Configuration Transmit Message Interface - 4.4 English

UltraScale Devices Gen3 Integrated Block for PCI Express LogiCORE IP Product Guide (PG156)
Document ID
PG156
Release Date
2024-12-06
Version
4.4 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 Descriptions
Port Direction Width Description
cfg_msg_transmit Input 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 Input 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 Input 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 Output 1

Configuration Transmit Encoded Message Done.

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