1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
|
//
// Copyright 2012 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 fifo36_to_gpmc16
#(
parameter FIFO_SIZE = 9,
//not ready until minimum xfers of occupancy available
parameter MIN_OCC16 = 2
)
(
//input fifo interface
input fifo_clk, input fifo_rst,
input [35:0] in_data,
input in_src_rdy,
output in_dst_rdy,
//output interface
input gpif_clk, input gpif_rst,
output [15:0] out_data,
output valid,
input enable,
output eof,
output reg has_data
);
wire [15:0] fifo_occ;
always @(posedge gpif_clk)
has_data <= (fifo_occ >= MIN_OCC16);
wire [35:0] data_int;
wire src_rdy_int, dst_rdy_int;
fifo_2clock_cascade #(.WIDTH(36), .SIZE(6)) fifo_2clk
(.wclk(fifo_clk), .datain(in_data), .src_rdy_i(in_src_rdy), .dst_rdy_o(in_dst_rdy), .space(),
.rclk(gpif_clk), .dataout(data_int), .src_rdy_o(src_rdy_int), .dst_rdy_i(dst_rdy_int), .occupied(),
.arst(fifo_rst | gpif_rst));
wire [18:0] data19_int;
wire data19_src_rdy_int, data19_dst_rdy_int;
fifo36_to_fifo19 #(.LE(1)) f36_to_f19
(.clk(gpif_clk), .reset(gpif_rst), .clear(1'b0),
.f36_datain(data_int), .f36_src_rdy_i(src_rdy_int), .f36_dst_rdy_o(dst_rdy_int),
.f19_dataout(data19_int), .f19_src_rdy_o(data19_src_rdy_int), .f19_dst_rdy_i(data19_dst_rdy_int) );
wire [17:0] data18_int;
fifo_cascade #(.WIDTH(18), .SIZE(FIFO_SIZE+1)) occ_ctrl_fifo
(.clk(gpif_clk), .reset(gpif_rst), .clear(1'b0),
.datain(data19_int[17:0]), .src_rdy_i(data19_src_rdy_int), .dst_rdy_o(data19_dst_rdy_int), .space(),
.dataout(data18_int), .src_rdy_o(valid), .dst_rdy_i(enable), .occupied(fifo_occ));
assign out_data = data18_int[15:0];
assign eof = data18_int[17];
endmodule //fifo_to_gpmc16
|
