Re: gEDA-user: icarus verilog: IVL_LPM_CMP_EQ not supported by thistarget

[Ming Deng <ming.deng@kabenresearch.com>]

It seems to me that continuous assignment in "wire" statement

       wire try1 = (state_en == 5'd8);

is tended to be compiled into BUF, INV and AND gates while procedural 
assignment

   out<=(in==5'b00101);

or "if" statement in procedure 
   if (state_en == 5'b11111) begin

are tended to be compiled into LPM_COMPARE and LPM_CONSTANT devices. But 
unfortunately most LPM_COMPARE devices have  not been implemented yet.

Ming Deng




Stephen Williams wrote:

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> Ming Deng wrote:
> | I ran the sample file on Icarus Verilog 0.7, got the same result.
> |
> | After taking a briefly look into the code,  I found there were no any
> | comparators implemented for fpga-lpm. See the following snippet from
> | tgt-fpga/d-lpm.c
>
> The -tfpga -parch=virtex supports more stuff then the default
> LPM family. It's simply a matter of filling in the table that
> you discovered in the d-lpm.c source file.
>
> - --
> 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."
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