V-Series Transceiver PHY IP Core User Guide

ID 683171
Date 7/26/2022
Public
Document Table of Contents

11.9. Low Latency PHY Data Interfaces

The following table describes the signals in the Avalon-ST interface. This interface drives AvalonST TX and RX data to and from the FPGA fabric. These signals are named from the point of view of the MAC so that the TX interface is an Avalon-ST sink interface and the RX interface is an Avalon-ST source.

Table 154.  Avalon-ST interface  

Signal Name

Direction

Description

tx_parallel_data[<n><w>-1:0]

Input

This is TX parallel data driven from the MAC FPGA fabric. The ready latency on this interface is 0, so that the PCS in Low-Latency Bypass Mode or the MAC in PMA Direct mode must be able to accept data as soon as it comes out of reset.

tx_clkout[<n>-1:0]

Output

This is the clock for TX parallel data.

tx_ready[<n>-1:0]

Output

When asserted, indicates that the Low Latency IP Core has exited the reset state is ready to receive data from the MAC. This signal is available if you select Enable embedded reset control on the Additional Options tab.

rx_parallel_data [ <n><w>-1:0]

Output

This is RX parallel data driven by the Low Latency PHY IP Core. Data driven from this interface is always valid.

rx_clkout[<n>-1:0]

Output

Low speed clock recovered from the serial data.

rx_ready[<n>-1:0]

Output

This is the ready signal for the RX interface. The ready latency on this interface is 0, so that the MAC must be able to accept data as soon as the PMA comes out of reset. This signal is available if you select Enable embedded reset control on the Additional Options tab.

The following table describes the signals that comprise the serial data interface:

Table 155.  Serial Data Interface 

Signal Name

Direction

Description

rx_serial_data[<n>-1:0]

Input

Differential high speed input serial data.

tx_serial_data [<n>-1:0]

Output

Differential high speed output serial data.