M16CSLASH29 datasheet(339/499 Pages) RENESAS

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18. CRC Calculation Circuit

page 315

Figure 18.3. CRC Calculation

(1) Setting 000016 (initial value)

b15

1 0001 0000 0010 0001 1000 0000 0000 0000 0000 0000

1000 1000 0001 0000 1

1000 0001 0000 1000 0

1000 1000 0001 0000 1

1001 0001 1000 1000

1000 1000

MSB

Modulo-2 operation is

operation that complies

with the law given below.

0 + 0 = 0

0 + 1 = 1

1 + 0 = 1

1 + 1 = 0

-1 = 1

The code resulting from sending 0116 in LSB first mode is (10000 0000).This the CRC code in the generating polynomial,

(X16 + X12 + X5 + 1), becomes the remainder resulting from dividing (1000 0000)X16 by ( 1 0001 0000 0010 0001) in

conformity with the modulo-2 operation.

(2) Setting 0116

b15

118916

2 cycles

After CRC calculation is complete

Thus the CRC code becomes ( 1001 0001 1000 1000). Since the operation is in LSB first mode, the (1001 0001 1000 1000)

corresponds to 118916 in hexadecimal notation. If the CRC operation in MSB first mode is necessary, set the CRC mode

selection bit to 1. CRC data register stores CRC code for MSB first mode.

CRD data register CRCD

[03BD16, 03BC16]

CRC input register CRCIN

[03BE16]

CRD data register CRCD

[03BD16, 03BC16]

CRC input register CRCIN

[03BE16]

(3) Setting 2316

b15

0A4116

After CRC calculation is complete

CRD data register CRCD

[03BD16, 03BC16]

MSB

LSB

Stores CRC code

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