Altera IP Compiler for PCI Express - Manual (Page 184)

9–2 Chapter 9: Optional Features
ECRC
IP Compiler for PCI Express User Guide August 2014 Altera Corporation
Table 9–1 summarizes the RX ECRC functionality for all possible conditions.
ECRC on the TX Path
You can turn on the Implement ECRC generation option in the parameter editor, as
described in
“Error Reporting Capabilities Parameters” on page 3–4 and “Capabilities
Parameters” on page 3–13 . When this option is on, the TX path generates ECRC. If
you turn on Implement ECRC forwarding, the ECRC value is forwarded with the
transaction layer packet.
Table 9–2 summarizes the TX ECRC generation and
forwarding. In this table, if TD is 1, the TLP includes an ECRC. TD is the TL digest bit of
the TL packet described in
Appendix A, Transaction Layer Packet (TLP) Header
Formats .
Table 9–1. ECRC Operation on RX Path
ECRC
Forwarding
ECRC
Check
Enable (1)
ECRC
Status
Error TLP Forward to Application
No
No
none No Forwarded
good No Forwarded without its ECRC
bad No Forwarded without its ECRC
Yes
none No Forwarded
good No Forwarded without its ECRC
bad Yes Not forwarded
Yes
No
none No Forwarded
good No Forwarded with its ECRC
bad No Forwarded with its ECRC
Yes
none No Forwarded
good No Forwarded with its ECRC
bad Yes Not forwarded
Note to Table 9–1 :
(1) The ECRC Check Enable is in the configuration space advanced error capabilities and control register.
Table 9–2. ECRC Generation and Forwarding on TX Path (Note 1)
ECRC
Forwarding
ECRC
Generation
Enable (2)
TLP on Application TLP on Link Comments
No
No
TD =0, without ECRC TD =0, without ECRC
TD =1, without ECRC TD =0, without ECRC
Yes
TD =0, without ECRC TD =1, with ECRC
ECRC is generated TD =1, without ECRC TD =1, with ECRC