Inc. Network Card User Manual

1-Gigabit Ethernet MAC v8.5 User Guide www.xilinx.com 27

UG144 April 24, 2009

Core Interfaces

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Receiver Interface

Table 2-2 describes the client-side receiver signals of the GEMAC core. These signals are

used by to transfer data to the client. See “Receiving Inbound Frames,” on page 39.

Flow Control Interface

Table 2-3 describes the signals used by the client to request a flow control action from the

transmit engine. See “Using Flow Control,” on page 53.

Table 2-2: Receive Client Interface Signal Pins

Signal Direction Clock Domain Description

rx_data[7:0] Output gmii_rx_clk Frame data received is

supplied on this port.

rx_data_valid Output gmii_rx_clk Control signal for the rx_data

port.

rx_good_frame Output gmii_rx_clk Asserted at end of frame

reception to indicate that the

frame should be processed by

the MAC client.

rx_bad_frame Output gmii_rx_clk Asserted at end of frame

reception to indicate that the

frame should be discarded by

the MAC client.

rx_statistics_vector[27:0] Output gmii_rx_clk Provides statistical

information about the last

frame received.

rx_statistics_valid Output gmii_rx_clk Asserted at end of frame

reception, indicating that the

rx_statistics_vector is valid.

Table 2-3: Flow Control Interface Signal Pinout

Signal Direction Clock Domain Description

pause_req Input gtx_clk Pause request. sends a pause

frame down the link.

pause_val[15:0] Input gtx_clk Pause value; inserted into the

parameter field of the

transmitted pause frame.