Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

PCI Express Avalon-ST Valid Data Bytes

I am trying to interpret doc: "Stratix V Hard IP for PCI Express User Guide." Specifically, when using a 256 bit Avalon-ST interface, I wish to determine which of the 32 bytes contain valid dat...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

I just found the answer. The "First BE" (and "Last BE") bits map one-to-one with the validity of the bytes in the first (and last) DWORD of the packet. Bit0==1 says if byte 0 is valid. Bit1==1 says that byte 1 is valid, etc.