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// SPDX-License-Identifier: Apache-2.0
// Copyright 2019 Peter Gustavsson <peter.gustavsson@qamcom.se>
//
// 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.
//********************************************************************************
// $Id$
//
// Function: AXI lite to Wishbone non pipelined bridge
// Comments: Assumes single accesses to a 32bit register on an 64bit aligned address
//
//********************************************************************************
`default_nettype none
module axi2wb
#(parameter AW = 12,
parameter IW = 0)
(
input wire i_clk,
input wire i_rst,
// Wishbone master
output reg [AW-1:2] o_wb_adr,
output reg [31:0] o_wb_dat,
output reg [3:0] o_wb_sel,
output reg o_wb_we,
output reg o_wb_cyc,
output reg o_wb_stb,
input wire [31:0] i_wb_rdt,
input wire i_wb_ack,
input wire i_wb_err,
// AXI slave
// AXI adress write channel
input wire [AW-1:0] i_awaddr,
input wire [IW-1:0] i_awid,
input wire i_awvalid,
output reg o_awready,
//AXI adress read channel
input wire [AW-1:0] i_araddr,
input wire [IW-1:0] i_arid,
input wire i_arvalid,
output reg o_arready,
//AXI write channel
input wire [63:0] i_wdata,
input wire [7:0] i_wstrb,
input wire i_wvalid,
output reg o_wready,
//AXI response channel
output reg [IW-1:0] o_bid,
output wire [1:0] o_bresp,
output reg o_bvalid,
input wire i_bready,
//AXI read channel
output reg [63:0] o_rdata,
output reg [IW-1:0] o_rid,
output wire [1:0] o_rresp,
output wire o_rlast,
output reg o_rvalid,
input wire i_rready
);
assign o_bresp = 2'b00;
assign o_rresp = 2'b00;
assign o_rlast = 1'b1;
reg hi_32b_w;
reg arbiter;
reg [31:0] wb_rdt_low;
parameter STATESIZE = 4;
parameter [STATESIZE-1:0]
IDLE = 4'd0,
AWACK = 4'd1,
WBWACK= 4'd2,
WBRACK1 = 4'd3,
WBR2 = 4'd4,
WBRACK2 = 4'd5,
BAXI = 4'd6,
RRAXI = 4'd7;
reg [STATESIZE-1:0] cs;
// formal helper registers
reg aw_req;
reg w_req;
reg ar_req;
initial o_rvalid = 1'b0;
initial o_bvalid = 1'b0;
initial o_wb_stb = 1'b0;
initial o_wb_cyc = 1'b0;
initial o_wb_we = 1'b0;
initial cs = 4'd0;
initial aw_req = 1'b0;
initial w_req = 1'b0;
initial ar_req = 1'b0;
always @(posedge i_clk) begin
if (i_rst) begin
o_awready <= 1'b0;
o_wready <= 1'b0;
o_arready <= 1'b0;
o_rvalid <= 1'b0;
o_bvalid <= 1'b0;
o_wb_adr <= {AW-2{1'b0}};
o_wb_cyc <= 1'b0;
o_wb_stb <= 1'b0;
o_wb_sel <= 4'd0;
o_wb_we <= 1'b0;
arbiter <= 1'b1;
wb_rdt_low <= 32'hDEADBEEF;
cs <= IDLE;
aw_req <= 1'b0;
