25.9.5 DMA CRC Polynomial B Register
Symbol | Description | Symbol | Description | Symbol | Description |
---|---|---|---|---|---|
R | Readable bit | HC | Cleared by Hardware | (Grey cell) | Unimplemented |
W | Writable bit | HS | Set by Hardware | X | Bit is unknown at Reset |
K | Write to clear | S | Software settable bit | — | — |
Name: | CRCPOLYB |
Offset: | 0x10 |
Reset: | 0x00000000 |
Property: | PAC Write-Protection, Enable Write Protected |
Bit | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | |
POLYB[31:24] | |||||||||
Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Bit | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | |
POLYB[23:16] | |||||||||
Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Bit | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | |
POLYB[15:8] | |||||||||
Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
POLYB[7:0] | |||||||||
Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Bits 31:0 – POLYB[31:0] CRC Polynomial Coefficients B Bits
The most significant polynomial term is always included in the CRC polynomial and is not required to be programmed in this register. This includes x32 for a 32-bit polynomial and x16 for a 16-bit polynomial.
For example, set this register to 0x741B8CD7 for the following 32-bit polynomial:
p(x) = x32 + x30 + x29 + x28 + x26 + x20 + x19 + x17 + x16 + x15 + x11 + x10 + x7 + x6 + x4 + x2 + x + 1
Set this register to 0x00000589 for the following 16-bit polynomial p(x) = x16 + x10 + x8 + x7 + x3 + 1
Value | Description |
---|---|
0 | Exclude xnfrom the CRC polynomial. |
1 | Include the term xn, where n is the bit location, in the CRC polynomial. |