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Altera_Forum's avatar
Altera_Forum
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12 years ago

How to set content in a memory

............

5 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    12 years ago

    Thanks Alexandre,

    I've checked your suggestion, but what if I've 2 memories?

    Apparently, mif and hex just assign width and depth.

    How to appoint mif A and mif B?
  • Altera_Forum's avatar
    Altera_Forum
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    12 years ago

    Besides that,

    I've RAM infer, build in my project. Can I save a data on it in the same way with mif and hex?? 

    
module SRAM_INFERS(CLK, WA, WE, DI, RA, DO, RA0, DO0, RA1, DO1, RA2, DO2, RA3, DO3);
input CLK;
/* 256 bit Write port */
input WE;
input WA;
input  DI;
/* 256 bit Read port */
input RA;
input  DO;
/* 8 bit Read ports */
input  RA0, RA1;
input  RA2, RA3;
output  DO0, DO1;
output DO2, DO3;
wire  DO0_tmp, DO1_tmp, DO2_tmp, DO3_tmp, DO_tmp;
reg  DO0, DO1;
reg  DO2, DO3;
/* Memory */
reg  Mem ;
always @(posedge CLK)
begin
if(WE)
Mem = DI;
end
assign DO_tmp = Mem;
assign DO0_tmp = Mem];
assign DO1_tmp = Mem];
assign DO2_tmp = Mem];
assign DO3_tmp = Mem];
/* Subfield Extraction for 8 bit Read */
always @(DO0_tmp or RA0)
begin
casex(RA0)
5'b11111 : DO0 = DO0_tmp;
5'b11110 : DO0 = DO0_tmp;
5'b11101 : DO0 = DO0_tmp;
5'b11100 : DO0 = DO0_tmp;
5'b11011 : DO0 = DO0_tmp;
.
.
.
.
end
endmodule

    regards,
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    12 years ago

    That won't infer RAM due to asynchronous read.

    That said, you can initialize the RAM contents with a "inital" block and a $readmem function to read data from a file.

    Another way is to use a ATLSYNCRAM function and point the INIT_FILE parameter to a .MIF or .HEX file.