mirror of https://github.com/efabless/caravel.git
49 lines
1.5 KiB
Coq
49 lines
1.5 KiB
Coq
|
// SPDX-FileCopyrightText: 2020 Efabless Corporation
|
||
|
|
//
|
||
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
// you may not use this file except in compliance with the License.
|
||
|
|
// You may obtain a copy of the License at
|
||
|
|
//
|
||
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
//
|
||
|
|
// Unless required by applicable law or agreed to in writing, software
|
||
|
|
// distributed under the 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.
|
||
|
|
// SPDX-License-Identifier: Apache-2.0
|
||
|
|
|
||
|
|
`default_nettype none
|
||
|
|
module dummy_slave(
|
||
|
|
input wb_clk_i,
|
||
|
|
input wb_rst_i,
|
||
|
|
|
||
|
|
input wb_stb_i,
|
||
|
|
input wb_cyc_i,
|
||
|
|
input wb_we_i,
|
||
|
|
input [3:0] wb_sel_i,
|
||
|
|
input [31:0] wb_adr_i,
|
||
|
|
input [31:0] wb_dat_i,
|
||
|
|
|
||
|
|
output reg [31:0] wb_dat_o,
|
||
|
|
output reg wb_ack_o
|
||
|
|
);
|
||
|
|
reg [31:0] store;
|
||
|
|
|
||
|
|
wire valid = wb_cyc_i & wb_stb_i;
|
||
|
|
|
||
|
|
always @(posedge wb_clk_i) begin
|
||
|
|
if (wb_rst_i == 1'b 1) begin
|
||
|
|
wb_ack_o <= 1'b 0;
|
||
|
|
end else begin
|
||
|
|
if (wb_we_i == 1'b 1) begin
|
||
|
|
if (wb_sel_i[0]) store[7:0] <= wb_dat_i[7:0];
|
||
|
|
if (wb_sel_i[1]) store[15:8] <= wb_dat_i[15:8];
|
||
|
|
if (wb_sel_i[2]) store[23:16] <= wb_dat_i[23:16];
|
||
|
|
if (wb_sel_i[3]) store[31:24] <= wb_dat_i[31:24];
|
||
|
|
end
|
||
|
|
wb_dat_o <= store;
|
||
|
|
wb_ack_o <= valid & !wb_ack_o;
|
||
|
|
end
|
||
|
|
end
|
||
|
|
endmodule
|