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Improve quickstart memory example

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This commit is contained in:
Clifford Wolf 2017-01-30 12:04:59 +01:00
parent f49cd7c1a0
commit 9064f7e6f6
1 changed files with 19 additions and 16 deletions
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35
docs/examples/quickstart/memory.v
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@ -1,6 +1,6 @@
module testbench (
input clk, wen,
input [15:0] addr,
input [9:0] addr,
input [7:0] wdata,
output [7:0] rdata
);
@ -12,7 +12,7 @@ module testbench (
.rdata(rdata)
);
wire [15:0] test_addr = $anyconst;
wire [9:0] test_addr = $anyconst;
reg test_data_valid = 0;
reg [7:0] test_data;
@ -31,27 +31,30 @@ endmodule
module memory (
input clk, wen,
input [15:0] addr,
input [9:0] addr,
input [7:0] wdata,
output [7:0] rdata
);
reg [7:0] bank0 [0:'h3fff];
reg [7:0] bank1 [0:'h3fff];
reg [7:0] bank2 [0:'h3fff];
reg [7:0] bank3 [0:'h3fff];
reg [7:0] bank0 [0:255];
reg [7:0] bank1 [0:255];
reg [7:0] bank2 [0:255];
reg [7:0] bank3 [0:255];
wire [1:0] mem_sel = addr[9:8];
wire [7:0] mem_addr = addr[7:0];
always @(posedge clk) begin
case (addr[15:14])
0: if (wen) bank0[addr[13:0]] <= wdata;
1: if (wen) bank1[addr[13:0]] <= wdata;
2: if (wen) bank1[addr[13:0]] <= wdata; // BUG: Should assign to bank2
3: if (wen) bank3[addr[13:0]] <= wdata;
case (mem_sel)
0: if (wen) bank0[mem_addr] <= wdata;
1: if (wen) bank1[mem_addr] <= wdata;
2: if (wen) bank1[mem_addr] <= wdata; // BUG: Should assign to bank2
3: if (wen) bank3[mem_addr] <= wdata;
endcase
end
assign rdata =
addr[15:14] == 0 ? bank0[addr[13:0]] :
addr[15:14] == 1 ? bank1[addr[13:0]] :
addr[15:14] == 2 ? bank2[addr[13:0]] :
addr[15:14] == 3 ? bank3[addr[13:0]] : 'bx;
mem_sel == 0 ? bank0[mem_addr] :
mem_sel == 1 ? bank1[mem_addr] :
mem_sel == 2 ? bank2[mem_addr] :
mem_sel == 3 ? bank3[mem_addr] : 'bx;
endmodule