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-rw-r--r--fpga/usrp2/gpmc/new_read.v62
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diff --git a/fpga/usrp2/gpmc/new_read.v b/fpga/usrp2/gpmc/new_read.v
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--- a/fpga/usrp2/gpmc/new_read.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 new_read
- (input clk, input reset, input clear,
- input [17:0] data_i, input src_rdy_i, output dst_rdy_o,
- output reg [15:0] EM_D, input EM_NCS, input EM_NOE,
- output have_packet, output [15:0] frame_len, output bus_error);
-
- wire [17:0] data_int;
- wire src_rdy_int, dst_rdy_int;
-
- fifo_cascade #(.WIDTH(18), .SIZE(12)) rx_fifo
- (.clk(clk), .reset(reset), .clear(clear),
- .datain(data_i), .src_rdy_i(src_rdy_i), .dst_rdy_o(dst_rdy_o), .space(),
- .dataout(data_int), .src_rdy_o(src_rdy_int), .dst_rdy_i(dst_rdy_int), .occupied());
-
- fifo_watcher fifo_watcher
- (.clk(clk), .reset(reset), .clear(clear),
- .src_rdy1(src_rdy_i), .dst_rdy1(dst_rdy_o), .sof1(data_i[16]), .eof1(data_i[17]),
- .src_rdy2(src_rdy_int), .dst_rdy2(dst_rdy_int), .sof2(data_int[16]), .eof2(data_int[17]),
- .have_packet(have_packet), .length(frame_len), .bus_error(bus_error),
- .debug());
-
- // Synchronize the async control signals
- reg [1:0] cs_del, oe_del;
- reg [15:0] counter;
-
- always @(posedge clk)
- if(reset)
- begin
- cs_del <= 2'b11;
- oe_del <= 2'b11;
- end
- else
- begin
- cs_del <= { cs_del[0], EM_NCS };
- oe_del <= { oe_del[0], EM_NOE };
- end
-
- assign dst_rdy_int = ( ~cs_del[1] & ~oe_del[1] & oe_del[0]); // change output on trailing edge
-
- //always @(posedge clk) // 3 cycle latency ( OE -> OE_del -> FIFO -> output REG )
- always @* // 2 cycle latency ( OE -> OE_del -> FIFO )
- EM_D <= data_int[15:0];
-
-endmodule // new_read