
10–10 Chapter 10: Low Latency PHY IP Core
Data Interfaces
Altera Transceiver PHY IP Core November 2012 Altera Corporation
User Guide
Data Interfaces
Table 10–7 describes the signals in the Avalon-ST interface. This interface drives
Avalon-ST 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 10–8 describes the signals that comprise the serial data interface.
Table 10–7. 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.
Table 10–8. 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.
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