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axi_cut.sv
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axi_cut.sv
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// Copyright (c) 2014-2018 ETH Zurich, 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.
//
// Fabian Schuiki <[email protected]>
// Andreas Kurth <[email protected]>
/// An AXI4 cut.
///
/// Breaks all combinatorial paths between its input and output.
module axi_cut #(
// bypass enable
parameter bit Bypass = 1'b0,
// AXI channel structs
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,
// AXI request & response structs
parameter type req_t = logic,
parameter type resp_t = logic
) (
input logic clk_i,
input logic rst_ni,
// salve port
input req_t slv_req_i,
output resp_t slv_resp_o,
// master port
output req_t mst_req_o,
input resp_t mst_resp_i
);
// a spill register for each channel
spill_register #(
.T ( aw_chan_t ),
.Bypass ( Bypass )
) i_reg_aw (
.clk_i ( clk_i ),
.rst_ni ( rst_ni ),
.valid_i ( slv_req_i.aw_valid ),
.ready_o ( slv_resp_o.aw_ready ),
.data_i ( slv_req_i.aw ),
.valid_o ( mst_req_o.aw_valid ),
.ready_i ( mst_resp_i.aw_ready ),
.data_o ( mst_req_o.aw )
);
spill_register #(
.T ( w_chan_t ),
.Bypass ( Bypass )
) i_reg_w (
.clk_i ( clk_i ),
.rst_ni ( rst_ni ),
.valid_i ( slv_req_i.w_valid ),
.ready_o ( slv_resp_o.w_ready ),
.data_i ( slv_req_i.w ),
.valid_o ( mst_req_o.w_valid ),
.ready_i ( mst_resp_i.w_ready ),
.data_o ( mst_req_o.w )
);
spill_register #(
.T ( b_chan_t ),
.Bypass ( Bypass )
) i_reg_b (
.clk_i ( clk_i ),
.rst_ni ( rst_ni ),
.valid_i ( mst_resp_i.b_valid ),
.ready_o ( mst_req_o.b_ready ),
.data_i ( mst_resp_i.b ),
.valid_o ( slv_resp_o.b_valid ),
.ready_i ( slv_req_i.b_ready ),
.data_o ( slv_resp_o.b )
);
spill_register #(
.T ( ar_chan_t ),
.Bypass ( Bypass )
) i_reg_ar (
.clk_i ( clk_i ),
.rst_ni ( rst_ni ),
.valid_i ( slv_req_i.ar_valid ),
.ready_o ( slv_resp_o.ar_ready ),
.data_i ( slv_req_i.ar ),
.valid_o ( mst_req_o.ar_valid ),
.ready_i ( mst_resp_i.ar_ready ),
.data_o ( mst_req_o.ar )
);
spill_register #(
.T ( r_chan_t ),
.Bypass ( Bypass )
) i_reg_r (
.clk_i ( clk_i ),
.rst_ni ( rst_ni ),
.valid_i ( mst_resp_i.r_valid ),
.ready_o ( mst_req_o.r_ready ),
.data_i ( mst_resp_i.r ),
.valid_o ( slv_resp_o.r_valid ),
.ready_i ( slv_req_i.r_ready ),
.data_o ( slv_resp_o.r )
);
endmodule
`include "axi/assign.svh"
`include "axi/typedef.svh"
// interface wrapper
module axi_cut_intf #(
// Bypass eneable
parameter bit BYPASS = 1'b0,
// The address width.
parameter int unsigned ADDR_WIDTH = 0,
// The data width.
parameter int unsigned DATA_WIDTH = 0,
// The ID width.
parameter int unsigned ID_WIDTH = 0,
// The user data width.
