CHAPTER 19: Programmable CRC
FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E 943
4.3 CRC Computing Initial Value Register
CRC computing initial value register (PRGCRC_SEED) specifies the initial values for CRC computing.
Register configuration
Register functions
[bit31:0] PRGCRC_SEED (CRC Seed value)
Set the initial values for new CRC computing. Discards the computing results is stored in LFSR.
Reads the register setting value.
To start new CRC computing, be sure to set the initial values of CRC computing. By performing write
access to this register, the initial values is set to LFSR of Figure 2-1. Also, the computing results stored in
LFSR are discarded.
The write value of this register is not influenced by the format conversion specifications
(PRGCRC_CFG.FI[1:0] and FO[1:0]) of computing input/output data. Specify the value stored in LFSR
as-is. Specify the value for CRC length from by left justified. If the CRC length is less than 32, padding
with "0" for the right side unused section. Table 4-3 shows an example setting of CRC length and the
PRGCRC_SEED register.
Table 4-3 Example setting values of PRGCRC_SEED
PRGCRC_SEED setting value
(when all initial values for CRC are "1")
PRGCRC_SEED setting value
(when all initial values for CRC are "0")
Write access to this register is not allowed when CRC computing is performed
(PRGCRC_CFG.LOCK="1").
Notes:
− To perform write access to this register, always perform with 32-bit width write access (word
access).
− Since the format conversion of computing input/output data is not applied to the setting values of
this register, be sure to set the values after format conversion if starting CRC computing by using
any values other than the initial values shown in Table 4-3.
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