Cypress FM4 Series - CRC Computing Output Data Register

CHAPTER 19: Programmable CRC
950 FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E
4.7 CRC Computing Output Data Register
The CRC computing output data register (PRGCRC_RD) reads the output data of CRC computing.
Register configuration
Address: +0x14
bit 31 0
Field
PRGCRC_RD[31:0]
Attribute
R/W
Initial value
0x 0000 0000
Register functions
[bit31:0] PRGCRC_RD (CRC output read data)
Access
Application
Write
Can write values from CPU for test purposes. The write values have no effect in CRC computing.
Read
Reads the CRC computing results (or CPU write values).
The output format conversion is performed for the computing results when CRC computing completed,
and then the PRGCRC_FXOR value operated with bitwise XOR will be stored in this register.
Table 4-6 shows the format conversion operation of output data. It shows the relationship between the
byte/bit position of this register and order for outputting from LFSR. The * mark indicates the section
exceeding the CRC length. When the PRGCRC_FXOR value is "0", "0" is read.
Table 4-6 Output format conversion
CRC
length
FO
[1:0]
PRGCRC_RD register read value
Address +3
Bit[31:24]
Address +2
Bit[23:16]
Address +1
Bit[15:8]
Address +0
Bit[7:0]
32
00
1,2,3,4,5,6,7,8
9,10,11,12,13,14,15,16
17,18,19,20,21,22,23,24
25,26,27,28,29,30,31,32
01
25,26,27,28,29,30,31,32
17,18,19,20,21,22,23,24
9,10,11,12,13,14,15,16
1,2,3,4,5,6,7,8
10
8,7,6,5,4,3,2,1
16,15,14,13,12,11,10,9
24,23,22,21,20,19,18,17
32,31,30,29,28,27,26,25
11
32,31,30,29,28,27,26,25
24,23,22,21,20,19,18,17
16,15,14,13,12,11,10,9
8,7,6,5,4,3,2,1
21
00
1,2,3,4,5,6,7,8
9,10,11,12,13,14,15,16
17,18,19,20,21,*,*,*
*,*,*,*,*,*,*,*
01
*,*,*,*,*,*,*,*
17,18,19,20,21,*,*,*
9,10,11,12,13,14,15,16
1,2,3,4,5,6,7,8
10
8,7,6,5,4,3,2,1
16,15,14,13,12,11,10,9
*,*,*,21,20,19,18,17
*,*,*,*,*,*,*,*
11
*,*,*,*,*,*,*,*
*,*,*,21,20,19,18,17
16,15,14,13,12,11,10,9
8,7,6,5,4,3,2,1
16
00
1,2,3,4,5,6,7,8
9,10,11,12,13,14,15,16
*,*,*,*,*,*,*,*
*,*,*,*,*,*,*,*
01
*,*,*,*,*,*,*,*
*,*,*,*,*,*,*,*
9,10,11,12,13,14,15,16
1,2,3,4,5,6,7,8
10
8,7,6,5,4,3,2,1
16,15,14,13,12,11,10,9
*,*,*,*,*,*,*,*
*,*,*,*,*,*,*,*
11
*,*,*,*,*,*,*,*
*,*,*,*,*,*,*,*
16,15,14,13,12,11,10,9
8,7,6,5,4,3,2,1
5
00
1,2,3,4,5,*,*,*
*,*,*,*,*,*,*,*
*,*,*,*,*,*,*,*
*,*,*,*,*,*,*,*
01
*,*,*,*,*,*,*,*
*,*,*,*,*,*,*,*
*,*,*,*,*,*,*,*
1,2,3,4,5,*,*,*
10
*,*,*,5,4,3,2,1
*,*,*,*,*,*,*,*
*,*,*,*,*,*,*,*
*,*,*,*,*,*,*,*
11
*,*,*,*,*,*,*,*
*,*,*,*,*,*,*,*
*,*,*,*,*,*,*,*
*,*,*,5,4,3,2,1
1
00
1,*,*,*,*,*,*,*
*,*,*,*,*,*,*,*
*,*,*,*,*,*,*,*
*,*,*,*,*,*,*,*
01
*,*,*,*,*,*,*,*
*,*,*,*,*,*,*,*
*,*,*,*,*,*,*,*
1,*,*,*,*,*,*,*
10
*,*,*,*,*,*,*,1
*,*,*,*,*,*,*,*
*,*,*,*,*,*,*,*
*,*,*,*,*,*,*,*
11
*,*,*,*,*,*,*,*
*,*,*,*,*,*,*,*
*,*,*,*,*,*,*,*
*,*,*,*,*,*,*,1