-
Notifications
You must be signed in to change notification settings - Fork 265
/
axi_lite_xbar.sv
305 lines (281 loc) · 13.4 KB
/
axi_lite_xbar.sv
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
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
// Copyright (c) 2020 ETH Zurich and University of Bologna.
// Copyright and related rights are licensed under the Solderpad Hardware
// License, Version 0.51 (the "License"); you may not use this file except in
// compliance with the License. You may obtain a copy of the License at
// http://solderpad.org/licenses/SHL-0.51. Unless required by applicable law
// or agreed to in writing, software, hardware and materials distributed under
// this License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
// CONDITIONS OF ANY KIND, either express or implied. See the License for the
// specific language governing permissions and limitations under the License.
//
// Authors:
// - Wolfgang Roenninger <wroennin@iis.ee.ethz.ch>
// - Fabian Schuiki <fschuiki@iis.ee.ethz.ch>
// - Andreas Kurth <akurth@iis.ee.ethz.ch>
// axi_lite_xbar: Fully-connected AXI4-Lite crossbar.
// See `doc/axi_lite_xbar.md` for the documentation,
// including the definition of parameters and ports.
`include "axi/typedef.svh"
module axi_lite_xbar #(
parameter axi_pkg::xbar_cfg_t Cfg = '0,
parameter type aw_chan_t = logic,
parameter type w_chan_t = logic,
parameter type b_chan_t = logic,
parameter type ar_chan_t = logic,
parameter type r_chan_t = logic,
parameter type axi_req_t = logic,
parameter type axi_resp_t = logic,
parameter type rule_t = axi_pkg::xbar_rule_64_t,
// DEPENDENT PARAMETERS, DO NOT OVERWRITE!
parameter int unsigned MstIdxWidth = (Cfg.NoMstPorts > 32'd1) ? $clog2(Cfg.NoMstPorts) : 32'd1
) (
input logic clk_i,
input logic rst_ni,
input logic test_i,
input axi_req_t [Cfg.NoSlvPorts-1:0] slv_ports_req_i,
output axi_resp_t [Cfg.NoSlvPorts-1:0] slv_ports_resp_o,
output axi_req_t [Cfg.NoMstPorts-1:0] mst_ports_req_o,
input axi_resp_t [Cfg.NoMstPorts-1:0] mst_ports_resp_i,
input rule_t [Cfg.NoAddrRules-1:0] addr_map_i,
input logic [Cfg.NoSlvPorts-1:0] en_default_mst_port_i,
input logic [Cfg.NoSlvPorts-1:0][MstIdxWidth-1:0] default_mst_port_i
);
typedef logic [Cfg.AxiAddrWidth-1:0] addr_t;
typedef logic [Cfg.AxiDataWidth-1:0] data_t;
typedef logic [Cfg.AxiDataWidth/8-1:0] strb_t;
// to account for the decoding error slave
typedef logic [$clog2(Cfg.NoMstPorts + 1)-1:0] mst_port_idx_t;
// full AXI typedef for the decode error slave, id_t and user_t are logic and will be
// removed during logic optimization as they are stable
`AXI_TYPEDEF_AW_CHAN_T(full_aw_chan_t, addr_t, logic, logic)
`AXI_TYPEDEF_W_CHAN_T(full_w_chan_t, data_t, strb_t, logic)
`AXI_TYPEDEF_B_CHAN_T(full_b_chan_t, logic, logic)
