Xilinx UG144 manual Receiver Interface, Flow Control Interface

-- DISCONTINUED PRODUCT --

Core Interfaces

R

Receiver Interface

Table 2-2describes 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.

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.

Flow Control Interface

Table 2-3describes the signals used by the client to request a flow control action from the transmit engine. See “Using Flow Control,” on page 53.

Table 2-3: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.

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

UG144 April 24, 2009