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A generalized hardware block diagram of BCH is shown in Figure 22-21.
Figure 22-2 1 BCH Hardware Block Diagram
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Table 22-1 shows the relationship of ECC data spec, Parity data length and Protect software use byte.
Table 22-1 ECC Data Format
"1KB/60bit" means the correct ability is 60bit within 1K byte date, "1KB/40bit" means the correct ability is 40bit within 1K byte date and so on.
The sum of the parity and SW protected data must be 4-byte align. The figure 22-3 2 is the example of ECC spec. as 1K/16b and software protected byte as 4 bytes case.
Figure 22-3 2 Software Protect Date Size
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There are two kinds of interrupt.
Decode fail Interrupt is issued when bch can't fix data because too much error bits happens and Decode fail mask is true. Finish interrupt is issued when bch work finish and Finish mask is true.
Figure 22-4 3 shows the BCH interrupt tree.
Figure 22-4 3 BCH Interrupt Tree
22.5 Registers Map
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