parameter int unsigned USER_WIDTH = 0
) (
input logic clk_i ,
input logic rst_ni ,
AXI_BUS.Slave in ,
AXI_BUS.Master out
);
typedef logic [ID_WIDTH-1:0] id_t;
typedef logic [ADDR_WIDTH-1:0] addr_t;
typedef logic [DATA_WIDTH-1:0] data_t;
typedef logic [DATA_WIDTH/8-1:0] strb_t;
typedef logic [USER_WIDTH-1:0] user_t;
`AXI_TYPEDEF_AW_CHAN_T ( aw_chan_t, addr_t, id_t, user_t);
`AXI_TYPEDEF_W_CHAN_T ( w_chan_t, data_t, strb_t, user_t);
`AXI_TYPEDEF_B_CHAN_T ( b_chan_t, id_t, user_t);
`AXI_TYPEDEF_AR_CHAN_T ( ar_chan_t, addr_t, id_t, user_t);
`AXI_TYPEDEF_R_CHAN_T ( r_chan_t, data_t, id_t, user_t);
`AXI_TYPEDEF_REQ_T ( req_t, aw_chan_t, w_chan_t, ar_chan_t);
`AXI_TYPEDEF_RESP_T ( resp_t, b_chan_t, r_chan_t);
req_t slv_req, mst_req;
resp_t slv_resp, mst_resp;
`AXI_ASSIGN_TO_REQ ( slv_req, in );
`AXI_ASSIGN_FROM_RESP ( in, slv_resp );
`AXI_ASSIGN_FROM_REQ ( out , mst_req );
`AXI_ASSIGN_TO_RESP ( mst_resp, out );
axi_cut #(
.Bypass ( BYPASS ),
.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 ),
.req_t ( req_t ),
.resp_t ( resp_t )
) i_axi_cut (
.clk_i,
.rst_ni,
.slv_req_i ( slv_req ),
.slv_resp_o ( slv_resp ),
.mst_req_o ( mst_req ),
.mst_resp_i ( mst_resp )
);
// Check the invariants.
// pragma translate_off
`ifndef VERILATOR
initial begin
assert (ADDR_WIDTH > 0) else $fatal(1, "Wrong addr width parameter");
assert (DATA_WIDTH > 0) else $fatal(1, "Wrong data width parameter");
assert (ID_WIDTH > 0) else $fatal(1, "Wrong id width parameter");
assert (USER_WIDTH > 0) else $fatal(1, "Wrong user width parameter");
assert (in.AXI_ADDR_WIDTH == ADDR_WIDTH) else $fatal(1, "Wrong interface definition");
assert (in.AXI_DATA_WIDTH == DATA_WIDTH) else $fatal(1, "Wrong interface definition");
assert (in.AXI_ID_WIDTH == ID_WIDTH) else $fatal(1, "Wrong interface definition");
assert (in.AXI_USER_WIDTH == USER_WIDTH) else $fatal(1, "Wrong interface definition");
assert (out.AXI_ADDR_WIDTH == ADDR_WIDTH) else $fatal(1, "Wrong interface definition");
assert (out.AXI_DATA_WIDTH == DATA_WIDTH) else $fatal(1, "Wrong interface definition");
assert (out.AXI_ID_WIDTH == ID_WIDTH) else $fatal(1, "Wrong interface definition");
assert (out.AXI_USER_WIDTH == USER_WIDTH) else $fatal(1, "Wrong interface definition");
end
`endif
// pragma translate_on
endmodule
module axi_lite_cut_intf #(
// bypass enable
parameter bit BYPASS = 1'b0,
/// The address width.
parameter int unsigned ADDR_WIDTH = 0,
/// The data width.
parameter int unsigned DATA_WIDTH = 0
) (
input logic clk_i ,
input logic rst_ni ,
AXI_LITE.Slave in ,
AXI_LITE.Master out
);
typedef logic [ADDR_WIDTH-1:0] addr_t;
typedef logic [DATA_WIDTH-1:0] data_t;
typedef logic [DATA_WIDTH/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 ( req_t, aw_chan_t, w_chan_t, ar_chan_t)
`AXI_LITE_TYPEDEF_RESP_T ( resp_t, b_chan_t, r_chan_t)
req_t slv_req, mst_req;
resp_t slv_resp, mst_resp;
axi_cut #(
.Bypass ( BYPASS ),
.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 ),
.req_t ( req_t ),
.resp_t ( resp_t )
) i_axi_cut (
.clk_i,
.rst_ni,
.slv_req_i ( slv_req ),
.slv_resp_o ( slv_resp ),
.mst_req_o ( mst_req ),
.mst_resp_i ( mst_resp )
);
// Check the invariants.
// pragma translate_off
`ifndef VERILATOR
initial begin
assert (ADDR_WIDTH > 0) else $fatal(1, "Wrong addr width parameter");
assert (DATA_WIDTH > 0) else $fatal(1, "Wrong data width parameter");
assert (in.AXI_ADDR_WIDTH == ADDR_WIDTH) else $fatal(1, "Wrong interface definition");
assert (in.AXI_DATA_WIDTH == DATA_WIDTH) else $fatal(1, "Wrong interface definition");
assert (out.AXI_ADDR_WIDTH == ADDR_WIDTH) else $fatal(1, "Wrong interface definition");
assert (out.AXI_DATA_WIDTH == DATA_WIDTH) else $fatal(1, "Wrong interface definition");
end
`endif
// pragma translate_on
endmodule