read. You can set 1~65535. For detailed settings, please refer to register Group140.17 (CONTROL7)[31:16].
  • If the read data is larger than 32bytes, set I2CRDATA_EN=1 (Group140.13 register).
  • After receiving the interrupt, read the corresponding data.
  • Clear interrupt, set I2CWRDATA_CLR=1 (Group140.12 register)


31.7.2 Write mode & Burst Write mode

I2CM0 provides a write function. The write procedure as below:

  • Set clock div value, SLAVE ADDR. For detailed settings, please refer to register Group140.0 (CONTROL0)[26:24] and register Group140.0 (CONTROL0)[7:1].
  • Set the number of BYTEs that need to be written. You can set 1~65535. Setting 0byte will be wrong. For detailed settings, please refer to register Group140.17 (CONTROL7)[15:0]
  • Set the data to be written. Write up to 32 bytes for the first time. For detailed settings, please refer to register Group140.24-28 (DATA).
  • If the data is over 32 bytes, you can set CTL_EMPTY_THRESGOLD and EMPTY_THRESHOLD_EN. For detailed settings, please refer to register Group140.8 (I2CM INT_EN0)[11:9] and Group140.8 (I2CM INT_EN0)[6].
  • After triggering EMPTY_THRESHOLD_FLAG (refer to Group140.7 (INTERRUPT)[6]), read RING_VALUE (refer to Group140.5 (CONTROL5)[23:21]) to write a few 4 Bytes, or directly write the number of CTL_EMPTY_THRESGOLD*4 Bytes
  • Write Group140.24 (DATA) register, 4 Bytes data at a time
  • After writing, clear EMPTY_THRESHOLD_FLAG by write Group140.1 (CONTROL1)[6]=1 at first, then write Group140.1 (CONTROL1) [6]=0.
  • After writing the required data, set EMPTY_THRESHOLD_EN=0.


31.7.3 Restart Mode(selective read)

I2CM0 provides the restart function that directly read after writing, and does not need to issue STOP and then START, providing the function of first write the read address and then read the data.

  • You need to first set MANUAL_MODE=0 and set MANUAL_TRIG=0. For detailed settings, please refer to register Group140.9 (I2CM_MODE)[1] and Group140.9 (I2CM_MODE)[0].
  • Set the number of BYTEs that need to be written and read. For detailed settings, please refer to register Group140.17 (CONTROL7)[31:16]RDCOUNT, register Group140.17 (CONTROL7)[15:0]WRCOUNT.
  • Set the data to be written. For detailed settings, please refer to register Group140.24-28(DATA).
  • Set clock div, PREFETCH=1, RESTART_EN=1, SUBADDR_EN=1 and SLAVE ADDR. For detailed settings, please refer to register Group140.0 (CONTROL0)[26:24], register Group140.0 (CONTROL0)[18], register Group140.0 (CONTROL0)[17], register Group140.0 (CONTROL0)[16], register Group140.0 (CONTROL0)[7:1].
  • Set MANUAL_MODE =0 and set MANUAL_TRIG =1. For detailed settings, please refer to register Group140.9 (I2CM_MODE)[1] and Group140.9 (I2CM_MODE)[0].


31.7.4 I2C DMA Read Mode

The DMA read data transmission procedure is as following figure.

Figure 31-4 I2C DMA Read Mode


I2CM provides read from I2C slave to DRAM functionality.

  • Set DMA MODE=1, refer to Group140.9 (I2CM MODE)[2].
  • Set clock div value, PREFETCH and SLAVE ADDR. For detailed settings, please refer to register Group140.0 (CONTROL0)[26:24], register Group140.0 (CONTROL0)[18] and register Group140.0 (CONTROL0)[7:1].
  • Set DMA destination address, refer to Group141.3 (DMA_ADR)[31:0].
  • Set the number of BYTEs that the DMA needs to write. Refer to Group141.2 (DMA_LENGTH)[24:0].
  • Set DMA WRITE MODE=1, DMA_GO=1, refer to Group141.1 (DMA_CONFIG)[0] and Group141.1 (DMA_CONFIG)[8].
  • Set I2C_DONE_EN=0 and DMA_DONE_EN=1, refer to register Group140.8 (I2CM INT EN)[1] and Group141.6 (INT EN)[0], and wait GDMA_DONE interrupt in register Group141.5 (INT_FLAG)[0].
  • Clear GDMA_DONE interrupt in register Group141.5 (INT_FLAG)[0].


31.7.5 I2C DMA Write Mode

The DMA write data reception procedure is as follows:

Figure 31-5 I2C DMA Write Mode


I2CM provides write data to I2C Slave, which data from DRAM function.

  • Set DMA MODE=1, refer to Group140.9 (I2CM MODE)[2].
  • Set clock div, SLAVE ADDR. For detailed settings, please refer to register Group140.0 (CONTROL0)[26:24] and register Group140.0 (CONTROL0)[7:1].
  • Set DMA source address, refer to Group141.3 (DMA_ADR)[31:0].
  • Set the number of BYTEs that the DMA needs to write. Refer to Group141.2 (DMA_LENGTH)[24:0].
  • Set DMA WRITE MODE=0, DMA_GO=1, refer to Group141.1 (DMA_CONFIG)[0] and Group141.1 (DMA_CONFIG)[8].
  • Set I2C_DONE_EN=0 and wait I2C_DONE interrupt, refer to register Group140.8 (I2CM INT EN)[1] and Group140.7 (I2CM INTERRUPT)[1].
  • Clear I2C_DONE interrupt


31.7.6 I2C DMA Restart Mode

The DMA restart data reception procedure is as follows. Direction1 means write to I2C slave from register, Direction2 means read from I2C slave to DRAM.

Figure 31-6 I2C DMA Restart Mode


I2CM provides restart write to I2C slave from register, read I2C slave to DRAM function.

