multidimensional RAM

[Altera_Forum]

hello everyone, 

 I am using altera DE2 cyclon II and quartusII 9.1 . I work on video frames and I need to store them in a two dimensional RAM. I wrote the code like this:    module memory (iCLK, we, a, b, idata, odata); input iCLK; //input iRST; input we; input [639:0] a; input [1279:0]b; input [9:0] idata; output [9:0] odata;   reg [9:0] memory [9:0][9:0]; integer j,k;  always@(posedge iCLK) begin  if (we)  begin  for(k = 0; k < 10; k = k +1)  for(j = 0; j < 10; j = j + 1)  memory[k][j] <= idata;  end end   assign odata = memory[a][b];  endmodule  but the problem is, compiler says there is not enough pins.  could any one help me? or have you another idea to do this.  thanks.

[Altera_Forum]

is this  

module memory (iCLK, we, a, b, idata, odata); your top level ?  if yes then you will need  1 pin for iCLK 1 pin for we 640 pins for a 1280 pins for b 10 pins for idata 10 pins for odata  this is a summ of 1942 io pins only for this module and not taken into account the pins for power supply. at least much more than the biggest part i knew.

[Altera_Forum]

you are exactly right. this is just a part of a project. 

I try to minimize the size of ram and writing on the old values. &#305; hope it works

[Altera_Forum]

Angela, 

Is your device just working as a RAM? Does 'a' and 'b' refer to address of the RAM? If yes then, do you really need such a high width for your RAM?

[Altera_Forum]

I think to minimize your ram is not your only problem. I´m quiet shure that you can minimize your code to odata = idata as far as you have written it and that´s not what it should do I think. So why don´t you use some of Altera´s altsyncram to build your array. I think that´s the easiest way to manage your problem.

[Altera_Forum]

There is another issue : 

   --- Quote Start ---   input [639:0] a; input [1279:0]b; reg [9:0] memory [9:0][9:0]; assign odata = memory[a][b];   --- Quote End ---    as you can see be inserting the definitions for a and b you will get    --- Quote Start ---   reg [9:0] memory [9:0][9:0]; assign odata = memory[639:0][1279:0];   --- Quote End ---    the read access to the memory uses a 640x1280 array, but the memory is instantiated only as a 10x10 array.