gEDA-user: icarus and dual-port rams

["Matt Ettus" <boyscout@gmail.com>]

I get the following errors when trying to compile a dual-ported ram in
icarus.  I'm sure my syntax must be bad somewhere, but I can't see
where.

duram.v:31: internal error: The indices are not constant for array ``ram''.
duram.v:36: error: Could not find variable ``ram'' in ``duram''
duram.v:37: error: Unable to bind wire/reg/memory `ram' in `duram'
duram.v:43: error: Could not find variable ``ram'' in ``duram''
duram.v:44: error: Unable to bind wire/reg/memory `ram' in `duram'
5 error(s) during elaboration.


The code follows:

module duram
 (data_a,
  data_b,
  wren_a,
  wren_b,
  address_a,
  address_b,
  clock_a,
  clock_b,
  q_a,
  q_b);

  parameter DATA_WIDTH = 32;
  parameter ADDR_WIDTH = 5;
  localparam ADDR_DEPTH = 2**ADDR_WIDTH;

  input [DATA_WIDTH-1:0] data_a;
  input 		  wren_a;
  input [ADDR_WIDTH-1:0] address_a;
  input 		  clock_a;
  output 		  reg [DATA_WIDTH-1:0] q_a;

  input [DATA_WIDTH-1:0] data_b;
  input 		  wren_b;
  input [ADDR_WIDTH-1:0] address_b;
  input 		  clock_b;
  output 		  reg [DATA_WIDTH-1:0] q_b;

  reg [DATA_WIDTH-1:0]   ram	[0:ADDR_DEPTH-1];

  always @(posedge clock_a)
    begin
	if(wren_a)
	  ram[address_a] <= data_a;
	q_a <= ram[address_a];
    end

  always @(posedge clock_b)
    begin
	if(wren_b)
	  ram[address_b] <= data_b;
	q_b <= ram[address_b];
    end

endmodule // duram


Thanks,
Matt


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