  • First set the I2C Registers
  • Set DMA MODE=1, MANUAL_MODE=0, MANUAL_TRIG=0, refer to Group140.9 (I2CM MODE)[2], register Group140.9 (I2CM_MODE)[1] and Group140.9 (I2CM_MODE)[0].
  • Set clock div, PREFETCH=1, RESTART_EN=1, SUBADDR_EN=1, SLAVE ADDR. For detailed settings, please refer to register Group140.0 (CONTROL0)[26:24], register Group140.0 (CONTROL0)[18], register Group140.0 (CONTROL0)[17], register Group140.0 (CONTROL0)[16], register Group140.0 (CONTROL0)[7:1]
  • Set the number of BYTEs to be written. For detailed settings, please refer to register Group57.CONTROL7[31:16], register Group57.CONTROL7[15:0]
  • Set the data to be written. For detailed settings, please refer to register Group140.24-28 (DATA).
  • Receiver set GDMA Register
  • Set DMA destination address, refer to Group141.3 (DMA_ADR)[31:0].
  • Set the number of BYTEs that the DMA needs to write. Refer to Group141.2 (DMA_LENGTH)[24:0].
  • Set DMA WRITE MODE=1, DMA_GO=1, refer to Group141.1 (DMA_CONFIG)[0] and Group141.1 (DMA_CONFIG)[8].
  • Reset I2C Register
  • Set to MANUAL_MODE=0 and set MANUAL_TRIG=1. For detailed settings, please refer to register Group140.9 (I2CM_MODE)[1] and Group140.9 (I2CM_MODE)[0].
  • If the data is over 32BYTES, you can set CTL_EMPTY_THRESHOLD and EMPTY_THRESHOLD_EN. For detailed settings, please refer to register Group140.8 (I2CM INT_EN0)[11:9] and Group140.8 (I2CM INT_EN0)[6].
  • After triggering EMPTY_THRESHOLD_FLAG Group140.7 (INTERRUPT)[6], read RING_VALUE Group140.5 (CONTROL5)[23:21] to write a few 4 Bytes, or directly write the number of CTL_ EMPTY_THRESHOLD *4 Bytes
  • Write Group140.24 (DATA), 4 Bytes data at a time
  • After writing, clear EMPTY_THRESHOLD_FLAG, write Group140.1 (CONTROL1)[6]=1, then write Group140.1 (CONTROL1) [6]=0.
  • After writing the required information, set EMPTY_THRESHOLD_EN to 0.
  • Set I2C_DONE_EN=0 and DMA_DONE_EN=1, refer to register Group140.8 (I2CM INT EN)[1] and Group141.6 (INT EN)[0], and wait GDMA_DONE interrupt in register Group141.5 (INT_FLAG)[0].
  • Clear GDMA_DONE interrupt in register Group141.5 (INT_FLAG)[0].


31.8 FIFO Operation

The RING_VALUE shows the redundant size of the FIFO (4*n bytes) in register Group140.5 (CONTROL5)[23:21], and can set CTL_EMPTY_THRESHOLD (register Group140.8 (INT_EN0)[11:9]) and EMPTY_THRESHOLD_EN (register Group140.8 (INT_EN0)[ 6]) to trigger interrupt, then write data.The number of writing and reading bytes of FIFO is displayed by FIFO_RCOUNTER (register Group140.6 (I2CM_STATUS0)[31:16]) and FIFO_WCOUNTER (register Group140.6 (I2CM_STATUS0)[15:0]). RINC_INDEX (register Group140.7 (I2CM INTERRUPT)[21:19]) and WINC_INDEX (register Group140.7 (I2CM INTERRUPT)[18:16]) show FIFO write and read indicators.Monitor WFIFO_ENABLE (register Group140.7 (I2CM INTERRUPT)[10]), FULL_FLAG (register Group140.7 (I2CM INTERRUPT)[9]), EMPTY_FLAG (register Group140.7 (I2CM INTERRUPT)[8]) to determine if writing can continue.

31.9 Clock stretching

Detect if the slave has pulled SCL signal. If the slave is found to hold SCL signal, the master will enter the wait state, pause the transmission and send a notification. Master will wait for the slave to release SCL, then stop the transmission and wait for the next transmission. Automatic continuous transfer is not supported currently.For detailed settings, please refer to SCL_WAIT_FLAG (register Group140.7 (I2CM INTERRUPT)[7]), SCL_WAIT_INT_EN (register Group140.8 (I2CM INT_EN0)[7]), SCL_WAIT_CLR (register Group140.1 (CONTROL1)[7]), SCL_WAIT_TIME (register Group140.11 (I2CM_STATUS2)[9:0]). If you pull the Clock stretching before returning the ACK, you need to see CLK_ERR_FLAG (register Group140.7 (I2CM INTERRUPT)[2]).

31.10 I2C Interrupt Handler

I2C interrupt handler handle the internal interrupt of I2C Master Module. Group140.8 (i2cm_int_en0) register can enable interrupt for each status. An interrupt is issued when i2c active done or an interrupt is issued when FIFO data can receive or transmit data. Read Group140.7 (i2cm_interrupt) register to see what interrupt happened. After read register, need to clear interrupt flag by write Group140.1 (control1) register. I2C Master0 in IRQ number is 174, I2C Master1 in IRQ number is 175, I2C Master2 in IRQ number is 176 and I2C Master3 in IRQ number is 177.Table 31-1 shows the interrupt events in the Group140.7 (i2cm_interrupt) register.

Fields

Event flag

Interrupt event

Bit 9

FULL_FLAG

Monitor I2C master ring FIFO full flag.

Bit 8

EMPTY_FLAG

Monitor I2C master ring FIFO empty flag.

Bit 7

SCL_WAIT_FLAG

I2C SCL bus waits (when I2C SCL waits by I2C slave device).

Bit 6

EMPTY_THRESHOLD_FLAG

When I2C master ring value (read index - write index) >= empty threshold

Bit 5

DATA_NACK_FLAG

Monitor i2c slave, data NACK (when I2C master transmit).

Bit 4

ADDRESS_NACK_FLAG

Monitor i2c slave, slave address NACK (when I2C master transmit).

Bit 3

BUSBUSY_FLAG

When I2C master engine is idle, monitor the I2C is idle or not.

