1 files changed, 55 insertions, 0 deletions
diff --git a/usrp2/fpga/simple_gemac/simple_gemac.v b/usrp2/fpga/simple_gemac/simple_gemac.v
new file mode 100644
index 000000000..0769fe615
--- /dev/null
+++ b/usrp2/fpga/simple_gemac/simple_gemac.v
@@ -0,0 +1,55 @@
+
+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), .pause_applied(pause_applied)  // 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_qanta_rcvd), .pause_rcvd(pause_rcvd) 
+      );
+  */ 
+   flow_ctrl_tx flow_ctrl_tx
+     (.rst(reset_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),
+      .pause_quanta_sub(pause_applied)
+      );
+
+   
+endmodule // simple_gemac