Ecrc on the tx path – Altera IP Compiler for PCI Express User Manual
Page 184
9–2
Chapter 9: Optional Features
ECRC
IP Compiler for PCI Express User Guide
August 2014
Altera Corporation
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
. 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.
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
.
Table 9–1. ECRC Operation on RX Path
ECRC
Forwarding
ECRC
Check
Enable
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
:
(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
ECRC
Forwarding
ECRC
Generation
Enable
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