Bit 2

CLKERR_FLAG

I2C master active, monitor SCL input active error flag.

Bit 1

DONE_FLAG

I2C master active done flag.

Bit 0

SIFBUSY_FLAG

When I2C master engine active flag.

Table 31-1 Interrupt Event


Figure 31-7 I2C Interrupt Tree

31.11 Registers Map

31.11.1  Register Memory Map

I2C Register Memory Map

Group Base Address

Data Width

Group No.

Module

0x9C004600

32

140

I2CM0

0x9C004680

32

141

I2CM0_GDMA

0x9C004700

32

142

I2CM1

0x9C004780

32

143

I2CM1_GDMA

0x9C004800

32

144

I2CM2

0x9C004880

32

145

I2CM2_GDMA

0x9C004900

32

146

I2CM3

0x9C004980

32

147

I2CM3_GDMA

Table 31-2 I2C Register Memory Map


All I2Cs' registers have the same offset (address - base address) in corresponding I2C register group. Only I2C0 and its corresponding DMA (I2C0 DMA) registers are described in following register description, for other I2Cs (I2C1, 2, 3) please refer to I2C0 description for more detail.

31.11.2  Registers Description


I2C Register Description


RGST Table Group 140 I2C Master0

140.0 I2C Master Control 0 (control0)
Address: 0x9C004600
Reset: 0x0211 0060


Field Name

Bit

Access

Description

RESERVED

31:27

RO

RESERVED

FREQ

26:24

R/W

Serial bus master speed selection.

0x0: custom— customized set for I2C clock
0x1: div 1024— 27MHz div 1024.
0x2: div 512— 27MHz div 512.(default)
0x3: div 256— 27MHz div 256.
0x4: div 128— 27MHz div 128.
0x5: div 64— 27MHz div 64.
0x6: div 32— 27MHz div 32.
0x7: div 16— 27MHz div 16.

RESERVED

23:19

RU

RESERVED

PREFETCH

18

R/W

Writing this bit will initiate master I2C read action, the address is set (eg. 0x10) and the corresponding data is stored in the register (eg. 0x18).
In restart mode this bit have to set 1'b1

RESTART EN

17

R/W

This bit determines whether the Synchronous serial in- terface's repeat start condition.(Only enable when Syn- chronous Serial interface read.)

0: disable— Do not repeat start.(default)
1: enable— Repeat start.

SUBADDR EN

16

R/W

The I2C master read transaction will include device sub- address, in restart mode this bit have to set 1'b1

0: disable— skip subaddress
1: enable— inlcude sub address(default)

SW RST

15

OTHER

Local reset I2C master

0: normal(default)
1: reset

RESERVED

14:8

RU

RESERVED

SLAVE ADDR

7:1

RW

Decide serial bus slave address for the function of serial bus master (In master mode), want to access the slave device address

RESERVED

0

RO

RESERVED


140.1 I2C Master Control 1 (control1)

Address: 0x9C004604
Reset:0x0

Field Name

Bit

Access

Description

RESERVED

31:10

RO

RESERVED

I2CEMPTY CLR

9

WO

clear empty flag, write "1" to clear

0: none(default)
1: clear

SCL HOLD TOO LONG CLR

8

WO

I2c scl wait too long(when I2C scl wait by I2C slave de- vice), write "1" to clear

0: none(default)
1: clear

SCL WAIT CLR

7

WO

I2c scl wait (when I2C scl wait by I2C slave device), write "1" to clear

0: none(default)
1: clear

EMPTY THRESHOLD CLR

6

WO

I2c master fifo ring empty threshold (when I2C master empty threshold), write "1" to clear

0: none(default)
1: clear

DATA NACK CLR

5

WO

Monitor i2c slave, data NACK (when I2C master transm- mit), write "1" to clear

0: none(default)
1: clear

ADDRESS NACK CLR

4

WO

Monitor i2c slave, slave address NACK (when I2C mas- ter transmmit), write "1" to clear

0: none(default)
1: clear

BUSY CLR

3

WO

I2C bus busy (when I2C master is idle), write "1" to clear

0: none(default)
1: clear

CLKERR CLR

2

WO

Monitor the scl status when I2C master active, if the error condition occused , use this bit to clear the flag

0: none(default)
1: clear

ACTIVE CLR

1

WO

Done flag for i2c master read or write actions, write "1" to clear

0: none(default)
1: clear

SIFBUSY CLR

0

WO

I2c master start to active flag clear, write "1" to clear

0: none(default)
1: clear


140.2 I2C Master Control 2 (control2)

Address: 0x9C004608
Reset: 0x1522 07FF

Field Name

Bit

Access

Description

RESERVED

31

RO

RESERVED

SCLKI DLY5

30

RW

determine scl rising trigger time delay 5T or 1T.If freq > 675KHz, sclki dly5=0

0x0: delay 1T trigger(default)
0x1: delay 5T trigger

PRE DRIVE

29:28

RW

Pre-drive for sub-address msb is "1" for 400K high speed mode, now don't have sub-addr, just for last read nack.

0x0: no pre-drive
0x1: pre-drive 1T(default)
0x2: pre-drive 3T
0x3: pre-drive 5T

SDA DLY

27:26

RW

Delay the I2C sda output disable time

0x0: original— original output disable
0x1: delay 1 T— delay 1 T(27Mhz )(default)
0x2: delay 3 T— delay 3 T(27Mhz )
0x3: delay 5 T— delay 5 T(27Mhz)

SCL DLY

25:24

RW

R/W Delay the I2C scl output disable time

0x0: original— original output disable
0x1: delay 1 T— delay 1 T(27Mhz )(default)
0x2: delay 3 T— delay 3 T(27Mhz )
0x3: delay 5 T— delay 5 T(27Mhz)

