Altera CRC Compiler - Manual (Page 21)

Chapter 3: Functional Description 3–5
Multi-Channel Operation
© November 2009 Altera Corporation CRC Compiler User Guide
Preliminary
Figure 3–8 shows the operation of a multi-channel generator.
Figure 3–9 and Figure 3–10 show the operation of a multi-channel checker when
processing a good and incorrect codeword, respectively.
Figure 3–8. Multi-Channel Generator Operation
101 000 010
clk
datachannel
datavalid
startofpacket
endofpacket
data
chaninitdone
crcchannel
crcvalid
data1 data2 data4 data1 data3 data4
010
checksum
data3 data2 data1 data2
checksum
Figure 3–9. Multi-Channel Checker Operation with Good Codeword
Figure 3–10. Multi-Channel Checker Operation with Incorrect Codeword
101 000 010
clk
datachannel
datavalid
startofpacket
endofpacket
chaninitdone
crcchannel
crcvalid
crcbad
101 010
data data1 data2 data1 checksum data1 checksum data2 data2 checksum
clk
datavalid
startofpacket
endofpacket
chaninitdone
crcvalid
crcbad
101 000 010 datachannel
data data1 data2 data1 checksum data1 checksum data2 data2 checksum
crcchannel 101 010