Implement Eth flow control using pause frames

Not fully tested, but it seems to work without frame errors, sequence
number errors or ethernet overruns.  Still of course will get tx underruns
on a slow machine, and the transmitted signal has some issues though.

1 files changed, 3 insertions, 3 deletions

diff --git a/usrp2/fpga/simple_gemac/simple_gemac.v b/usrp2/fpga/simple_gemac/simple_gemac.v
index 5ec2fa2ba..868a66819 100644
--- a/usrp2/fpga/simple_gemac/simple_gemac.v
+++ b/usrp2/fpga/simple_gemac/simple_gemac.v
@@ -6,7 +6,7 @@ module simple_gemac
    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, input pause_en,
+   input pause_req, input [15:0] pause_time_req, input pause_respect_en,
 
    // Settings
    input [47:0] ucast_addr, input [47:0] mcast_addr,
@@ -33,7 +33,7 @@ module simple_gemac
       .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(ucast_addr),
-      .pause_req(pause_req), .pause_time(pause_time),  // We request flow control
+      .pause_req(pause_req), .pause_time(pause_time_req),  // We request flow control
       .pause_apply(pause_apply), .paused(paused)  // We respect flow control
       );
 
@@ -50,7 +50,7 @@ module simple_gemac
 
    flow_ctrl_tx flow_ctrl_tx
      (.rst(rst_txclk), .tx_clk(tx_clk),
-      .tx_pause_en(pause_en),
+      .tx_pause_en(pause_respect_en),
       .pause_quanta(pause_quanta_rcvd), // 16 bit value
       .pause_quanta_val(pause_rcvd),
       .pause_apply(pause_apply),