Transaction layer routing rules, Transaction layer routing rules –3 – Altera Arria V Hard IP for PCI Express User Manual
Page 191
Chapter 10: Transaction Layer Protocol (TLP) Details
10–3
Transaction Layer Routing Rules
December 2013
Altera Corporation
Arria V Hard IP for PCI Express
User Guide
Transaction Layer Routing Rules
Transactions adhere to the following routing rules:
■
In the receive direction (from the PCI Express link), memory and I/O requests that
match the defined base address register (BAR) contents and vendor-defined
messages with or without data route to the receive interface. The Application
Layer logic processes the requests and generates the read completions, if needed.
■
In Endpoint mode, received Type 0 Configuration requests from the PCI Express
upstream port route to the internal Configuration Space and the Arria V Hard IP
for PCI Express generates and transmits the completion.
■
The Hard IP handles supported received message transactions (Power
Management and Slot Power Limit) internally. The Endpoint also supports the
Unlock and Type 1 Messages. The Root Port supports Interrupt, Type 1 and error
Messages.
■
Vendor-defined Type 0 Message TLPs are passed to the Application Layer.
■
The Transaction Layer treats all other received transactions (including memory or
I/O requests that do not match a defined BAR) as Unsupported Requests. The
Transaction Layer sets the appropriate error bits and transmits a completion, if
needed. These Unsupported Requests are not made visible to the Application
Layer; the header and data is dropped.
Hot Plug Messages
Attention_indicator On Transmit
Receive
No
Yes
No
As per the recommendations in th
these messages are not transmitted to the
Application Layer.
Attention_Indicator
Blink
Transmit
Receive
No
Yes
No
Attention_indicator_
Off
Transmit
Receive
No
Yes
No
Power_Indicator On
Transmit
Receive
No
Yes
No
Power_Indicator Blink
Transmit
Receive
No
Yes
No
Power_Indicator Off
Transmit
Receive
No
Yes
No
Attention
Button_Pressed
Receive
Transmit
No
No
Yes
Notes to
:
(1) In Endpoint mode.
(2) In the
message is no longer mandatory after link training.
Table 10–1. Supported Message Types
(2)
(Part 3 of 3)
Message
Root
Port
Endpoint
Generated by
Comments
App
Layer
Core
Core (with
App Layer
input)