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Diffstat (limited to 'fpga/usrp2/extramfifo/test_sram_if.v')
| -rw-r--r-- | fpga/usrp2/extramfifo/test_sram_if.v | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/fpga/usrp2/extramfifo/test_sram_if.v b/fpga/usrp2/extramfifo/test_sram_if.v new file mode 100644 index 000000000..dcb881a92 --- /dev/null +++ b/fpga/usrp2/extramfifo/test_sram_if.v @@ -0,0 +1,192 @@ +// +// Copyright 2011 Ettus Research LLC +// +// 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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