SDA FILTER

23:20

R/W

To filter I2C sda input for bus monitor

0x0: 0 — continuous same data input
0x1: 1 — continuous same data input
0x2: 2 — continuous same data input(default)
0x3: 3 — continuous same data input
0x4: 4 — continuous same data input
0x5: 5 — continuous same data input
0x6: 6 — continuous same data input
0x7: 7 — continuous same data input
0x8: 9 — continuous same data input
0x9: 11 — continuous same data input
0xa: 13 — continuous same data input
0xb: 15 — continuous same data input
0xc: 17 — continuous same data input
0xd: 19 — continuous same data input
0xe: 21 — continuous same data input
0xf: 23 — continuous same data input

SCL FILTER

19:16

R/W

To filter I2C scl input for bus monitor

0x0: 0 — continuous same data input
0x1: 1 — continuous same data input
0x2: 2 — continuous same data input(default)
0x3: 3 — continuous same data input
0x4: 4 — continuous same data input
0x5: 5 — continuous same data input
0x6: 6 — continuous same data input
0x7: 7 — continuous same data input
0x8: 9 — continuous same data input
0x9: 11 — continuous same data input
0xa: 13 — continuous same data input
0xb: 15 — continuous same data input
0xc: 17 — continuous same data input
0xd: 19 — continuous same data input
0xe: 21 — continuous same data input
0xf: 23 — continuous same data input

RESERVED

15:12

RO

RESERVED

FRQ CUSTOMDIV8 SEL

11

R/W

Adjust the sda active position

0: 1/2— sda start to active is middle of scl is low(default)
1: 1/4— sda start to active is 1/4 of scl is low

FRQ CUSTOM

10:0

R/W

Adjust I2C clock freq when reg FREQ = 3'b000, SCL clock = 27MHz / (frq custom[10:0]+1)


140.3 I2C Master Control 3 (control3)

Address: 0x9C00460C
Reset: 0x0


Field Name

Bit

Access

Description

NACK CLR

31:0

W1C

To clear the NACK flag, write "1" to clear flag. For bust mode,
bit00: write "1" to clear BYTE0 NACK flag
bit01: write "1" to clear BYTE1 NACK flag
bit02: write "1" to clear BYTE2 NACK flag
bit03: write "1" to clear BYTE3 NACK flag
bit04: write "1" to clear BYTE4 NACK flag
bit05: write "1" to clear BYTE5 NACK flag
bit06: write "1" to clear BYTE6 NACK flag
bit07: write "1" to clear BYTE7 NACK flag
bit08: write "1" to clear BYTE8 NACK flag
bit09: write "1" to clear BYTE9 NACK flag
bit10: write "1" to clear BYTE10 NACK flag
bit11: write "1" to clear BYTE11 NACK flag
bit12: write "1" to clear BYTE12 NACK flag
bit13: write "1" to clear BYTE13 NACK flag
bit14: write "1" to clear BYTE14 NACK flag
bit15: write "1" to clear BYTE15 NACK flag
bit16: write "1" to clear BYTE16 NACK flag
bit17: write "1" to clear BYTE17 NACK flag
bit18: write "1" to clear BYTE18 NACK flag
bit19: write "1" to clear BYTE19 NACK flag
bit20: write "1" to clear BYTE20 NACK flag
bit21: write "1" to clear BYTE21 NACK flag
bit22: write "1" to clear BYTE22 NACK flag
bit23: write "1" to clear BYTE23 NACK flag
bit24: write "1" to clear BYTE24 NACK flag
bit25: write "1" to clear BYTE25 NACK flag
bit26: write "1" to clear BYTE26 NACK flag
bit27: write "1" to clear BYTE27 NACK flag
bit28: write "1" to clear BYTE28 NACK flag
bit29: write "1" to clear BYTE29 NACK flag
bit30: write "1" to clear BYTE30 NACK flag
bit31: write "1" to clear BYTE31 NACK flag


140.4 I2C Master Control 4 (control4)

Address: 0x9C004610
Reset: 0x0

Field Name

Bit

Access

Description

NACK FLAG

31:0

RO

When I2C master do the write transaction , the slave device is nack.
The bit 0 means I2C master write the first byte nack.
0: none(default)
1: occur


140.5 I2C Master Control 5 (control5)
Address: 0x9C004614
Reset: 0x0


Field Name

Bit

Access

Description

RESERVED

31:24

RO

RESERVED

RING VALUE

23:21

RO

Ring Value
The read index - write index , the fifo depth(4xbytes)

STATE

20:17

RU

State
I2C master engine state
0x1: START
0x2: SEND_SLAVE_ADDR
0x3: SEND_REG_ADDR
0x4: RECEIVE_ACK
0x5: SEND_ACK
0x6: WRITE_DATA
0x7: READ_DATA
0x8: RESTART
0x9: STOP
0x10: STOP2START_BUF

RESERVED

16

RO

RESERVED

PROBE MODE

15:12

RUW

Probe Mode
0x0: internal state
0x1: cpu data
0x2: reserved
0x3: reserved

RESERVED

11:9

RU

RESERVED

SIFBUSY

8

RU

Sif Busy
When I2C master engine active

RESERVED

7:0

RU

RESERVED


140.6 I2C Master Status 0 (i2cm status0)

Address: 0x9C004618
Reset: 0x0

Field Name

Bit

Access

Description

FIFO RCOUNTER

31:16

RO

I2C master read counter
Indicate how many fifo bytes

FIFO WCOUNTER

15:0

RO

I2C master write counter
Indicate how many fifo bytes


140.7 I2C Master Interrupt (interrupt)

Address: 0x9C00461C
Reset: 0x8


Field Name

Bit

Access

Description

RESERVED

31:21

RO

RESERVED

RINC INDEX

20:18

RO

I2C master ring fifo read index

WINC INDEX

17:15

RO

I2C master ring fifo write index

RESERVED

14:12

RO

RESERVED

SCL HOLD TOO LONG FLAG

11

RO

I2C scl bus hold low too long(I2C slave hold scl too long)

0: none(default)
1: occur

WFIFO ENABLE

10

RO

When I2C master ring fifo is not full,cpu can write 4 bytes data to fifo

0: none(default)
1: cpu can write data

FULL FLAG

9

RO

Monitor I2C master ring fifo full flag

0: none(default)
1: fifo full

EMPTY FLAG

8

RO

Monitor I2C master ring fifo empty and has error because not ready write data to i2c.

