Chapter 5: Core Architecture

AV Traffic Receiver Path Signals

Table 5-5defines the core client side AV traffic receiver signals, used by the core to transfer data to the AV client. All signals are synchronous to the MAC receiver clock, rx_clk, which must be qualified by the corresponding clock enable, rx_clk_en (see “Clocks and Resets”).

Table 5-5:AV Traffic Signals: Receiver Path

Signal

Direction

Description

 

 

 

av_rx_data[7:0]

Output

AV frame data received is supplied on this port.

 

 

 

av_rx_valid

Output

Control signal for the av_rx_data[7:0] port

 

 

 

av_rx_frame_good

Output

Asserted at the end of frame reception to indicate

 

 

that the frame should be processed by the MAC

 

 

client.

 

 

 

av_rx_frame_bad

Output

Asserted at the end of frame reception to indicate

 

 

that the frame should be discarded by the MAC

 

 

client: either the frame contained an error, or it was

 

 

intended for the PTP or legacy traffic channel.

 

 

 

Tri-Mode Ethernet MAC Client Interface

Table 5-6, Table 5-7and Table 5-8list the ports of the core which connect directly to the port signals of the Tri-Mode Ethernet MAC core, which are identically named. For detailed information about the Tri-Mode Ethernet MAC ports, see the Tri-Mode Ethernet MAC User Guide (UG138).

MAC Transmitter Interface

These signals connect directly to the identically named Tri-Mode Ethernet MAC signals and are synchronous to tx_clk.

Table 5-6:Tri-Mode Ethernet MAC Transmitter Interface

Signal

Direction

Description

 

 

 

tx_data[7:0]

Output

Frame data to be transmitted is supplied on this port

 

 

 

tx_data_valid

Output

A data valid control signal for data on the

 

 

tx_data[7:0] port

 

 

 

tx_underrun

Output

Asserted to force the MAC to corrupt the current frame

 

 

 

tx_ack

Input

Handshaking signal asserted when the current data on

 

 

tx_data[7:0] has been accepted by the MAC.

 

 

 

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Ethernet AVB Endpoint User Guide

 

 

UG492 July 23, 2010

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Xilinx UG492 manual Tri-Mode Ethernet MAC Client Interface, AV Traffic Receiver Path Signals, MAC Transmitter Interface