w_req <= 1'b0;
ar_req <= 1'b0;
o_bid <= {IW{1'b0}};
o_rid <= {IW{1'b0}};
end
else begin
if (i_awvalid & o_awready)
o_bid <= i_awid;
if (i_arvalid & o_arready)
o_rid <= i_arid;
o_awready <= 1'b0;
o_wready <= 1'b0;
o_arready <= 1'b0;
if (i_awvalid && o_awready)
aw_req <= 1'b1;
else if (i_bready && o_bvalid)
aw_req <= 1'b0;
if (i_wvalid && o_wready)
w_req <= 1'b1;
else if (i_bready && o_bvalid)
w_req <= 1'b0;
if (i_arvalid && o_arready)
ar_req <= 1'b1;
else if (i_rready && o_rvalid)
ar_req <= 1'b0;
case (cs)
IDLE : begin
arbiter <= 1'b1;
if (i_awvalid && arbiter) begin
o_wb_adr[AW-1:3] <= i_awaddr[AW-1:3];
o_awready <= 1'b1;
arbiter <= 1'b0;
if (i_wvalid) begin
hi_32b_w = (i_wstrb[3:0] == 4'h0) ? 1'b1 : 1'b0;
o_wb_adr[2] <= hi_32b_w;
o_wb_cyc <= 1'b1;
o_wb_stb <= 1'b1;
o_wb_sel <= hi_32b_w ? i_wstrb[7:4] : i_wstrb[3:0];
o_wb_dat <= hi_32b_w ? i_wdata[63:32] : i_wdata[31:0];
o_wb_we <= 1'b1;
o_wready <= 1'b1;
cs <= WBWACK;
end
else begin
cs <= AWACK;
end
end
else if (i_arvalid) begin
o_wb_adr[AW-1:2] <= i_araddr[AW-1:2];
o_wb_sel <= 4'hF;
o_wb_cyc <= 1'b1;
o_wb_stb <= 1'b1;
o_arready <= 1'b1;
cs <= WBRACK1;
end
end
AWACK : begin
if (i_wvalid) begin
hi_32b_w = (i_wstrb[3:0] == 4'h0) ? 1'b1 : 1'b0;
o_wb_adr[2] <= hi_32b_w;
o_wb_cyc <= 1'b1;
o_wb_stb <= 1'b1;
o_wb_sel <= hi_32b_w ? i_wstrb[7:4] : i_wstrb[3:0];
o_wb_dat <= hi_32b_w ? i_wdata[63:32] : i_wdata[31:0];
o_wb_we <= 1'b1;
o_wready <= 1'b1;
cs <= WBWACK;
end
end
WBWACK : begin
if ( i_wb_err || i_wb_ack ) begin
o_wb_cyc <= 1'b0;
o_wb_stb <= 1'b0;
o_wb_sel <= 4'h0;
o_wb_we <= 1'b0;
o_bvalid <= 1'b1;
cs <= BAXI;
end
end
WBRACK1 : begin
if ( i_wb_err || i_wb_ack) begin
o_wb_cyc <= 1'b0;
o_wb_stb <= 1'b0;
o_wb_sel <= 4'h0;
wb_rdt_low <= i_wb_rdt;
cs <= WBR2;
end
end
WBR2 : begin
o_wb_adr[2] <= 1'b1;
o_wb_sel <= 4'hF;
o_wb_cyc <= 1'b1;
o_wb_stb <= 1'b1;
cs <= WBRACK2;
end
WBRACK2 : begin
if ( i_wb_err || i_wb_ack) begin
o_wb_cyc <= 1'b0;
o_wb_stb <= 1'b0;
o_wb_sel <= 4'h0;
o_rvalid <= 1'b1;
o_rdata <= {i_wb_rdt, wb_rdt_low};
cs <= RRAXI;
end
end
BAXI : begin
o_bvalid <= 1'b1;
if (i_bready) begin
o_bvalid <= 1'b0;
cs <= IDLE;
end
end
RRAXI : begin
o_rvalid <= 1'b1;
if (i_rready) begin
o_rvalid <= 1'b0;
cs <= IDLE;
end
end
default : begin
o_awready <= 1'b0;
o_wready <= 1'b0;
o_arready <= 1'b0;
o_rvalid <= 1'b0;
o_bvalid <= 1'b0;
o_wb_adr <= {AW-2{1'b0}};
o_wb_cyc <= 1'b0;
o_wb_stb <= 1'b0;
o_wb_sel <= 4'd0;
o_wb_we <= 1'b0;
arbiter <= 1'b1;
cs <= IDLE;
end
endcase
end
end
