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//
// Copyright 2011 Ettus Research LLC
// Copyright 2018 Ettus Research, a National Instruments Company
//
// SPDX-License-Identifier: LGPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
// Instantiate this block at the core level to conduct closed
// loop testing of the AC performance of the USRP2 SRAM interface
`define WIDTH 18
`define DEPTH 19
module test_sram_if
(
input clk,
input rst,
input [`WIDTH-1:0] RAM_D_pi,
output [`WIDTH-1:0] RAM_D_po,
output RAM_D_poe,
output [`DEPTH-1:0] RAM_A,
output RAM_WEn,
output RAM_CENn,
output RAM_LDn,
output RAM_OEn,
output RAM_CE1n,
output reg correct
);
reg [`DEPTH-1:0] write_count;
reg [`DEPTH-1:0] read_count;
reg enable;
reg write;
reg write_cycle;
reg read_cycle;
reg enable_reads;
reg [18:0] address;
reg [17:0] data_out;
wire [17:0] data_in;
wire data_in_valid;
reg [17:0] check_data;
reg [17:0] check_data_old;
reg [17:0] check_data_old2;
//
// Create counter that generates both external modulo 2^19 address and modulo 2^18 data to test RAM.
//
always @(posedge clk)
if (rst)
begin
write_count <= 19'h0;
read_count <= 19'h0;
end
else if (write_cycle) // Write cycle
if (write_count == 19'h7FFFF)
begin
write_count <= 19'h0;
end
else
begin
write_count <= write_count + 1'b1;
end
else if (read_cycle) // Read cycle
if (read_count == 19'h7FFFF)
begin
read_count <= 19'h0;
end
else
begin
read_count <= read_count + 1'b1;
end
always @(posedge clk)
if (rst)
begin
enable_reads <= 0;
read_cycle <= 0;
write_cycle <= 0;
end
else
begin
write_cycle <= ~write_cycle;
if (enable_reads)
read_cycle <= write_cycle;
if (write_count == 15) // Enable reads 15 writes after reset terminates.
enable_reads <= 1;
end // else: !if(rst)
always @(posedge clk)
if (rst)
begin
enable <= 0;
end
else if (write_cycle)
begin
address <= write_count;
data_out <= write_count[17:0];
enable <= 1;
write <= 1;
end
else if (read_cycle)
begin
address <= read_count;
check_data <= read_count[17:0];
check_data_old <= check_data;
check_data_old2 <= check_data_old;
enable <= 1;
write <= 0;
end
else
enable <= 0;
always @(posedge clk)
if (data_in_valid)
begin
correct <= (data_in == check_data_old2);
end
nobl_if nobl_if_i1
(
.clk(clk),
.rst(rst),
.RAM_D_pi(RAM_D_pi),
.RAM_D_po(RAM_D_po),
.RAM_D_poe(RAM_D_poe),
.RAM_A(RAM_A),
.RAM_WEn(RAM_WEn),
.RAM_CENn(RAM_CENn),
.RAM_LDn(RAM_LDn),
.RAM_OEn(RAM_OEn),
.RAM_CE1n(RAM_CE1n),
.address(address),
.data_out(data_out),
.data_in(data_in),
.data_in_valid(data_in_valid),
.write(write),
.enable(enable)
);
wire [35:0] CONTROL0;
reg [7:0] data_in_reg, data_out_reg, address_reg;
reg data_in_valid_reg,write_reg,enable_reg,correct_reg;
always @(posedge clk)
begin
data_in_reg <= data_in[7:0];
data_out_reg <= data_out[7:0];
data_in_valid_reg <= data_in_valid;
write_reg <= write;
enable_reg <= enable;
correct_reg <= correct;
address_reg <= address;
end
icon icon_i1
(
.CONTROL0(CONTROL0)
);
ila ila_i1
(
.CLK(clk),
.CONTROL(CONTROL0),
// .TRIG0(address_reg),
.TRIG0(data_in_reg[7:0]),
.TRIG1(data_out_reg[7:0]),
.TRIG2(address_reg[7:0]),
.TRIG3({data_in_valid_reg,write_reg,enable_reg,correct_reg})
);
endmodule // test_sram_if
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