Download: sramtest.zip
This project tests the SRAM chip on the DE2 board.
KEY3sets the address from the toggle switches. The result is displayed in HEX7:HEX4. The contents of that memory address is shown in HEX3:HEX0.
KEY2writes the data value from the toggle switches to the current address.
sramtest.v
module sramtest( // Clock Input (50 MHz) input CLOCK_50, // Push Buttons input [3:0] KEY, // DPDT Switches input [17:0] SW, // 7-SEG Displays output [6:0] HEX0, HEX1, HEX2, HEX3, HEX4, HEX5, HEX6, HEX7, // LEDs output [8:0] LEDG, // LED Green[8:0] output [17:0] LEDR, // LED Red[17:0] // SRAM Interface inout [15:0] SRAM_DQ, // SRAM Data bus 16 Bits output [17:0] SRAM_ADDR, // SRAM Address bus 18 Bits output SRAM_UB_N, // SRAM High-byte Data Mask output SRAM_LB_N, // SRAM Low-byte Data Mask output SRAM_WE_N, // SRAM Write Enable output SRAM_CE_N, // SRAM Chip Enable output SRAM_OE_N, // SRAM Output Enable // GPIO Connections inout [35:0] GPIO_0, GPIO_1 ); // set all inout ports to tri-state assign GPIO_0 = 36'hzzzzzzzzz; assign GPIO_1 = 36'hzzzzzzzzz; wire RST; assign RST = KEY[0]; // Turn off green LEDS assign LEDG[8:0] = 0; // Connect dip switches to red LEDS assign LEDR[17:0] = SW[17:0]; reg [15:0] mem_in; wire [15:0] mem_out; reg [17:0] mem_address; assign SRAM_ADDR = mem_address; assign SRAM_UB_N = 1'b0; // SRAM High-byte Data Mask assign SRAM_LB_N = 1'b0; // SRAM Low-byte Data Mask assign SRAM_CE_N = 1'b0; // SRAM Chip Enable assign SRAM_OE_N = 1'b0; // SRAM Output Enable // map to 7-segment displays hex_7seg dsp0(mem_out[3:0],HEX0); hex_7seg dsp1(mem_out[7:4],HEX1); hex_7seg dsp2(mem_out[11:8],HEX2); hex_7seg dsp3(mem_out[15:12],HEX3); hex_7seg dsp4(mem_address[3:0],HEX4); hex_7seg dsp5(mem_address[7:4],HEX5); hex_7seg dsp6(mem_address[11:8],HEX6); hex_7seg dsp7(mem_address[15:12],HEX7); always @(negedge KEY[3]) mem_address <= SW; reg state; parameter idle = 1'b0, write = 1'b1; assign SRAM_WE_N = (state != write); assign SRAM_DQ = (state==write? mem_in: 16'hzzzz); assign mem_out = SRAM_DQ; always @(posedge CLOCK_50, negedge KEY[2]) if (!KEY[2]) begin state <= write; mem_in <= SW[15:0]; end else state <= idle; endmodule
hex_7seg.v
module hex_7seg(hex_digit,seg); input [3:0] hex_digit; output [6:0] seg; reg [6:0] seg; // seg = {g,f,e,d,c,b,a}; // 0 is on and 1 is off always @ (hex_digit) case (hex_digit) 4'h0: seg = 7'b1000000; 4'h1: seg = 7'b1111001; // ---a---- 4'h2: seg = 7'b0100100; // | | 4'h3: seg = 7'b0110000; // f b 4'h4: seg = 7'b0011001; // | | 4'h5: seg = 7'b0010010; // ---g---- 4'h6: seg = 7'b0000010; // | | 4'h7: seg = 7'b1111000; // e c 4'h8: seg = 7'b0000000; // | | 4'h9: seg = 7'b0011000; // ---d---- 4'ha: seg = 7'b0001000; 4'hb: seg = 7'b0000011; 4'hc: seg = 7'b1000110; 4'hd: seg = 7'b0100001; 4'he: seg = 7'b0000110; 4'hf: seg = 7'b0001110; endcase endmodule
fit.summary
Fitter Status : Successful - Tue Jul 17 12:30:44 2007 Quartus II Version : 6.0 Build 178 04/27/2006 SJ Full Version Revision Name : sramtest Top-level Entity Name : sramtest Family : Cyclone II Device : EP2C35F672C6 Timing Models : Final Total logic elements : 75 / 33,216 ( < 1 % ) Total registers : 19 Total pins : 217 / 475 ( 46 % ) Total virtual pins : 0 Total memory bits : 0 / 483,840 ( 0 % ) Embedded Multiplier 9-bit elements : 0 / 70 ( 0 % ) Total PLLs : 0 / 4 ( 0 % )
tan.summary
-------------------------------------------------------------------------------------- Timing Analyzer Summary -------------------------------------------------------------------------------------- Type : Worst-case tsu Slack : N/A Required Time : None Actual Time : 5.197 ns From : SW[14] To : mem_in[14] From Clock : -- To Clock : KEY[2] Failed Paths : 0 Type : Worst-case tco Slack : N/A Required Time : None Actual Time : 9.738 ns From : mem_address[8] To : HEX6[3] From Clock : KEY[3] To Clock : -- Failed Paths : 0 Type : Worst-case tpd Slack : N/A Required Time : None Actual Time : 11.098 ns From : SRAM_DQ[5] To : HEX1[6] From Clock : -- To Clock : -- Failed Paths : 0 Type : Worst-case th Slack : N/A Required Time : None Actual Time : 0.109 ns From : SW[10] To : mem_address[10] From Clock : -- To Clock : KEY[3] Failed Paths : 0 Type : Total number of failed paths Slack : Required Time : Actual Time : From : To : From Clock : To Clock : Failed Paths : 0 --------------------------------------------------------------------------------------
Maintained by John Loomis, last updated Tue Jul 17 14:46:45 2007