`ifdef FORMAL
localparam F_LGDEPTH = 4;
wire [(F_LGDEPTH-1):0] faxi_awr_outstanding,
faxi_wr_outstanding,
faxi_rd_outstanding;
faxil_slave
#(
.C_AXI_DATA_WIDTH(64),
.C_AXI_ADDR_WIDTH(AW),
.F_OPT_BRESP (1'b1),
.F_OPT_RRESP (1'b1),
.F_AXI_MAXWAIT (16),
.F_AXI_MAXDELAY (4),
.F_AXI_MAXRSTALL (1),
.F_LGDEPTH(F_LGDEPTH))
faxil_slave
(
.i_clk(i_clk),
.i_axi_reset_n(~i_rst),
//
.i_axi_awaddr(i_awaddr),
.i_axi_awcache(4'h0),
.i_axi_awprot(3'd0),
.i_axi_awvalid(i_awvalid),
.i_axi_awready(o_awready),
//
.i_axi_wdata(i_wdata),
.i_axi_wstrb(i_wstrb),
.i_axi_wvalid(i_wvalid),
.i_axi_wready(o_wready),
//
.i_axi_bresp(2'd0),
.i_axi_bvalid(o_bvalid),
.i_axi_bready(i_bready),
//
.i_axi_araddr(i_araddr),
.i_axi_arprot(3'd0),
.i_axi_arcache(4'h0),
.i_axi_arvalid(i_arvalid),
.i_axi_arready(o_arready),
//
.i_axi_rdata(o_rdata),
.i_axi_rresp(2'd0),
.i_axi_rvalid(o_rvalid),
.i_axi_rready(i_rready),
//
.f_axi_rd_outstanding(faxi_rd_outstanding),
.f_axi_wr_outstanding(faxi_wr_outstanding),
.f_axi_awr_outstanding(faxi_awr_outstanding));
always @(*) begin
assert(faxi_awr_outstanding <= 1);
assert(faxi_wr_outstanding <= 1);
assert(faxi_rd_outstanding <= 1);
case (cs)
IDLE : begin
assert(!o_wb_we);
assert(!o_wb_stb);
assert(!o_wb_cyc);
assert(!aw_req);
assert(!ar_req);
assert(!w_req);
assert(faxi_awr_outstanding == 0);
assert(faxi_wr_outstanding == 0);
assert(faxi_rd_outstanding == 0);
end
AWACK : begin
assert(!o_wb_we);
assert(!o_wb_stb);
assert(!o_wb_cyc);
assert(faxi_awr_outstanding == (aw_req ? 1:0));
assert(faxi_wr_outstanding == 0);
assert(faxi_rd_outstanding == 0);
end
WBWACK : begin
assert(faxi_awr_outstanding == (aw_req ? 1:0));
assert(faxi_wr_outstanding == (w_req ? 1:0));
assert(faxi_rd_outstanding == 0);
end
WBRACK : begin
assert(faxi_awr_outstanding == 0);
assert(faxi_wr_outstanding == 0);
assert(faxi_rd_outstanding == (ar_req ? 1:0));
end
BAXI : begin
assert(faxi_rd_outstanding == 0);
end
RRAXI : begin
assert(faxi_awr_outstanding == 0);
assert(faxi_wr_outstanding == 0);
end
default:
assert(0);
endcase // case (cs)
end
fwbc_master
#(.AW (AW-2),
.DW (32),
.F_MAX_DELAY (4),
.OPT_BUS_ABORT (0))
fwbc_master
(.i_clk (i_clk),
.i_reset (i_rst),
.i_wb_addr (o_wb_adr),
.i_wb_data (o_wb_dat),
.i_wb_sel (o_wb_sel),
.i_wb_we (o_wb_we),
.i_wb_cyc (o_wb_cyc),
.i_wb_stb (o_wb_stb),
.i_wb_cti (3'd0),
.i_wb_bte (2'd0),
.i_wb_idata (i_wb_rdt),
.i_wb_ack (i_wb_ack),
.i_wb_err (i_wb_err),
.i_wb_rty (1'b0));
`endif
endmodule
`default_nettype wire