參數(shù)資料
型號(hào): 73M2910L
廠商: Electronic Theatre Controls, Inc.
英文描述: Microcontroller
中文描述: 微控制器
文件頁數(shù): 23/35頁
文件大?。?/td> 572K
代理商: 73M2910L
73M2910L
Microcontroller
23
FIGURE 4: CRC 16
CRC 16
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 0s. The bits are shifted in and operated on by the generating
polynomial, X
16
+ X
12
+ X
5
+ 1. During CRC transmission, the bytes in the CRC generating logic are
transmitted, high order bit first.
The receiver also initializes its CRC computation logic to all ones after the beginning flag. Its polynomial
generator (also X
16
+ X
12
+ X
5
+ 1) 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 1111 0000 1011 1000 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.
RESET (option to set)
COMPUTE
DATA
AND2
C
8
C
1
C
2
C
3
C
4
C
5
C
6
C
7
C
8
C
9
C
10
C
11
C
12
C
13
C
14
C
15
MUX
OUT
CRC 16 X
16
+ X
15
+ X
2
+ 1
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