0: none(default)
1: fifo empty

SCL WAIT FLAG

7

RO

I2C scl bus wait (when I2C scl wait by I2C slave device)

0: none(default)
1: occur

EMPTY THRESHOLD FLAG

6

RU

FIFO Empty Threshold Flag 
When I2C master ring value(ring index - write index) >= empty threshold, default = 4 (sw control) ,one ring value = 4 bytes 
0: none(default)
1: occur

DATA NACK FLAG

5

RU

Monitor i2c slave, data NACK (when I2C master transm- mit)

0: none(default)
1: I2C slave,data NACK

ADDRESS NACK FLAG

4

RU

monitor i2c slave, slave address NACK (when I2C master transmmit)

0: none(default)
1: I2C slave,slave address NACK

BUSBUSY FLAG

3

RU

When I2C master engine is idle, monitor the I2C is idle or not

0: none(default)
1: I2C bus busy

CLKERR FLAG

2

RU

I2C master active , monitor scl input active error flag

0: none(default)
1: occur

DONE FLAG

1

RU

I2C master active done flag

0: none(default)
1: occur

SIFBUSY FLAG

0

RU

When I2C master engine active flag

0: none(default)
1: occur


140.8 I2C Master Interrupt Enable (int en0)

Address: 0x9C004620
Reset: 0x0000 0800


Field Name

Bit

Access

Description

RESERVED

31:14

RO

RESERVED

SCL HOLD TOO LONG INT EN

13

RW

I2C slave device hold scl low too long interrupt enable

0: disable(default)
1: enable

NACK INT EN

12

R/W

I2C master write transaction nack interrupt enable

0: disable(default)
1: enable

CTL EMPTY THRESHOLD

11:9

R/W

I2C master ring fifo empty threshold control(sw control)

EMPTY FLAG EN

8

R/W

I2C master ring fifo empty interrupt flag enable

0: disable(default)
1: enable

SCL WAIT INT EN

7

R/W

i2c slave device hold scl low interrupt enable

0: disable(default)
1: enable

EMPTY THRESHOLD EN

6

R/W

I2C master ring fifo empty threshold interrupt flag enable

0: disable(default)
1: enable

DATA NACK EN

5

R/W

I2C master write transaction nack interrupt enable

0: disable(default)
1: enable

ADDRESS NACK EN

4

R/W

I2C master write transaction slave address nack interrupt enable

0: disable(default)
1: enable

BUSY INT EN

3

R/W

i2c bus busy interrupt enable(when I2C master is idle)

0: disable(default)
1: enable

CLKERR INT EN

2

R/W

I2C master active , monitor scl input active error interrupt enable

0: disable(default)
1: enable

DONE INT EN

1

R/W

I2C master active done interrupt enable

0: disable(default)
1: enable

SIFBUSY EN

0

R/W

I2C master start to active interrupt enable

0: disable(default)
1: enable


140.9 I2C Master Mode Set (i2cm mode)

Address: 0x9C004624
Reset: 0x8050 8002

Field Name

Bit

Access

Description

ADDRESS NACK STOP

31

RW

When address nack happened,stop the i2c master or not

0:not stop i2c master
1:stop i2c master(default)

SCL HPERIOD

30:20

RW

SCL High Period Time,
total hold time is 111ns+(37*buf stop2start) ns

RESERVED

19

RO

RESERVED

BUFPERIOD

18:8

RW

The setting value for the restart bus wait time, total hold time is 111ns+(37xbuf stop2start)ns

RESERVED

7:6

RO

RESERVED

EN SET HPERIOD

5

RW

Enable the manual set the scl high period Time

0: disable(default)
1: enable

RESERVED

4:3

RO

RESERVED

I2C DMA MODE

2

RW

Select the DMA mode

0: ISP mode(default)
1: DMA mode

MANUAL MODE

1

RW

Select the original I2C master active mode (default is 1)

0: trigger mode
1: auto mode(default)

MANUAL TRIG

0

RW

Set the I2C master manual active when manual mode is trigger mode

0: none(default)
1: trigger


140.10 I2C Master Status 1 (i2cm status1)

Address: 0x9C004628
Reset: 0x0


Field Name

Bit

Access

Description

RESERVED

31:16

RO

RESERVED

BYTE COUNTER

15:0

RO

I2C master write,read counter status


140.11 I2C Master Status 2 (i2cm status2)

Address: 0x9C00462C
Reset: 0x1


Field Name

Bit

Access

Description

RESERVED

31:1

RO

RESERVED

SW RESET DONE

0

RO

SW RESET DONE status

0: SW RESET not DONE
1: SW RESET DONE(default)


140.12 I2C Master Control 6 (control6)

Address: 0x9C004630
Reset: 0x0

Field Name

Bit

Access

Description

I2CWRDATA CLR

31:0

W1C

I2C burst read ,clear the data buffer interrupt, write "1" to clear
0: none(default)
1: clear


140.13 I2C Master Interrupt Enable 1 (int en1)

Address: 0x9C004634
Reset: 0x0


Field Name

Bit

Access

Description

I2CRDATA EN

31:0

RW

I2C burst read interrupt enable

0: disable(default)
1: enable


140.14 I2C Master Status 3 (i2cm status3)

Address: 0x9C004638
Reset: 0x0


Field Name

Bit

Access

Description

I2CRDATA FLAG

31:0

RO

I2C burst read ,the data buffer status flag


140.15 I2C Master Status 4 (i2cm status4)

Address: 0x9C00463C
Reset: 0x0


Field Name

Bit

Access

Description

I2CRD FAIL FLAG

31:0

RO

I2C burst read ,the data buffer overflow


140.16 I2C Master Interrupt Enable 2 (int en2)

Address: 0x9C004640
Reset: 0x0


Field Name

Bit

Access

Description

I2CRD FAIL INT EN

31:0

RW

I2C burst read ,the data buffer overflow interrupt enable

0: disable(default)
1: enable


140.17 I2C Master Control 7 (control7)

Address: 0x9C004644
Reset: 0x0001 0001


Field Name

Bit

Access

Description

RDCOUNT

31:16

RW

Decide how many bytes to read

WRCOUNT

15:0

RW

Decide how many bytes to write


140.18 I2C Master Control 8 (control8)

Address: 0x9C004648
Reset: 0x6993 0005

Field Name

Bit

Access

Description

STRETCH BUFPERIOD

31:16

RW

Stretch Buffer Period
Time unit is 37ns. 
Set STRETCH_BUFPERIOD, it means after 37ns x STRETCH_BUFPERIOD will add one count to STRETCH_CNT.
It can not set zero.

