Multi Channel DMA Intel® FPGA IP for PCI Express* User Guide

ID 683821
Date 10/06/2023
Public

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4.13. Hard IP Status Interface

Table 55.  Hard IP Status Interface Signals
Signal Name I/O Description
p0_link_up_o Output

When asserted, this signal indicates the link is up.

p0_dl_up_o Output

When asserted, this signal indicates the Data Link (DL) Layer is active.

p0_surprise_down_err_o Output

This signal is the Surprise Down error indicator. This error event is triggered when the PHY layer reports to the Data Link Layer that the link is down.

p0_ltssm_state_o[5:0]

p0_ltssm_state_delay_o[5:0] (only R-Tile)

Output
Indicates the LTSSM state:
  • 6'h00: S_DETECT_QUIET
  • 6'h01: S_DETECT_ACT
  • 6'h02: S_POLL_ACTIVE
  • 6'h03: S_POLL_COMPLIANCE
  • 6'h04: S_POLL_CONFIG
  • 6'h05: S_PRE_DETECT_QUIET
  • 6'h06: S_DETECT_WAIT
  • 6'h07: S_CFG_LINKWD_START
  • 6'h08: S_CFG_LINKWD_ACCEPT
  • 6'h09: S_CFG_LANENUM_WAIT
  • 6'h0A: S_CFG_LANENUM_ACCEPT
  • 6'h0B: S_CFG_COMPLETE
  • 6'h0C: S_CFG_IDLE
  • 6'h0D: S_RCVRY_LOCK
  • 6'h0E: S_RCVRY_SPEED
  • 6'h0F: S_RCVRY_RCVRCFG
  • 6'h10: S_RCVRY_IDLE
  • 6'h11: S_L0
  • 6'h12: S_L0S
  • 6'h13: S_L123_SEND_EIDLE
  • 6'h14: S_L1_IDLE
  • 6'h15: S_L2_IDLE
  • 6'h16: S_L2_WAKE
  • 6'h17: S_DISABLED_ENTRY
  • 6'h18: S_DISABLED_IDLE
  • 6'h19: S_DISABLED
  • 6'h1A: S_LPBK_ENTRY
  • 6'h1B: S_LPBK_ACTIVE
  • 6'h1C: S_LPBK_EXIT
  • 6'h1D: S_LPBK_EXIT_TIMEOUT
  • 6'h1E: S_HOT_RESET_ENTRY
  • 6'h1F: S_HOT_RESET
  • 6'h20: S_RCVRY_EQ0
  • 6'h21: S_RCVRY_EQ1
  • 6'h22: S_RCVRY_EQ2
  • 6'h23: S_RCVRY_EQ3"

p0_ltssm_st_hipfifo_ovrflw_o (only R-Tile)

Output

PCIe Hard IP FIFO storing ltssm_state changes is full.

State changes may have been dropped prior to the current ltssm_state value change.