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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 ram_to_fifo
(input clk, input reset,
input [10:0] read_length, // From the dbsm (?)
output read_en, output reg [8:0] read_addr, input [31:0] read_data, input read_ready, output read_done,
output [35:0] data_o, output src_rdy_o, input dst_rdy_i);
// read_length/2 = number of 32 bit lines, numbered 0 through read_length/2-1
wire [8:0] last_line = (read_length[10:1]-1);
reg read_phase, sop;
assign read_en = (read_phase == 0) | dst_rdy_i;
assign src_rdy_o = (read_phase == 1);
always @(posedge clk)
if(reset)
begin
read_addr <= 0;
read_phase <= 0;
sop <= 1;
end
else
if(read_phase == 0)
begin
read_addr <= read_ready;
read_phase <= read_ready;
end
else if(dst_rdy_i)
begin
sop <= 0;
if(read_addr == last_line)
begin
read_addr <= 0;
read_phase <= 0;
end
else
read_addr <= read_addr + 1;
end
assign read_done = (read_phase == 1) & (read_addr == last_line) & dst_rdy_i;
wire eop = (read_addr == last_line);
assign data_o = { 2'b00, eop, sop, read_data };
endmodule // ram_to_fifo
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