Altera IP Compiler for PCI Express - Manual (Page 177)

August 2014 Altera Corporation IP Compiler for PCI Express User Guide
8. Transaction Layer Protocol (TLP)
Details
This chapter provides detailed information about the IP Compiler for PCI Express
TLP handling. It includes the following sections:
■ Supported Message Types
■ Transaction Layer Routing Rules
■ Receive Buffer Reordering
Supported Message Types
Table 8–1 describes the message types supported by the IP core.
Table 8–1. Supported Message Types (Part 1 of 3) (Note 1)
Message
Root
Port
Endpoint
Generated by
Comments
App
Layer
Core
Core
(with AL
input)
INTX Mechanism Messages
For endpoints, only INTA messages are
generated.
Assert_INTA Receive Transmit No Yes No
For root port, legacy interrupts are translated
into TLPs of type Message Interrupt which
triggers the int_status[3:0] signals to the
application layer.:
■ int_status[0] : Interrupt signal A
■ int_status[1] : Interrupt signal B
■ int_status[2] : Interrupt signal C
■ int_status[3] : Interrupt signal D
Assert_INTB Receive Transmit No No No
Assert_INTC Receive Transmit No No No
Assert_INTD Receive Transmit No No No
Deassert_INTA Receive Transmit No Yes No
Deassert_INTB Receive Transmit No No No
Deassert_INTC Receive Transmit No No No
Deassert_INTD Receive Transmit No No No
Power Management Messages
PM_Active_State_Nak Transmit Receive No Yes No
PM_PME Receive Transmit No No Yes
PME_Turn_Off Transmit Receive No No Yes
The pme_to_cr signal sends and acknowledges
this message:
■ Root Port: When pme_to_cr is asserted, the
Root Port sends the PME_turn_off message.
■ Endpoint: When pme_to_cr is asserted to
acknowledge the PME_turn_off message by
sending pme_to_ack to the root port.
PME_TO_Ack Receive Transmit No No Yes
August 2014