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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/>.
//
// Control DSP pipeline with 1 cycle per stage. Minimum 2 stages or this won't work
module pipectrl
#(parameter STAGES = 2,
parameter TAGWIDTH = 1)
(input clk,
input reset,
input src_rdy_i,
output dst_rdy_o,
output src_rdy_o,
input dst_rdy_i,
output [STAGES-1:0] strobes,
output [STAGES-1:0] valids,
input [TAGWIDTH-1:0] tag_i,
output [TAGWIDTH-1:0] tag_o);
wire new_input = src_rdy_i & dst_rdy_o;
wire new_output = src_rdy_o & dst_rdy_i;
wire [TAGWIDTH-1:0] tags [STAGES-1:0];
assign dst_rdy_o = ~valids[0] | strobes[1];
pipestage #(.TAGWIDTH(TAGWIDTH)) head
(.clk(clk),.reset(reset), .stb_in(strobes[0]), .stb_out(strobes[1]),.valid(valids[0]),
.tag_in(tag_i), .tag_out(tags[0]));
assign strobes[0] = src_rdy_i & (~valids[0] | strobes[1]);
genvar i;
generate
for(i = 1; i < STAGES - 1; i = i + 1)
begin : gen_stages
pipestage #(.TAGWIDTH(TAGWIDTH)) pipestage
(.clk(clk),.reset(reset), .stb_in(strobes[i]),.stb_out(strobes[i+1]),.valid(valids[i]),
.tag_in(tags[i-1]),.tag_out(tags[i]));
assign strobes[i] = valids[i-1] & (~valids[i] | strobes[i+1]);
end
endgenerate
pipestage #(.TAGWIDTH(TAGWIDTH)) tail
(.clk(clk),.reset(reset), .stb_in(strobes[STAGES-1]), .stb_out(dst_rdy_i),.valid(valids[STAGES-1]),
.tag_in(tags[STAGES-2]), .tag_out(tags[STAGES-1]));
assign strobes[STAGES-1] = valids[STAGES-2] & (~valids[STAGES-1] | new_output);
assign src_rdy_o = valids[STAGES-1];
assign tag_o = tags[STAGES-1];
endmodule // pipectrl
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