Visible to Intel only — GUID: nik1398984177287
Ixiasoft
Visible to Intel only — GUID: nik1398984177287
Ixiasoft
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.
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:
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. |