Xilinx LOGICORE UG144 - Manual (Page 27)

1-Gigabit Ethernet MAC v8.5 User Guide www.xilinx.com 27
UG144 April 24, 2009
Core Interfaces R
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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.