RESERVED

15:12

RO

RESERVED

STRETCH TRYTIME

11:0

RW

Stretch count limit
If the stretch cnt > trytime, it will issue scl hold too long interrupt.
It can not set zero.


140.19 I2C Master Control 9 (control9)

Address: 0x9C00464C
Reset: 0x1


Field Name

Bit

BitAccess

Description

RESERVED

31:12

RO

RESERVED

STRETCH CNT

11:0

RO

Scl hold low time counter


140.20 Reserved (reserved2)

Address: 0x9C004650
Reset: 0x0


Field Name

Bit

BitAccess

Description

RESERVED2

31:24

RO

RESERVED2

RESERVED2

23:16

RO

RESERVED2

RESERVED2

15:8

RO

RESERVED2

RESERVED2

7:0

RO

RESERVED2


140.21 Reserved (reserved3)
Address: 0x9C004654
Reset: 0x0


Field Name

Bit

Access

Description

RESERVED3

31:24

RO

RESERVED3

RESERVED3

23:16

RO

RESERVED3

RESERVED3

15:8

RO

RESERVED3

RESERVED3

7:0

RO

RESERVED3


140.22 Reserved (reserved4)
Address: 0x9C004658 
Reset: 0x0


Field Name

Bit

Access

Description

RESERVED4

31:24

RO

RESERVED4

RESERVED4

23:16

RO

RESERVED4

RESERVED4

15:8

RO

RESERVED4

RESERVED4

7:0

RO

RESERVED4


140.23 VERSION (version)

Address: 0x9C00465C
Reset: 0x0181 1100


Field Name

Bit

Access

Description

ID VERSION

31:24

RO

id version

DATA VERSION

23:0

RO

data version


140.24 I2C Master SRAM DATA 0 to 3 (data00 03)
Address: 0x9C004660
Reset: 0x0


Field Name

Bit

Access

Description

DATA3

31:24

R/W

The data buffer3.

DATA2

23:16

R/W

The data buffer2.

DATA1

15:8

R/W

The data buffer1.

DATA0

7:0

R/W

The data buffer0.


140.25 I2C Master SRAM DATA 4 to 7 (data04 07)
Address: 0x9C004664
Reset: 0x0


Field Name

Bit

Access

Description

DATA7

31:24

R/W

The data buffer7.

DATA6

23:16

R/W

The data buffer6.

DATA5

15:8

R/W

The data buffer5.

DATA4

7:0

R/W

The data buffer4.


140.26 I2C Master SRAM DATA 8 to 11 (data08 11)

Address: 0x9C004668
Reset: 0x0

Field Name

Bit

Access

Description

DATA11

31:24

R/W

The data buffer11.

DATA10

23:16

R/W

The data buffer10.

DATA9

15:8

R/W

The data buffer9.

DATA8

7:0

R/W

The data buffer8.


140.27 I2C Master SRAM DATA 12 to 15 (data12 15)

Address: 0x9C00466C
Reset: 0x0

Field Name

Bit

Access

Description

DATA15

31:24

RW

The data buffer15.

DATA14

23:16

RW

The data buffer14.

DATA13

15:8

RW

The data buffer13.

DATA12

7:0

RW

The data buffer12.


140.28 I2C Master SRAM DATA 16 to 19 (data16 19)

Address: 0x9C004670
Reset: 0x0

Field Name

Bit

Access

Description

DATA19

31:24

RW

The data buffer19.

DATA18

23:16

RW

The data buffer18.

DATA17

15:8

RW

The data buffer17.

DATA16

7:0

RW

The data buffer16.


140.29 I2C Master SRAM DATA 20 to 23 (data20 23)
Address: 0x9C004674
Reset: 0x0


Field Name

Bit

Access

Description

DATA23

31:24

R/W

The data buffer23.

DATA22

23:16

R/W

The data buffer22.

DATA21

15:8

R/W

The data buffer21.

DATA20

7:0

R/W

The data buffer20.


140.30 I2C Master SRAM DATA 24 to 27 (data24 27)
Address: 0x9C004678 
Reset: 0x0


Field Name

Bit

Access

Description

DATA27

31:24

R/W

The data buffer27.

DATA26

23:16

R/W

The data buffer26.

DATA25

15:8

R/W

The data buffer25.

DATA24

7:0

R/W

The data buffer24.


140.31 I2C Master SRAM DATA 28 to 31 (data28 31)

Address: 0x9C00467C
Reset: 0x0

Field Name

Bit

Access

Description

DATA31

31:24

RW

The data buffer31.

DATA30

23:16

RW

The data buffer30.

DATA29

15:8

RW

The data buffer29.

DATA28

7:0

RW

The data buffer28.




RGST Table Group 141 GDMA0: General DMA 0


141.0 DMA HW VER (dma hw ver)

Address: 0x9C004680
Reset: 0x018A1100

Field Name

Bit

Access

Description

DMA HW VER

31:0

RO

Hardware Version

A constant, usually stands for h/w delivery date, such as32'h01791000


141.1 DMA CONFIG (dma config)
Address: 0x9C004684
Reset: 0x00000004

Field Name

Bit

Access

Description

Reserved

31:9

RO

RESERVED

DMA GO

8

RUW

DMA GO Signal

Write 1 to trigger DMA hardware, self clear to zero when current operation has been finished.

