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/*
* Milkymist SoC
* Copyright (C) 2007, 2008, 2009, 2010 Sebastien Bourdeauducq
*
* 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, version 3 of the License.
*
* 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 pfpu_counters(
input sys_clk,
input first,
input next,
input [6:0] hmesh_last,
input [6:0] vmesh_last,
output [31:0] r0,
output [31:0] r1,
output reg last
);
reg [6:0] r0r;
assign r0 = {25'd0, r0r};
reg [6:0] r1r;
assign r1 = {25'd0, r1r};
always @(posedge sys_clk) begin
if(first) begin
r0r <= 7'd0;
r1r <= 7'd0;
end else if(next) begin
if(r0r == hmesh_last) begin
r0r <= 7'd0;
r1r <= r1r + 7'd1;
end else
r0r <= r0r + 7'd1;
end
end
/* Having some latency in the generation of "last"
* is not a problem, because DMA is never immediately
* triggered after "first" or "next" has been
* asserted.
*/
always @(posedge sys_clk)
last <= (r0r == hmesh_last) & (r1r == vmesh_last);
endmodule
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