Pilot Communications SPM33 - Page 44

the new generator polynomial, with result stored in the16-bit register. Return to step 4.
5b) If the bit shifted out to the right is zero, return to step 4.
6) Repeat steps 4 and 5 until 8 shifts have been performed.
7) Exclusive OR the next data byte with the 16-bit register.
8) Repeat steps 4 through 7 until all bytes of the packet have been calculate by XOR
9) The content of the 16-bit register is CRC-16
Procedure for Calculating the 6403 Bytes of 16 Hex.
Step Byte Action Register Bit# Shift
2 Initial Value 1111 1111 1111 1111
1 Load the first byte 0000 0000 0110
0100
3 XOR 1111 1111 1001 1011
4 SHIFT 1 bit to the right 0111 1111 1100 1101 1 1
5a XOR polynomial 1101 1111 1100 1100
4 SHIFT 1 bit to the right 0110 1111 1110 0110 2 0
4 SHIFT 1 bit to the right 0011 0111 1111 0011 3 0
4 SHIFT 1 bit to the right 0001 1011 1111
1001
4 1
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