11 Sep
2008
11 Sep
'08
7:12 p.m.
> Yes. Indeed. I checked it again and it is the
regular
> CRC circuit with unusual initial value and
polynomial.
What are these values? They are not documented in
the data sheet.
The polynomial is 0x140a0445
(x32+x28+x26+x19+x17+x10+x6+x2+1), the initial value
is 0x9dcd57c0.
It is need to do following steps to check crc:
1 Init sift register by initial value
2 Process 0xf8 (MSB first)
3 Process 512 bytes of data
4 Process 4 bytes CRC.
If everything is ok then value in the shift register
will be zero.
Alexander.