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module simple_gemac
(input clk125, input reset,
// GMII
output GMII_GTX_CLK, output GMII_TX_EN, output GMII_TX_ER, output [7:0] GMII_TXD,
input GMII_RX_CLK, input GMII_RX_DV, input GMII_RX_ER, input [7:0] GMII_RXD,
// Flow Control Interface
input pause_req, input [15:0] pause_time,
// RX Client Interface
output rx_clk, output [7:0] rx_data, output rx_valid, output rx_error, output rx_ack,
// TX Client Interface
output tx_clk, input [7:0] tx_data, input tx_valid, input tx_error, output tx_ack
);
localparam SGE_IFG = 8'd12; // 12 should be the absolute minimum
localparam SGE_RESPECT_FLOW_CTRL = 1'b1; // stop sending if other side requests
wire rst_rxclk, rst_txclk;
oneshot_2clk tx_rst_1shot (.clk_in(tx_clk),.in(reset),.clk_out(tx_clk),.out(rst_txclk)); // FIXME clocks
oneshot_2clk rx_rst_1shot (.clk_in(sys_clk),.in(reset),.clk_out(rx_clk),.out(rst_rxclk));
wire [15:0] pause_quanta_rcvd;
simple_gemac_tx simple_gemac_tx
(.clk125(clk125),.reset(rst_txclk),
.GMII_GTX_CLK(GMII_GTX_CLK), .GMII_TX_EN(GMII_TX_EN),
.GMII_TX_ER(GMII_TX_ER), .GMII_TXD(GMII_TXD),
.tx_clk(tx_clk), .tx_data(tx_data), .tx_valid(tx_valid), .tx_error(tx_error), .tx_ack(tx_ack),
.ifg(SGE_IFG), .mac_addr(48'hF1_F2_F3_F4_F5_F6),
.pause_req(pause_req), .pause_time(pause_time), // We request flow control
.pause_apply(pause_apply), .paused(paused) // We respect flow control
);
simple_gemac_rx simple_gemac_rx
(.reset(rst_rxclk),
.GMII_RX_CLK(GMII_RX_CLK), .GMII_RX_DV(GMII_RX_DV),
.GMII_RX_ER(GMII_RX_ER), .GMII_RXD(GMII_RXD),
.rx_clk(rx_clk), .rx_data(rx_data), .rx_valid(rx_valid), .rx_error(rx_error), .rx_ack(rx_ack),
.pause_quanta_rcvd(pause_quanta_rcvd), .pause_rcvd(pause_rcvd)
);
flow_ctrl_tx flow_ctrl_tx
(.rst(rst_txclk), .tx_clk(tx_clk),
.tx_pause_en(SGE_RESPECT_FLOW_CTRL),
.pause_quanta(pause_quanta_rcvd), // 16 bit value
.pause_quanta_val(pause_rcvd),
.pause_apply(pause_apply),
.paused(paused)
);
endmodule // simple_gemac
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