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RM0351 Cyclic redundancy check calculation unit (CRC)
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13.4.4 Initial CRC value (CRC_INIT)
Address offset: 0x10
Reset value: 0xFFFF FFFF
13.4.5 CRC polynomial (CRC_POL)
Address offset: 0x14
Reset value: 0x04C11DB7
Bits 4:3 POLYSIZE[1:0]: Polynomial size
These bits control the size of the polynomial.
00: 32 bit polynomial
01: 16 bit polynomial
10: 8 bit polynomial
11: 7 bit polynomial
Bits 2:1 Reserved, must be kept cleared.
Bit 0 RESET: RESET bit
This bit is set by software to reset the CRC calculation unit and set the data register to the value
stored in the CRC_INIT register. This bit can only be set, it is automatically cleared by hardware
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
CRC_INIT[31:16]
rw
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
CRC_INIT[15:0]
rw
Bits 31:0 CRC_INIT: Programmable initial CRC value
This register is used to write the CRC initial value.
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
POL[31:16]
rw
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
POL[15:0]
rw
Bits 31:0 POL[31:0]: Programmable polynomial
This register is used to write the coefficients of the polynomial to be used for CRC calculation.
If the polynomial size is less than 32-bits, the least significant bits have to be used to program the
correct value.
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