Fuji Electric FRENIC-AQUA series User Manual page 62

Generative polynomial expression GP ← "A001"
Data length calculation N <- Data length
The A = n
the lower order byte of the word data.
The upper order byte is "0."
No
CRC DATA ← CRC DATA XOR GP
CRC DATA ← CRC DATA XOR A
Yes
Is there a bit shift carry?
The CRC data is added to the last
block of the transmission frame.
START
Initial setting
Remainder R ← "FFFF"
Data length counter n ← 0
n == N ?
Yes
No
n++
th transmitted byte is set at
Shift Count ← 0
Shift Count == 0 ?
Yes
n == 1 ?
Yes
No
CRC DATA ← A XOR R
Shift Count++
Shift Count < 8 ? >
No
CRC data > 1 bit shift
No
Yes
ＥＮＤ
Figure 3.1 CRC algorithm
3-21
3.4 CRC-16