diff options
Diffstat (limited to 'fpga/usrp2/fifo/fifo19_to_fifo36.v')
-rw-r--r-- | fpga/usrp2/fifo/fifo19_to_fifo36.v | 127 |
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 |