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-rw-r--r--fpga/usrp2/fifo/valve36.v46
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diff --git a/fpga/usrp2/fifo/valve36.v b/fpga/usrp2/fifo/valve36.v
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-//
-// Copyright 2011 Ettus Research LLC
-//
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with this program. If not, see <http://www.gnu.org/licenses/>.
-//
-
-
-
-module valve36
- (input clk, input reset, input clear,
- input shutoff,
- input [35:0] data_i, input src_rdy_i, output dst_rdy_o,
- output [35:0] data_o, output src_rdy_o, input dst_rdy_i);
-
- reg shutoff_int, active;
- wire active_next = (src_rdy_i & dst_rdy_o)? ~data_i[33] : active;
-
- assign data_o = data_i;
-
- assign dst_rdy_o = shutoff_int ? 1'b1 : dst_rdy_i;
- assign src_rdy_o = shutoff_int ? 1'b0 : src_rdy_i;
-
- always @(posedge clk)
- if(reset | clear)
- active <= 0;
- else
- active <= active_next;
-
- always @(posedge clk)
- if(reset | clear)
- shutoff_int <= 0;
- else if(~active_next)
- shutoff_int <= shutoff;
-
-endmodule // valve36