CHAPTER 25:Programmable CRC
S6J3200 Series Hardware Manual Document Number: 002-04852 Rev. *G
963
Table 3-1 Preliminary Input Data Bit-wise and/or Byte-wise Reflection/Swapping
RIBYT
RIBIT
SZ
Final Input Data for CRC Engine
+3
+2
+1
+0
0
0
00
XXXX XXXX
XXXX XXXX
XXXX XXXX
D7------- D0
01
XXXX XXXX
XXXX XXXX
C7--------C0
D7--------D0
10
XXXX XXXX
B7--------B0
C7--------C0
D7--------D0
11
A7--------A0
B7--------B0
C7--------C0
D7--------D0
1
00
XXXX XXXX
XXXX XXXX
XXXX XXXX
D0--------D7
01
XXXX XXXX
XXXX XXXX
C0--------C7
D0--------D7
10
XXXX XXXX
B0--------B7
C0--------C7
D0--------D7
11
A0---------A7
B0--------B7
C0--------C7
D0--------D7
1
0
00
XXXX XXXX
XXXX XXXX
XXXX XXXX
D7--------D0
01
XXXX XXXX
XXXX XXXX
D7--------D0
C7--------C0
10
XXXX XXXX
D7--------D0
C7--------C0
B7--------B0
11
D7---------D0
C7--------C0
B7--------B0
A7--------A0
1
00
XXXX XXXX
XXXX XXXX
XXXX XXXX
D0--------D7
01
XXXX XXXX
XXXX XXXX
D0--------D7
C0--------C7
10
XXXX XXXX
D0--------D7
C0--------C7
B0--------B7
11
D0---------D7
C0--------C7
B0--------B7
A0--------A7
3. The "preliminary input data" after applying the settings of CRCn_CFG:RIBIT/RIBYT results in the "final
input data", which is sent to the CRC engine for checksum calculation.
4. The CRCn_SEED register provides the initial value to the CRC engine. The required polynomial is
provided by CRCn_POLY register. The CRC engine starts its operation once CRCn_WR register is
written with the input data.
5. CRC engine performance: The performance of CRC engine for CRC checksum calculation is based on
the input data size and number of clock cycles (bus clock) required to complete a calculation. The
shows number of clock cycles required to get final checksum at CRCn_RD register with respect to input
data size.
Table 3-2 Clock Cycles Requirement for Checksum Calculation
Input Data Size
Number of Clock Cycles Required for Final Checksum at CRCn_RD
8-bit
Input data size (8-bit) + 2 = 10 clock cycles.
16-bit
Input data size (16-bit) + 2 = 18 clock cycles.
24-bit
Input data size (24-bit) + 2 = 26 clock cycles.
32-bit
Input data size (32-bit) + 2 = 34 clock cycles.
6. The "preliminary checksum #1" bytes can be swapped/reflected bit-wise using CRCn_CFG:ROBIT
and/or byte-wise using CRCn_CFG:ROBYT. shows at which positions the checksum bits of
"preliminary checksum #1" S[(LEN-1):0] will be located in "preliminary checksum #2" after
CRCn_CFG:ROBIT/ROBYT settings have been applied. Only some examples of different
CRCn_CFG:LEN configurations are shown.
Note:
−
Only some examples for CRCn_CFG:LEN are shown.
Содержание S6J3200 Series
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