參數(shù)資料
型號: 73M2910L-IG
英文描述: Microcontroller
中文描述: 微控制器
文件頁數(shù): 24/41頁
文件大小: 509K
代理商: 73M2910L-IG
73M2910L
Microcontroller
CRC GENERATION
(continued)
24
FIGURE 5: 32-BIT CRC
CRC 32
The CRC check field is generated by the transmitter. The computation starts with the first transmitted bit after
the opening flag and stops at the last data bit prior to the frame check sequence bytes, and excludes inserted
0s. The CRC generating logic is initialized to all ones. The bits are shifted in and operated on by the
generating polynomial, X
32
+ X
26
+ X
23
+ X
22
+ X
16
+ X
12
+ X
11
+ X
10
+ X
8
+ X
7
+ X
5
+ X
4
+ X
2
+ X + 1. During
CRC transmission, the bytes in the CRC generating logic are inverted and transmitted, high order bit first. The
receiver also initializes its CRC computation logic to all ones after the beginning flag. Its polynomial generator
should see the same value as the transmitter’s polynomial generator as the last data bit is received. Note the
receiver’s polynomial generator does not process inserted 0s. After the bytes are received in the frame check
sequence, a remainder of 1101 1110 1011 1011 0010 0000 1110 0011 (X
0
through X
32
, respectively) should
be detected in the receiver’s polynomial generator. If this is not the case, it is assumed that the preceding
frame was in error and an invalid CRC is declared.
SET
COMPUTE
DATA
AND2
C
0
C
1
C
2
C
3
C
4
C
5
C
6
C
16
C
15
C
14
C
13
C
12
C
11
C
10
C
9
C
8
C
7
C
17
C
18
C
19
C
20
C
21
C
22
C
23
C
24
C
25
C
26
C
27
C
28
C
29
C
30
C
31
MUX
OUT
CRC Polynomial X
32
+ X
26
+ X
23
+ X
22
+ X
16
+ X
12
+ X
11
+ X
10
+ X
8
+ X
7
+ X
5
+ X
4
+ X
2
+ X
+ 1
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