F-Tile Architecture and PMA and FEC Direct PHY IP User Guide

ID 683872
Date 4/01/2024
Document Table of Contents

3.4.7. RX PMA Status Signals

Table 51.  RX PMA Status SignalsRefer to Variables Defining Bits for the Interfacing Ports in Port and Signal Reference for variable definitions.
Signal Name Clocks Domain/Resets Direction Description
fgt_rx_signal_detect[N-1:0] asynchronous output FGT RX signal detect indicator.
fgt_rx_signal_detect_lfps[N-1:0] asynchronous output

Indicates SATA low frequency periodic signaling (LFPS) signal detection.

rx_is_lockedtoref[N-1:0] asynchronous output CDR lock status signal.
  • 1’b1 – CDR is frequency locked to reference clock within the PPM threshold.
  • 1’b0 – CDR is not frequency locked within the PPM threshold. Applicable to FGT PMA only

When lockedtodata stays high, the lockedtoref signal status is insignificant.

rx_is_lockedtodata[N-1:0] asynchronous output RX CDR data lock status signal.
  • 1’b0: CDR is not locked to data.
  • 1’b1: CDR is locked to data. Applicable to both FGT and FHT PMA.

When asserted, indicates that the CDR is in locked-to-data mode. When continuously asserted and does not switch between asserted and deasserted, you can confirm that the CDR is actually locked to data.

fgt_rx_set_locktoref[N-1:0] asynchronous input

1'b1: keep CDR in manual mode.

1'b0: keep CDR in auto mode.

fgt_rx_set_locktodata[N-1:0] asynchronous input This signal only functions when CDR is in manual mode and fgt_rx_set_locktoref is set to 1'b1.

1'b1: keep CDR in manual lock-to-data mode.

1'b0: keep CDR in manual lock-to-reference mode.

fgt_rx_cdr_freeze[N-1: 0] asynchronous input This port is used in GPON to freeze the CDR lock state during inactive time-slots.
  • 1'b1: Freeze the CDR
  • 1'b0: Unfreeze the CDR
fgt_rx_cdr_fast_freeze_sel[N-1: 0] asynchronous input

This port is used in GPON for CDR freeze signal select. For GPON mode, you must tie this signal to 1'b0.