pleez,, URGENT!! about loops in verilog?

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Hey all;

I'm trien to write a loop in verilog to initialize all the entries in an array of 128 to a value of zero,

and I'm having the following error:

procedural continuous assignment to register is not supported

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here is my code ::

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// Instruction Memory

module imem(clk, reset, wr_enable,fetch_enable, mem_out, address, mem_in);

input clk;

input reset;

input wr_enable;

input fetch_enable; // this will control startin or stopin running stored commands

input [4:0] address;

output [31:0]mem_out;

input [31:0]mem_in;

reg [31 :0]mem_out;

reg [31 :0]array_reg[127:0]; //can save 128 instruction

integer i;

initial

while(i< 128)

begin

assign i = i+1;

mem_out<= 32'hfffff;

end

always @(posedge clk)

begin

if(fetch_enable)

begin

if (reset)

begin

mem_out <= 32'd0;

end

else

if(!wr_enable)

begin

mem_out <= array_reg[address];

end

else

array_reg[address] <= mem_in;

end

end

endmodule

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thaanks in advance :)

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hi,

you are using the assign statement with an integer. that's not allowed.

assign i = i+1 --> change to i = i + 1;

do really want to initialize "mem_out". "mem_out" is already set to a defined state

with the reset signal.

in case you would like to init your ram "array_reg" change your code to :

integer i;

integer p;

initial

begin

i = i+1;

p = 128;

for (i=0; i<p; i=i+1)

array_reg<= 32'hffffffff;

end

Using "while" is not recommended.

Have a look into the "db" folder. You will find a so-called <>.mif file. Look into the file and you could see the init values for the ram.

Kind regards

GPK