Configuration Transmit Message Interface - 1.3 English

UltraScale+ Devices Integrated Block for PCI Express Product Guide (PG213)

Document ID
PG213
Release Date
2023-10-19
Version
1.3 English

The Configuration Transmit Message interface is used by the user application to transmit messages to the core. The user application supplies the transmit message type and data information to the core, which responds with the done signal. The following table defines the ports in the Configuration Transmit Message interface of the core.

Table 1. Configuration Transmit Message Interface
Port I/O Width Description
cfg_msg_transmit I 1 Configuration Transmit Encoded Message.

This signal is asserted together with cfg_msg_transmit_type, which supplies the encoded message type and cfg_msg_transmit_data, which supplies optional data associated with the message, until cfg_msg_transmit_done is asserted in response.

cfg_msg_transmit_type I 3 Configuration Transmit Encoded Message Type.

Indicates the type of PCI Express message to be transmitted. Encodings supported are:

  • 000b: Latency Tolerance Reporting (LTR)
  • 001b: Optimized Buffer Flush/Fill (OBFF)
  • 010b: Set Slot Power Limit (SSPL)
  • 011b: Power Management (PM PME)
  • 100b -111b: Reserved
cfg_msg_transmit_data I 32 Configuration Transmit Encoded Message Data.

Indicates message data associated with particular message type.

000b: LTR -

  • cfg_msg_transmit_data[31] < Snoop Latency Req
  • cfg_msg_transmit_data[28:26] < Snoop Latency Scale
  • cfg_msg_transmit_data[25:16] < Snoop Latency Value
  • cfg_msg_transmit_data[15] < No-Snoop Latency Requirement
  • cfg_msg_transmit_data[12:10] < No-Snoop Latency Scale
  • cfg_msg_transmit_data[9:0] < No-Snoop Latency Value

001b: OBFF -

  • cfg_msg_transmit_data[3:0] < OBFF Code

010b: SSPL -

  • cfg_msg_transmit_data[9:0] < {Slot Power Limit Scale, Slot Power Limit Value}

011b: PM_PME -

  • cfg_msg_transmit_data[1:0] < PF1, PF0
  • cfg_msg_transmit_data[9:4] < VF5, VF4, VF3, VF2, VF1, VF0, where one or more PFs or VFs can signal PM_PME simultaneously.

100b - 111b: Reserved

cfg_msg_transmit_done O 1 Configuration Transmit Encoded Message Done.

Asserted in response to cfg_mg_transmit assertion, for 1 cycle after the request is complete.