Cypress S6J3200 Series, Manual

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CHAPTER 25:Programmable CRC
S6J3200 Series Hardware Manual Document Number: 002-04852 Rev. *G 967
4.1.
CRC Polynomial Register (CRCn_POLY)
The CRC Polynomial Register (CRCn_POLY) defines the polynomial value for the CRC checksum
calculation.
CRC Polynomial Register (CRCn_POLY)
BIT_OFFSET 31 30 29 28 27 26 25 24
BIT_NAME POLY[31] POLY[30] POLY[29] POLY[28] POLY[27] POLY[26] POLY[25] POLY[24]
ACCESS_TYPE R/W R/W R/W R/W R/W R/W R/W R/W
PROT_TYPE Rp/Wp
INITIAL_VALUE 0 0 0 0 0 1 0 0
BIT_OFFSET 23 22 21 20 19 18 17 16
BIT_NAME POLY[23] POLY[22] POLY[21] POLY[20] POLY[19] POLY[18] POLY[17] POLY[16]
ACCESS_TYPE R/W R/W R/W R/W R/W R/W R/W R/W
PROT_TYPE Rp/Wp
INITIAL_VALUE 1 1 0 0 0 0 0 1
BIT_OFFSET 15 14 13 12 11 10 9 8
BIT_NAME POLY[15] POLY[14] POLY[13] POLY[12] POLY[11] POLY[10] POLY[9] POLY[8]
ACCESS_TYPE R/W R/W R/W R/W R/W R/W R/W R/W
PROT_TYPE Rp/Wp
INITIAL_VALUE 0 0 0 1 1 1 0 1
BIT_OFFSET 7 6 5 4 3 2 1 0
BIT_NAME POLY[7] POLY[6] POLY[5] POLY[4] POLY[3] POLY[2] POLY[1] POLY[0]
ACCESS_TYPE R/W R/W R/W R/W R/W R/W R/W R/W
PROT_TYPE Rp/Wp
INITIAL_VALUE 1 0 1 1 0 1 1 1
[bit31:0] POLY[31:0] : CRC Polynomial
The CRCn_POLY contains the CRC polynomial. The degree of the polynomial must be between 2 to 32.
Initial value is the common CRC-32 polynomial 0x04C11DB7 (x32 + x26 + x23 + x22 + x16 + x12 + x11 +
x10 + x8 + x7 + x5 + x4 + x2 + x + 1). The highest degree of coefficient should be used to configure
polynomial/checksum length (CRCn_CFG:LEN).
Note:
−
If the polynomial length as defined by CRCn_CFG:LEN is less than 32-bit, then the upper bits
[31:LEN] must be written to "0" by the programmer. The highest order degree must not be set to
"1" while configuring CRCn_POLY register, as it is implicitly defined by CRCn_CFG:LEN.