Reserved

7:3

RO

RESERVED

NON BUF MODE

2

RW

GDMA write command bufferable

0x0: all write command is bufferable
0x1: all write command is non-buffer(default) Valid when DMA GO is set to 1, and can not be changed when DMA GO assert.

SAME SLAVE

1

RW

GDMA access same slave

0x0: access different slave in SG mode(like CBDMA & DRAM at same time)(default)
0x1: access same slave in SG mode Valid when DMA GO is set to 1, and can not be changed when DMA GO assert.

DMA MODE

0

RW

Set DMA Mode
0x0: DMA READ (read data from main memory to internal SRAM)(default)
0x1: DMA WRITE (write data from internal SRAM to main memory)
Valid when DMA GO is set to 1, and can not be changed when DMA GO assert.


141.2 DMA LENGTH (dma length)

Address: 0x9C004688
Reset: 0x00000000

Field Name

Bit

Access

Description

Reserved

31:25

RO

RESERVED

DMA LENGTH

24:0

RW

Set DMA Length
DMA read and write function support length.I2C only support 3 bytes to 64Kbytes, and do not care 24:16 bits
Valid when DMA GO is set to 1, and can not be changed when DMA GO assert.


141.3 DMA ADR (dma adr)

Address: 0x9C00468C
Reset: 0x00000000


Field Name

Bit

Access

Description

DMA SRC ADR

31:0

RW

DMA Source Address

• DMA WRITE: indicate write to which main memory address • DMA READ: indicate read from which main mem- ory address Valid when DMA GO is set to 1, and can not be changed when DMA GO assert.


141.4 DMA PORT MUX (port mux)

Address: 0x9C004690
Reset: 0x00000000

Field Name

Bit

Access

Description

Reserved

31:1

RO

RESERVED

PORT MUX

0

RW

PORT MUX

use to select PORT,ex. UART0,UART1.


141.5 INT FLAG (int flag)

Address: 0x9C004694
Reset: 0x00000000

Field Name

Bit

Access

Description

Reserved

31:7

RO

RESERVED

LENGTH0 REG

6

WO

Length is zero flag

• In SG MODE, if LLI RUN INDEX length is zero, theLENGTH0 REG will be 1
• In Normal MODE, if length iszero,theLENGTH0 REG will be 1

THRESHOLD REG

5

WO

Threshold flag

• In SG MODE: when RUN LLI INDEX = THRESH- OLD LLI INDEX and NUM = THRESH- OLD NUM,the interrupt will occurs

• In Normal MODE: when NUM = THRESH- OLD NUM,the interrupt will occurs

IP TIMEOUT REG

4

WO

Peripheral IP Timeout

When GDMA wait Peripheral IP too long will set HIGH,depend on IP TIMEOUT DEF WRITE and IP TIMEOUT DEF READ

GDMA TIMEOUT REG

3

W1C

GDMA Timeout

When Peripheral IP wait GDMA too long will HIGH,depend on GDMA TIMEOUT DEF WRITE GDMA TIMEOUT DEF READ

W BYTE EN ERROR REG

2

W1C

Peripheral IP WRITE BYTE EN errorflag

WRITE BYTE EN not meet the protocol.

WRITE CNT

1

W1C

Peripheral IP DATA CNT error flag

Date Count error

DMA DONE FLAG

0

W1C

DMA Done

If DMA done will assert this flag, write 1 clear


141.6 DMA INT EN (dma int en)
Address: 0x9C004698
Reset: 0x00000000

Field Name

Bit

Access

Description

Reserved

31:8

RO

RESERVED

DMA IDLE EN

7

RW

DMA IDLE Interrupt Enable

Write 1 to enable DMA IDLE interrupt function.

LENGTH0 EN

6

RW

LENGTH0 Interrupt Enable

Write 1 to enable LENGTH0 interrupt function.

THRESHOLD EN

5

RW

THRESHOLD Interrupt Enable

Write 1 to enable THRESHOLD interrupt function.

IP TIMEOUT EN

4

RW

IP TIMEOUT Interrupt Enable

Write 1 to enable IP TIMEOUT interrupt function.

GDMA TIMEOUT EN

3

RW

GDMA TIMEOUT Interrupt Enable

Write 1 to enable GDMA TIMEOUT interrupt function.

W BYTE EN ERROR EN

2

RW

Write Byte ERROR Interrupt Enable

Write 1 to enable WRITE BYTE ENABLE ERROR inter- rupt function

WRITE CNT ERROR EN

1

RW

Write CNT ERROR Interrupt Enable

Write 1 to enable WRITE CNT ERROR interrupt function

DMA DONE EN

0

RW

DMA Done Interrupt Enable

Write 1 to enable DMA DONE interrupt function, default is enable


141.7 SW RESET STATE (software reset state)

Address: 0x9C00469C
Reset: 0x00000001


Field Name

Bit

Access

Description

Reserved

31:2

RO

RESERVED

SW RESET REG

1

RW

set Software Reset

write 1 to set Software Reset

SW RESET DONE

0

RO

identify SW RESET state

0x0: resetting,need wait SW RESET DONE to be HIGH

0x1: reset done,ready for SW RESET


141.8 Reserved (reserved)

Address: 0x9C0046A0
Reset: 0x00000000

Field Name

Bit

Access

Description

Reserved

31:0

RO

RESERVED


141.9 Reserved (reserved)

Address: 0x9C0046A4
Reset: 0x00000000

Field Name

Bit

Access

Description

Reserved

31:0

RO

RESERVED


141.10 SG DMA INDEX (sg dma index)

Address: 0x9C0046A8
Reset: 0x00000000

Field Name

Bit

Access

Description

Reserved

31:13

RO

RESERVED

SG LLI RUN INDEX

12:8

RW

The start LLI index in a task
If the task stop cause error occur, SG LLI RUN INDEX will indicate which LLI fail.