`AXI_TYPEDEF_AR_CHAN_T(full_ar_chan_t, addr_t, logic, logic)
`AXI_TYPEDEF_R_CHAN_T(full_r_chan_t, data_t, logic, logic)
`AXI_TYPEDEF_REQ_T(full_req_t, full_aw_chan_t, full_w_chan_t, full_ar_chan_t)
`AXI_TYPEDEF_RESP_T(full_resp_t, full_b_chan_t, full_r_chan_t)
// signals from the axi_lite_demuxes, one index more for decode error routing
axi_req_t [Cfg.NoSlvPorts-1:0][Cfg.NoMstPorts:0] slv_reqs;
axi_resp_t [Cfg.NoSlvPorts-1:0][Cfg.NoMstPorts:0] slv_resps;
// signals into the axi_lite_muxes, are of type slave as the multiplexer extends the ID
axi_req_t [Cfg.NoMstPorts-1:0][Cfg.NoSlvPorts-1:0] mst_reqs;
axi_resp_t [Cfg.NoMstPorts-1:0][Cfg.NoSlvPorts-1:0] mst_resps;
for (genvar i = 0; i < Cfg.NoSlvPorts; i++) begin : gen_slv_port_demux
logic [MstIdxWidth-1:0] dec_aw, dec_ar;
mst_port_idx_t slv_aw_select, slv_ar_select;
logic dec_aw_error;
logic dec_ar_error;
full_req_t decerr_req;
full_resp_t decerr_resp;
addr_decode #(
.NoIndices ( Cfg.NoMstPorts ),
.NoRules ( Cfg.NoAddrRules ),
.addr_t ( addr_t ),
.rule_t ( rule_t )
) i_axi_aw_decode (
.addr_i ( slv_ports_req_i[i].aw.addr ),
.addr_map_i ( addr_map_i ),
.idx_o ( dec_aw ),
.dec_valid_o ( /*not used*/ ),
.dec_error_o ( dec_aw_error ),
.en_default_idx_i ( en_default_mst_port_i[i] ),
.default_idx_i ( default_mst_port_i[i] )
);
addr_decode #(
.NoIndices ( Cfg.NoMstPorts ),
.addr_t ( addr_t ),
.NoRules ( Cfg.NoAddrRules ),
.rule_t ( rule_t )
) i_axi_ar_decode (
.addr_i ( slv_ports_req_i[i].ar.addr ),
.addr_map_i ( addr_map_i ),
.idx_o ( dec_ar ),
.dec_valid_o ( /*not used*/ ),
.dec_error_o ( dec_ar_error ),
.en_default_idx_i ( en_default_mst_port_i[i] ),
.default_idx_i ( default_mst_port_i[i] )
);
assign slv_aw_select = (dec_aw_error) ?
mst_port_idx_t'(Cfg.NoMstPorts) : mst_port_idx_t'(dec_aw);
assign slv_ar_select = (dec_ar_error) ?
mst_port_idx_t'(Cfg.NoMstPorts) : mst_port_idx_t'(dec_ar);
// make sure that the default slave does not get changed, if there is an unserved Ax
// pragma translate_off
`ifndef VERILATOR
default disable iff (~rst_ni);
default_aw_mst_port_en: assert property(
@(posedge clk_i) (slv_ports_req_i[i].aw_valid && !slv_ports_resp_o[i].aw_ready)
|=> $stable(en_default_mst_port_i[i]))
else $fatal (1, $sformatf("It is not allowed to change the default mst port\
enable, when there is an unserved Aw beat. Slave Port: %0d", i));
default_aw_mst_port: assert property(
@(posedge clk_i) (slv_ports_req_i[i].aw_valid && !slv_ports_resp_o[i].aw_ready)
|=> $stable(default_mst_port_i[i]))
else $fatal (1, $sformatf("It is not allowed to change the default mst port\
when there is an unserved Aw beat. Slave Port: %0d", i));
default_ar_mst_port_en: assert property(
@(posedge clk_i) (slv_ports_req_i[i].ar_valid && !slv_ports_resp_o[i].ar_ready)
|=> $stable(en_default_mst_port_i[i]))
