Re: [partial-reconfig] Bus macro doubt

[<jedward@xxxxxxxxxx>]

Hi,

You only have to colocate the bus macro in the desired position in your
virtex-II, because it´s for the virtex family and not depends of size of
device. The position is defined in the *.ucf file.
You shows the xdl file:

 >  inst "t1A_(3)" "TBUF" , placed R24C7 TBUF_X12Y0 ,
>   cfg "TINV::T IINV::I _SUPERBEL::TRUE"
>   ;
>  inst "t1E_(3)" "TBUF" , placed R24C9 TBUF_X16Y0 ,
>   cfg "TINV::T IINV::I _SUPERBEL::TRUE"
>   ;
>  inst "t2B_(2)" "TBUF" , placed R24C7 TBUF_X12Y1 ,
>   cfg "TINV::T IINV::I _SUPERBEL::TRUE"
>   ;
>  inst "t2F_(2)" "TBUF" , placed R24C9 TBUF_X16Y1 ,
>   cfg "TINV::T IINV::I _SUPERBEL::TRUE"
>   ;
>  inst "t3C_(1)" "TBUF" , placed R24C8 TBUF_X14Y0 ,
>   cfg "TINV::T IINV::I _SUPERBEL::TRUE"
>   ;
>  inst "t3G_(1)" "TBUF" , placed R24C10 TBUF_X18Y0 ,
>   cfg "TINV::T IINV::I _SUPERBEL::TRUE"
>   ;
>  inst "t4D_(0)" "TBUF" , placed R24C8 TBUF_X14Y1 ,
>   cfg "TINV::T IINV::I _SUPERBEL::TRUE"
>   ;
>  inst "t4H_(0)" "TBUF" , placed R24C10 TBUF_X18Y1 ,
>   cfg "TINV::T IINV::I _SUPERBEL::TRUE"


You dont need modify this file!!. People modify this file when they want a
custom bus macro, for example i modify this file to obtain a bus macro of
different size (12 CLB´s).
I hope answer your question.

John Esquiagola



> Hi people,
> I'm trying to develop a partial reconfigurable system based on a
> Virtex-II 2000 FPGA.
> I've read the Xilinx 290 Application Note, following the Tutorial
> provided by Grégory Mermoud.
> Now I've a doubt about bus macro, and I apologize if the answer to my
> question could result obvious, but I'm newbie in this branch, so
> forgive  me :)
> The bus macro file provided with App290 seems to be designed for a 250
> device, and in this mailing list I found e bus macro for a 1000 device.
> Can I find macros for my virtex? I didn't find anything on Xilinx
> website. So, I think I have to describe a macro for my FPGA.
>
> In Xilinx bus macro file I find:
>  inst "t1A_(3)" "TBUF" , placed R24C7 TBUF_X12Y0 ,
>   cfg "TINV::T IINV::I _SUPERBEL::TRUE"
>   ;
>  inst "t1E_(3)" "TBUF" , placed R24C9 TBUF_X16Y0 ,
>   cfg "TINV::T IINV::I _SUPERBEL::TRUE"
>   ;
>  inst "t2B_(2)" "TBUF" , placed R24C7 TBUF_X12Y1 ,
>   cfg "TINV::T IINV::I _SUPERBEL::TRUE"
>   ;
>  inst "t2F_(2)" "TBUF" , placed R24C9 TBUF_X16Y1 ,
>   cfg "TINV::T IINV::I _SUPERBEL::TRUE"
>   ;
>  inst "t3C_(1)" "TBUF" , placed R24C8 TBUF_X14Y0 ,
>   cfg "TINV::T IINV::I _SUPERBEL::TRUE"
>   ;
>  inst "t3G_(1)" "TBUF" , placed R24C10 TBUF_X18Y0 ,
>   cfg "TINV::T IINV::I _SUPERBEL::TRUE"
>   ;
>  inst "t4D_(0)" "TBUF" , placed R24C8 TBUF_X14Y1 ,
>   cfg "TINV::T IINV::I _SUPERBEL::TRUE"
>   ;
>  inst "t4H_(0)" "TBUF" , placed R24C10 TBUF_X18Y1 ,
>   cfg "TINV::T IINV::I _SUPERBEL::TRUE"
>
> In top.ucf, instead:
>
> INST bm16_1/bus1 LOC = TBUF_X6Y45;
> INST bm16_1/bus2 LOC = TBUF_X6Y43;
>
> This means that bm16_1/bus is located at TBUF with X=6 and Y=45.
> So what's the meaning, instead, of  " inst "t1A_(3)" "TBUF" , placed
> R24C7 TBUF_X12Y0"? In particular, how I've to refer R C X e Y values?
> As I've understood, the bus macro provides a description of the bus,
> and  .ucf constraint file place the bus in the correct position on FPGA
> grid  in order to match the modules. Is it correct?
> So, in the macro, how I describes the values?
>
> Thank you very very much.
> Salvatore
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