Altera IP Compiler for PCI Express Manuel d'utilisateur Page 180

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8–4 Chapter 8: Transaction Layer Protocol (TLP) Details
Receive Buffer Reordering
IP Compiler for PCI Express User Guide August 2014 Altera Corporation
The transaction layer sends all memory and I/O requests, as well as completions
generated by the application layer and passed to the transmit interface, to the PCI
Express link.
The IP core can generate and transmit power management, interrupt, and error
signaling messages automatically under the control of dedicated signals.
Additionally, the IP core can generate MSI requests under the control of the
dedicated signals.
Receive Buffer Reordering
The receive datapath implements a receive buffer reordering function that allows
posted and completion transactions to pass non-posted transactions (as allowed by
PCI Express ordering rules) when the application layer is unable to accept additional
non-posted transactions.
The application layer dynamically enables the RX buffer reordering by asserting the
rx_mask
signal. The
rx_mask
signal masks non-posted request transactions made to
the application interface so that only posted and completion transactions are
presented to the application. Table 8–2 lists the transaction ordering rules.
Table 8–2. Transaction Ordering Rules (Part 1 of 2) (Note 1)(12)
Row Pass Column Posted Request Non Posted Request Completion
Memory Write or
Message
Request
Read Request
I/O or Cfg Write
Request
Read Completion
I/O or Cfg Write
Completion
Spec Core Spec Core Spec Core Spec Core Spec Core
Posted
Memory Write or
Message
Request
N (1)
Y/N (2)
N (1)
N (2)
yes yes yes yes
Y/N (1)
Y (2)
N (1)
N (2)
Y/N (1)
Y (2)
No (1)
No (2)
NonPosted
Read Request No No Y/N Yes (1) Y/N Yes (2) Y/N No Y/N No
I/O or
Configuration
Write Request
No No Y/N Yes (3) Y/N Yes (4) Y/N No Y/N No
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