else $fatal (1, $sformatf("It is not allowed to change the enable, when\
there is an unserved Ar beat. Slave Port: %0d", i));
default_ar_mst_port: assert property(
@(posedge clk_i) (slv_ports_req_i[i].ar_valid && !slv_ports_resp_o[i].ar_ready)
|=> $stable(default_mst_port_i[i]))
else $fatal (1, $sformatf("It is not allowed to change the default mst port\
when there is an unserved Ar beat. Slave Port: %0d", i));
`endif
// pragma translate_on
axi_lite_demux #(
.aw_chan_t ( aw_chan_t ), // AW Channel Type
.w_chan_t ( w_chan_t ), // W Channel Type
.b_chan_t ( b_chan_t ), // B Channel Type
.ar_chan_t ( ar_chan_t ), // AR Channel Type
.r_chan_t ( r_chan_t ), // R Channel Type
.axi_req_t ( axi_req_t ),
.axi_resp_t ( axi_resp_t ),
.NoMstPorts ( Cfg.NoMstPorts + 1 ),
.MaxTrans ( Cfg.MaxMstTrans ),
.FallThrough ( Cfg.FallThrough ),
.SpillAw ( Cfg.LatencyMode[9] ),
.SpillW ( Cfg.LatencyMode[8] ),
.SpillB ( Cfg.LatencyMode[7] ),
.SpillAr ( Cfg.LatencyMode[6] ),
.SpillR ( Cfg.LatencyMode[5] )
) i_axi_lite_demux (
.clk_i, // Clock
.rst_ni, // Asynchronous reset active low
.test_i, // Testmode enable
.slv_req_i ( slv_ports_req_i[i] ),
.slv_aw_select_i ( slv_aw_select ),
.slv_ar_select_i ( slv_ar_select ),
.slv_resp_o ( slv_ports_resp_o[i] ),
.mst_reqs_o ( slv_reqs[i] ),
.mst_resps_i ( slv_resps[i] )
);
// connect the decode error module to the last index of the demux master port
// typedef as the decode error slave uses full axi
axi_lite_to_axi #(
.AxiDataWidth ( Cfg.AxiDataWidth ),
.req_lite_t ( axi_req_t ),
.resp_lite_t ( axi_resp_t ),
.axi_req_t ( full_req_t ),
.axi_resp_t ( full_resp_t )
) i_dec_err_conv (
.slv_req_lite_i ( slv_reqs[i][Cfg.NoMstPorts] ),
.slv_resp_lite_o ( slv_resps[i][Cfg.NoMstPorts] ),
.slv_aw_cache_i ( 4'd0 ),
.slv_ar_cache_i ( 4'd0 ),
.mst_req_o ( decerr_req ),
.mst_resp_i ( decerr_resp )
);
axi_err_slv #(
.AxiIdWidth ( 32'd1 ), // ID width is one as defined as logic above
.axi_req_t ( full_req_t ), // AXI request struct
.axi_resp_t ( full_resp_t ), // AXI response struct
.Resp ( axi_pkg::RESP_DECERR ),
.ATOPs ( 1'b0 ), // no ATOPs in AXI4-Lite
.MaxTrans ( 1 ) // Transactions terminate at this slave, and AXI4-Lite
// transactions have only a single beat.
) i_axi_err_slv (
.clk_i ( clk_i ), // Clock
.rst_ni ( rst_ni ), // Asynchronous reset active low
.test_i ( test_i ), // Testmode enable
// slave port
.slv_req_i ( decerr_req ),
.slv_resp_o ( decerr_resp )
);
end
// cross all channels
for (genvar i = 0; i < Cfg.NoSlvPorts; i++) begin : gen_xbar_slv_cross
for (genvar j = 0; j < Cfg.NoMstPorts; j++) begin : gen_xbar_mst_cross
assign mst_reqs[j][i] = slv_reqs[i][j];
assign slv_resps[i][j] = mst_resps[j][i];
end
end
for (genvar i = 0; i < Cfg.NoMstPorts; i++) begin : gen_mst_port_mux
axi_lite_mux #(
