Re: gEDA-user: icarus 0.8 code gen doesn't like my design -- anyone seen this error?

[Alex Perry <alex.perry@xxxxxxxx>]

You can substitute their module with yours, using the search order parameter.
Change your version so that it is a bus width memory instead of bit width.
If you actually need the bitslice capability of that code, do it afterward.


> I managed to reproduce this one with a simple testcase:
> 
> module junk (clk);
>     input clk;
> 
>     parameter depth = 10240;
>     parameter width = 36;
> 
>     reg [depth*width-1:0] mem;
> 
>     reg [31:0] 		 foo;
>     reg [31:0] 		 bar;
> 
>     always @(posedge clk) begin
>       foo <= mem >> bar;
>     end
> endmodule
> 
> Compiling this module gives me:
> 
> ivl: vector.c:86: allocate_vector: Assertion `(base + idx) < (256*1024)' failed.
> 
> If I reduce the size of the mem vector then it works. The bad news for me is 
> that my problem code is inside a Xilinx block RAM library cell, so I can't just 
> code around it without changing the RAM configuration of the design :(.
> 
>     Mark
> 
> 
> Stephen Williams wrote:
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> > 
> > Mark Schellhorn wrote:
> > | I'm trying to debug the following error message from iverilog when
> > | compiling my design with icarus v0.8.1:
> > |
> > | CODE GENERATION -t dll
> > |  ... invoking target_design
> > | ivl: vector.c:86: allocate_vector: Assertion `(base + idx) < (256*1024)'
> > | failed.
> > |
> > | It looks like maybe a vector is too large and causes a run-time error?
> > | I've gone thru the code and reduced my large vectors one-by-one to see
> > | if that fixed things but the problem still occurs.
> > 
> > No one's reported this sort of error to me before, and it does indeed
> > look like there is a vector being processed that is too wide, although
> > it may also be a case of a allocate_vector bit leak.
> > 
> > - --
> > Steve Williams                "The woods are lovely, dark and deep.
> > steve at icarus.com           But I have promises to keep,
> > http://www.icarus.com         and lines to code before I sleep,
> > http://www.picturel.com       And lines to code before I sleep."
> > -----BEGIN PGP SIGNATURE-----
> > Version: GnuPG v1.2.5 (GNU/Linux)
> > Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org
> > 
> > iD8DBQFCNv+HrPt1Sc2b3ikRAm14AJ49wg7mCrafdv7/qMzNc55G0frDAwCg3WEi
> > yPbQDSZgk5vIfFZsoUE9tm0=
> > =G2d1
> > -----END PGP SIGNATURE-----
> > 
>