Case download:
uart_apb.zip
1 Design Brief
UART is short for Universal Asynchronous Receiver and Transmitter. Used for communication between serial input and serial output devices. Serial transmission comes at the cost of speed, in exchange for a reduction in cost and complexity of wiring. UART provides synchronization of serial asynchronous received data, parallel-to-serial and serial-to-parallel data conversion of the transmitter and receiver, for digital systems that need to convert serial data streams to parallel data, these functions Is essential. Synchronization of the serial data stream is achieved by adding start and stop bits to the transmitted data to form a data character. Data integrity is achieved by appending a parity bit to the data character, which is provided by the receiver Check this parity bit to check whether there is any transmission bit error. It is mainly composed of data bus interface, control logic, baud rate generator, sending part and receiving part.
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The UART controller IP core design is the AMBA APB slave bus interface, and our FBIO Wrapper is the AMBA AXI bus interface, which cannot be directly connected together, and requires an AXI2ABP Bridge to connect;
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, We choose apb_ bus_ m32_bridge module from Bus Bridge series, it provides APB master bus interface to connect our IP,as shown in the figure below;
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This experiment uses the FPGA daughter board supporting the Plus1 7021 SP7021 SOC practice platform to complete the relevant experiment. The experiment is carried out in loopback mode, which is to connect the TX and RX of the UART controller IP core design; The development tool of FPGA daughter board uses XILINX's Vivado integrated development environment (version number is 2018.3); in order to facilitate the connection of the user's own verification IP to the SOC system for verification, this experiment provides the corresponding design reference basic files, as follows
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The corresponding connection between the design case and the pin connection of the SP7021 motherboard and FPGA daughter board is shown in the following table: 1: U20B on the main board is connected to J2 of the FPGA daughter board (Pin pin corresponding, such as 1-51 ...), providing the data transmission channel between the Plus1 main chip on the main board and the FPGA
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