.aw_chan_t ( aw_chan_t ), // AW Channel Type
.w_chan_t ( w_chan_t ), // W Channel Type
.b_chan_t ( b_chan_t ), // B Channel Type
.ar_chan_t ( ar_chan_t ), // AR Channel Type
.r_chan_t ( r_chan_t ), // R Channel Type
.axi_req_t ( axi_req_t ),
.axi_resp_t ( axi_resp_t ),
.NoSlvPorts ( Cfg.NoSlvPorts ), // Number of Masters for the module
.MaxTrans ( Cfg.MaxSlvTrans ),
.FallThrough ( Cfg.FallThrough ),
.SpillAw ( Cfg.LatencyMode[4] ),
.SpillW ( Cfg.LatencyMode[3] ),
.SpillB ( Cfg.LatencyMode[2] ),
.SpillAr ( Cfg.LatencyMode[1] ),
.SpillR ( Cfg.LatencyMode[0] )
) i_axi_lite_mux (
.clk_i, // Clock
.rst_ni, // Asynchronous reset active low
.test_i, // Test Mode enable
.slv_reqs_i ( mst_reqs[i] ),
.slv_resps_o ( mst_resps[i] ),
.mst_req_o ( mst_ports_req_o[i] ),
.mst_resp_i ( mst_ports_resp_i[i] )
);
end
endmodule
`include "axi/assign.svh"
module axi_lite_xbar_intf #(
parameter axi_pkg::xbar_cfg_t Cfg = '0,
parameter type rule_t = axi_pkg::xbar_rule_64_t
) (
input logic clk_i,
input logic rst_ni,
input logic test_i,
AXI_LITE.Slave slv_ports [Cfg.NoSlvPorts-1:0],
AXI_LITE.Master mst_ports [Cfg.NoMstPorts-1:0],
input rule_t [Cfg.NoAddrRules-1:0] addr_map_i,
input logic [Cfg.NoSlvPorts-1:0] en_default_mst_port_i,
input logic [Cfg.NoSlvPorts-1:0][$clog2(Cfg.NoMstPorts)-1:0] default_mst_port_i
);
typedef logic [Cfg.AxiAddrWidth -1:0] addr_t;
typedef logic [Cfg.AxiDataWidth -1:0] data_t;
typedef logic [Cfg.AxiDataWidth/8 -1:0] strb_t;
`AXI_LITE_TYPEDEF_AW_CHAN_T(aw_chan_t, addr_t)
`AXI_LITE_TYPEDEF_W_CHAN_T(w_chan_t, data_t, strb_t)
`AXI_LITE_TYPEDEF_B_CHAN_T(b_chan_t)
`AXI_LITE_TYPEDEF_AR_CHAN_T(ar_chan_t, addr_t)
`AXI_LITE_TYPEDEF_R_CHAN_T(r_chan_t, data_t)
`AXI_LITE_TYPEDEF_REQ_T(axi_req_t, aw_chan_t, w_chan_t, ar_chan_t)
`AXI_LITE_TYPEDEF_RESP_T(axi_resp_t, b_chan_t, r_chan_t)
axi_req_t [Cfg.NoMstPorts-1:0] mst_reqs;
axi_resp_t [Cfg.NoMstPorts-1:0] mst_resps;
axi_req_t [Cfg.NoSlvPorts-1:0] slv_reqs;
axi_resp_t [Cfg.NoSlvPorts-1:0] slv_resps;
for (genvar i = 0; i < Cfg.NoMstPorts; i++) begin : gen_assign_mst
`AXI_LITE_ASSIGN_FROM_REQ(mst_ports[i], mst_reqs[i])
`AXI_LITE_ASSIGN_TO_RESP(mst_resps[i], mst_ports[i])
end
for (genvar i = 0; i < Cfg.NoSlvPorts; i++) begin : gen_assign_slv
`AXI_LITE_ASSIGN_TO_REQ(slv_reqs[i], slv_ports[i])
`AXI_LITE_ASSIGN_FROM_RESP(slv_ports[i], slv_resps[i])
end
axi_lite_xbar #(
.Cfg (Cfg),
.aw_chan_t ( aw_chan_t ),
.w_chan_t ( w_chan_t ),
.b_chan_t ( b_chan_t ),
.ar_chan_t ( ar_chan_t ),
.r_chan_t ( r_chan_t ),
.axi_req_t ( axi_req_t ),
.axi_resp_t ( axi_resp_t ),
.rule_t ( rule_t )
) i_xbar (
.clk_i,
.rst_ni,
.test_i,
.slv_ports_req_i (slv_reqs ),
.slv_ports_resp_o (slv_resps),
.mst_ports_req_o (mst_reqs ),
.mst_ports_resp_i (mst_resps),
.addr_map_i,
.en_default_mst_port_i,
.default_mst_port_i
);
endmodule