Cypress FM4 Series - Configuration and Operation of the Programmable CRC; Configuration of the Programmable CRC

CHAPTER 19: Programmable CRC
FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E 933
2. Configuration and Operation of the Programmable CRC
2.1 Configuration of the Programmable CRC
Figure 2-1shows the block diagram of the programmable CRC.
Figure 2-1 Block Diagram of the Programmable CRC
Table 2-1shows overview of the programmable CRC control register functions.
Table 2-1 Programmable CRC Control Register Functions
Abbreviated Register Name
Function Overview
PRGCRC_CFG
Sets operation mode of CRC computing circuit and performs operation status check.
PRGCRC_POLY
Sets generator polynomial for CRC computing before computing starts.
PRGCRC_SEED
Sets the initial values (SEED value) for CRC computing before computing starts.
PRGCRC_FXOR
Sets the value operated with bitwise XOR for final results of CRC computing before computing
starts.
PRGCRC_WR
Writes the input data of CRC computing from CPU.
PRGCRC_RD
Reads the output results of CRC computing from CPU.
PRGCRC_WR[31:0] reg.
・・・
Input format conversion block
PRGCRC_POLY[31:0] reg.
LFSR
・・・
PRGCRC_SEED[31:0] reg.
PRGCRC_CFG. SZ[1:0] reg.
PRGCRC_CFG. FI[1:0] reg.
Output format conversion block
PRGCRC_FXOR[31:0] reg.
・・・
PRGCRC_RD[31:0] reg.
Write input data from CPU
Read output data to CPU
PRGCRC_CFG.FO[1:0] reg.
Input data
to LFSR
Output data
from LFSR