Reserved

7:5

RO

RESERVED

SG LLI ACCESS INDEX

4:0

RW

Index for LLI access

Determine which LLI mapping to REG 0x0B 0x0F


141.11 SG DMA CONFIG (sg dma config)
Address: 0x9C0046AC
Reset: 0x00000000


Field Name

Bit

Access

Description

Reserved

31:3

RO

RESERVED

SG LAST LLI IN TASK

2

RW

Last LLI in a task flag for LLI

0x0:when this LLI finish, execute next LLI (default)
0x1:when this LLI finish, SGDMA stop

Reserved

1

RO

RESERVED

DMA MODE

0

RW

Set DMA Mode for LLI

0x0: DMA WRITE (write data from Peripheral IP to main memory)
0x1: DMA READ (read data from main memory to Periph- eral IP)


141.12 SG DMA LENGTH (sg dma length)

Address: 0x9C0046B0
Reset: 0x00000000

Field Name

Bit

Access

Description

Reserved

31:25

RW

RESERVED

SG DMA LENGTH

24:0

RW

Set DMA Length for LLI
DMA read and write function support length from 1bytes to 64Kbytes.
Valid when DMA GO is set to 1, and can not be changed when DMA GO assert.


141.13 SG DMA ADR (sg dma adr)

Address: 0x9C0046B4
Reset: 0x00000000

Field Name

Bit

Access

Description

SG DMA ADR

31:0

RW

DMA Address for LLI

Valid when DMA GO is set to 1, and can not be changed when DMA GO assert.


141.14 reserve (reserve)

Address:0x9C0046B8
Reset:0x00000000

Field Name

Bit

Access

Description

Reserved

31:0

RO

RESERVED


141.15 SG SETTING (sg setting)
Address: 0x9C0046BC
Reset: 0x00000000


Field Name

Bit

Access

Description

SG DMA ENABLE

31

RW

SG DMA ENABLE

set SG DMA enable for LLI.

RSV0

30:1

RO

RESERVED

SG DMA GO

0

RUW

SG DMA GO

set SG DMA GO enable for LLI.


141.16 THRESHOLD (threshold parameter)

Address: 0x9C0046C0
Reset: 0x00000040

Field Name

Bit

Access

Description

THRESHOLD LLI INDEX

31:27

RW

THRESHOLD LLI INDEX

determine the LLI index to trigger THRESHOLD INTERRUPT

Reserved

26:25

RO

RESERVED

THRESHOLD LEN

24:0

REW

THRESHOLD LENGTH

determine the length to trigger THRESHOLD INTERRUPT.


141.17 reserve (reserve)

Address:0x9C0046C4
Reset:0x00000000

Field Name

Bit

Access

Description

Reserved

31:0

RO

RESERVED


141.18 GDMA READ TIMEOUT (GDMA READ setting)

Address: 0x9C0046C8
Reset: 0x0010 0000

Field Name

Bit

Access

Description

GDMA READ TIMEOUT

31:0

RW

GDMA READ TIMEOUT DEFINE

define GDMA READ TIMEOUT counter, can not set 0. only can set when DMA GO IP=0


141.19 GDMA WRITE TIMEOUT (GDMA WRITE setting)

Address: 0x9C0046CC
Reset: 0x0010 0000


Field Name

Bit

Access

Description

GDMA WRITE TIMEOUT

31:0

RW

GDMA WRITE TIMEOUT DEFINE

define GDMA WRITE TIMEOUT counter, can not set 0. only can set when DMA GO IP=0


141.20 IP READ TIMEOUT (IP READ TIMEOUT setting)

Address: 0x9C0046D0
Reset: 0x0010 0000

Field Name

Bit

Access

Description

IP READ TIMEOUT

31:0

RW

IP READ TIMEOUT DEFINE

define IP READ TIMEOUT counter, can not set 0. only can set when DMA GO IP=0


141.21 IP WRITE TIMEOUT (IP WRITE TIMEOUT setting)

Address: 0x9C0046D4
Reset: 0x0010 0000

Field Name

Bit

Access

Description

IP WRITE TIMEOUT

31:0

RW

IP WRITE TIMEOUT DEFINE

define IP WRITE TIMEOUT counter, can not set 0. only can set when DMA GO IP=0


141.22 Reserved (reserved)

Address: 0x9C0046D8
Reset: 0x00000000

Field Name

Bit

Access

Description

Reserved

31:0

RO

Reserved for Internal usage purpose


141.23 Reserved (Reserved)

Address: 0x9C0046DC
Reset: 0x00000000


Field Name

Bit

Access

Description

Reserved

31:0

RO

Reserved for Internal usage purpose


141.24 WRITE DATA SLICE EMPTY (Write Data Slice Empty)

Address: 0x9C0046E0
Reset: 0x40000000

Field Name

Bit

Access

Description

Reserved

31

RO

RESERVED

W SLICE EMPTY

30

RO

Write Data Slice Empty or not

0x0: Write Data Slice not Empty
0x1: Write Data Slice Empty

Reserved

29:0

RO

Reserved for Internal usage purpose


141.25 READ DATA SLICE EMPTY (Read Data Slice Empty)

Address:0x9C0046E4
Reset:0x40000000

Field Name

Bit

Access

Description

Reserved

31

RO

RESERVED

R SLICE EMPTY

30

RO

Read Data Slice Empty or not

0x0: Read Data Slice not Empty
0x1: Read Data Slice Empty

Reserved

29:0

RO

Reserved for Internal usage purpose



RGST Table Group 142 I2C Master1 (Base Address: 0x9C004700, Please refer to I2C MASTER0 register offset and description for more detail)
RGST Table Group 143 GDMA1 (Base Address: 0x9C004780, Please refer to I2C GDMA0 register offset and description for more detail)
RGST Table Group 144 I2C Master2 (Base Address: 0x9C004800, Please refer to I2C MASTER0 register offset and description for more detail)
RGST Table Group 145 GDMA2 (Base Address: 0x9C004880, Please refer to I2C GDMA0 register offset and description for more detail)
RGST Table Group 146 I2C Master3 (Base Address: 0x9C004900, Please refer to I2C MASTER0 register offset and description for more detail)
RGST Table Group 147 GDMA3 (Base Address: 0x9C004980, Please refer to I2C GDMA0 register offset and description for more detail)