aboutsummaryrefslogtreecommitdiffstats
path: root/fpga/usrp2/fifo/fifo19_to_fifo36.v
diff options
context:
space:
mode:
Diffstat (limited to 'fpga/usrp2/fifo/fifo19_to_fifo36.v')
-rw-r--r--fpga/usrp2/fifo/fifo19_to_fifo36.v127
1 files changed, 0 insertions, 127 deletions
diff --git a/fpga/usrp2/fifo/fifo19_to_fifo36.v b/fpga/usrp2/fifo/fifo19_to_fifo36.v
deleted file mode 100644
index 32734405a..000000000
--- a/fpga/usrp2/fifo/fifo19_to_fifo36.v
+++ /dev/null
@@ -1,127 +0,0 @@
-//
-// 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/>.
-//
-
-
-// Parameter LE tells us if we are little-endian.
-// Little-endian means send lower 16 bits first.
-// Default is big endian (network order), send upper bits first.
-
-module fifo19_to_fifo36
- #(parameter LE=0)
- (input clk, input reset, input clear,
- input [18:0] f19_datain,
- input f19_src_rdy_i,
- output f19_dst_rdy_o,
-
- output [35:0] f36_dataout,
- output f36_src_rdy_o,
- input f36_dst_rdy_i,
- output [31:0] debug
- );
-
- // Shortfifo on input to guarantee no deadlock
- wire [18:0] f19_data_int;
- wire f19_src_rdy_int, f19_dst_rdy_int;
-
- fifo_short #(.WIDTH(19)) head_fifo
- (.clk(clk),.reset(reset),.clear(clear),
- .datain(f19_datain), .src_rdy_i(f19_src_rdy_i), .dst_rdy_o(f19_dst_rdy_o),
- .dataout(f19_data_int), .src_rdy_o(f19_src_rdy_int), .dst_rdy_i(f19_dst_rdy_int),
- .space(),.occupied() );
-
- // Actual f19 to f36 which could deadlock if not connected to shortfifos
- reg f36_sof_int, f36_eof_int;
- reg [1:0] f36_occ_int;
- wire [35:0] f36_data_int;
- wire f36_src_rdy_int, f36_dst_rdy_int;
-
- reg [1:0] state;
- reg [15:0] dat0, dat1;
-
- wire f19_sof_int = f19_data_int[16];
- wire f19_eof_int = f19_data_int[17];
- wire f19_occ_int = f19_data_int[18];
-
- wire xfer_out = f36_src_rdy_int & f36_dst_rdy_int;
-
- always @(posedge clk)
- if(f19_src_rdy_int & ((state==0)|xfer_out))
- f36_sof_int <= f19_sof_int;
-
- always @(posedge clk)
- if(f19_src_rdy_int & ((state != 2)|xfer_out))
- f36_eof_int <= f19_eof_int;
-
- always @(posedge clk)
- if(reset)
- begin
- state <= 0;
- f36_occ_int <= 0;
- end
- else
- if(f19_src_rdy_int)
- case(state)
- 0 :
- begin
- dat0 <= f19_data_int;
- if(f19_eof_int)
- begin
- state <= 2;
- f36_occ_int <= f19_occ_int ? 2'b01 : 2'b10;
- end
- else
- state <= 1;
- end
- 1 :
- begin
- dat1 <= f19_data_int;
- state <= 2;
- if(f19_eof_int)
- f36_occ_int <= f19_occ_int ? 2'b11 : 2'b00;
- end
- 2 :
- if(xfer_out)
- begin
- dat0 <= f19_data_int;
- if(f19_eof_int) // remain in state 2 if we are at eof
- f36_occ_int <= f19_occ_int ? 2'b01 : 2'b10;
- else
- state <= 1;
- end
- endcase // case(state)
- else
- if(xfer_out)
- begin
- state <= 0;
- f36_occ_int <= 0;
- end
-
- assign f19_dst_rdy_int = xfer_out | (state != 2);
- assign f36_data_int = LE ? {f36_occ_int,f36_eof_int,f36_sof_int,dat1,dat0} :
- {f36_occ_int,f36_eof_int,f36_sof_int,dat0,dat1};
- assign f36_src_rdy_int = (state == 2);
-
- assign debug = state;
-
- // Shortfifo on output to guarantee no deadlock
- fifo_short #(.WIDTH(36)) tail_fifo
- (.clk(clk),.reset(reset),.clear(clear),
- .datain(f36_data_int), .src_rdy_i(f36_src_rdy_int), .dst_rdy_o(f36_dst_rdy_int),
- .dataout(f36_dataout), .src_rdy_o(f36_src_rdy_o), .dst_rdy_i(f36_dst_rdy_i),
- .space(),.occupied() );
-
-endmodule // fifo19_to_fifo36