1 |
49 |
qaztronic |
//////////////////////////////////////////////////////////////////////
|
2 |
|
|
//// ////
|
3 |
|
|
//// Copyright (C) 2019 Authors and OPENCORES.ORG ////
|
4 |
|
|
//// ////
|
5 |
|
|
//// This source file may be used and distributed without ////
|
6 |
|
|
//// restriction provided that this copyright statement is not ////
|
7 |
|
|
//// removed from the file and that any derivative work contains ////
|
8 |
|
|
//// the original copyright notice and the associated disclaimer. ////
|
9 |
|
|
//// ////
|
10 |
|
|
//// This source file is free software; you can redistribute it ////
|
11 |
|
|
//// and/or modify it under the terms of the GNU Lesser General ////
|
12 |
|
|
//// Public License as published by the Free Software Foundation; ////
|
13 |
|
|
//// either version 2.1 of the License, or (at your option) any ////
|
14 |
|
|
//// later version. ////
|
15 |
|
|
//// ////
|
16 |
|
|
//// This source is distributed in the hope that it will be ////
|
17 |
|
|
//// useful, but WITHOUT ANY WARRANTY; without even the implied ////
|
18 |
|
|
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////
|
19 |
|
|
//// PURPOSE. See the GNU Lesser General Public License for more ////
|
20 |
|
|
//// details. ////
|
21 |
|
|
//// ////
|
22 |
|
|
//// You should have received a copy of the GNU Lesser General ////
|
23 |
|
|
//// Public License along with this source; if not, download it ////
|
24 |
|
|
//// from http://www.opencores.org/lgpl.shtml ////
|
25 |
|
|
//// ////
|
26 |
|
|
//////////////////////////////////////////////////////////////////////
|
27 |
|
|
|
28 |
|
|
module
|
29 |
|
|
axis_fanout #(F)
|
30 |
|
|
(
|
31 |
|
|
axis_if axis_in,
|
32 |
|
|
axis_if axis_out[F],
|
33 |
|
|
input aclk,
|
34 |
|
|
input aresetn
|
35 |
|
|
);
|
36 |
|
|
|
37 |
|
|
// --------------------------------------------------------------------
|
38 |
|
|
wire [F-1:0] handshake;
|
39 |
|
|
wire [F-1:0] stalled;
|
40 |
|
|
reg [F-1:0] transfer_stalled;
|
41 |
|
|
wire [F-1:0] out_tready;
|
42 |
|
|
wire all_ready = &out_tready;
|
43 |
|
|
wire [F-1:0] done;
|
44 |
|
|
wire all_done = &done;
|
45 |
|
|
|
46 |
|
|
// --------------------------------------------------------------------
|
47 |
|
|
enum reg [1:0]
|
48 |
|
|
{
|
49 |
|
|
FANOUT = 2'b01,
|
50 |
|
|
STALL = 2'b10
|
51 |
|
|
} state, next_state;
|
52 |
|
|
|
53 |
|
|
// --------------------------------------------------------------------
|
54 |
|
|
always_ff @(posedge aclk)
|
55 |
|
|
if(~aresetn)
|
56 |
|
|
state <= FANOUT;
|
57 |
|
|
else
|
58 |
|
|
state <= next_state;
|
59 |
|
|
|
60 |
|
|
// --------------------------------------------------------------------
|
61 |
|
|
always_comb
|
62 |
|
|
case(state)
|
63 |
|
|
FANOUT: if(~axis_in.tvalid)
|
64 |
|
|
next_state = FANOUT;
|
65 |
|
|
else if(all_ready)
|
66 |
|
|
next_state = FANOUT;
|
67 |
|
|
else
|
68 |
|
|
next_state = STALL;
|
69 |
|
|
|
70 |
|
|
STALL: if(all_done)
|
71 |
|
|
next_state = FANOUT;
|
72 |
|
|
else
|
73 |
|
|
next_state = STALL;
|
74 |
|
|
|
75 |
|
|
default: next_state = FANOUT;
|
76 |
|
|
endcase
|
77 |
|
|
|
78 |
|
|
// --------------------------------------------------------------------
|
79 |
|
|
generate
|
80 |
|
|
for(genvar j = 0; j < F; j++)
|
81 |
|
|
begin: tready_gen
|
82 |
|
|
// --------------------------------------------------------------------
|
83 |
|
|
assign handshake[j] = axis_in.tvalid & axis_out[j].tready;
|
84 |
|
|
assign stalled[j] = axis_in.tvalid & ~axis_out[j].tready;
|
85 |
|
|
assign done[j] = ~transfer_stalled[j] | handshake[j];
|
86 |
|
|
|
87 |
|
|
always_ff @(posedge aclk)
|
88 |
|
|
if(handshake[j])
|
89 |
|
|
transfer_stalled[j] <= 0;
|
90 |
|
|
else if(stalled[j])
|
91 |
|
|
transfer_stalled[j] <= 1;
|
92 |
|
|
|
93 |
|
|
// --------------------------------------------------------------------
|
94 |
|
|
assign out_tready[j] = axis_out[j].tready;
|
95 |
|
|
assign axis_out[j].tlast = axis_in.tlast;
|
96 |
|
|
assign axis_out[j].tuser = axis_in.tuser;
|
97 |
|
|
assign axis_out[j].tdata = axis_in.tdata;
|
98 |
|
|
assign axis_out[j].tstrb = axis_in.tstrb;
|
99 |
|
|
assign axis_out[j].tkeep = axis_in.tkeep;
|
100 |
|
|
assign axis_out[j].tid = axis_in.tid;
|
101 |
|
|
assign axis_out[j].tdest = axis_in.tdest;
|
102 |
|
|
assign axis_out[j].tvalid = (state == FANOUT) ? axis_in.tvalid : transfer_stalled[j];
|
103 |
|
|
end
|
104 |
|
|
endgenerate
|
105 |
|
|
|
106 |
|
|
// --------------------------------------------------------------------
|
107 |
|
|
assign axis_in.tready = (state == FANOUT) ? all_ready : (next_state == FANOUT);
|
108 |
|
|
|
109 |
|
|
// --------------------------------------------------------------------
|
110 |
|
|
endmodule
|