Re: [partial-reconfig] Inter-module Communication

["Tyrone Kwok" <tokwok@xxxxxxxxxxx>]

Thanks very much, Sean.

BTW, if the I/O signals are of INOUT type, the manual routing seems 
complicated ...
Have you done this before ?

Cheers,

tk


>From: Sean Durkin <durkinsn@iis.fraunhofer.de>
>Reply-To: partial-reconfig@itee.uq.edu.au
>To: partial-reconfig@itee.uq.edu.au
>CC: tokwok@hotmail.com
>Subject: Re: [partial-reconfig] Inter-module Communication
>Date: Wed, 24 Mar 2004 10:46:33 +0100
>
>Tyrone Kwok wrote:
>
>>Hi all,
>>
>>Suppose that in my design, there are three parts in the FPGA:
>>
>>  |A | B | C |
>>
>>and that B is a reconfigurable moudle while A and C are static.
>>
>>My question is how inter-moudle communication is done in the
>>following situations:
>>
>>1. C needs to use some I/O pins in A, and the I/O signals
>>can't be interrupted after the system starts.
>>
>>2. C needs to use some I/O pins in B, and the I/O signals
>>can't be interrupted after the system starts.
>>
>>For situation 1, I think the commuication can be done using
>>bus macros, right ?
>Exactly, but you need to create your own macros to span the area of module 
>B in FPGA Editor. In my experience this (i.e. the crossing of modules via 
>bus macros) is something the tools have a lot of problems with. It seems to 
>help if you make the macros wider, i.e. don't let them end directly at the 
>module borders, but several CLB columns inside the modules. I have no idea 
>why that is, or if that can be considered a real solution, but it has 
>helped in my case.
>
>>For situation 2, I have no idea on how to main the connection
>>while B is being reconfigured.
>You could create a bus macro, and wire it's in/outputs to the IOBs manually 
>in FPGA Editor. In theory that should be possible, but I haven't tried this 
>so far.
>
>With ISE5.2 you can place a regular bus macro at the border between C and 
>B, and connect the macro ports that reside in B with the IOBs in the 
>top-level design (ISE6.1 usually gives you an error "Due to existing 
>islands"). Most of the time (but not always), par will route those 
>top-level-nets in the same way (so they will stay intact during 
>reconfiguration), unless the routing ressources are used up otherwise.
>
>But I'm afraid there is no really "safe" way to do this...
>
>--
>Best regards,
>
>Sean Durkin
>Fraunhofer Institute for Integrated Circuits IIS
>Dep. Electronic Imaging - HIS (Bildsensorik - HIS)
>Am Wolfsmantel 33
>91058 Erlangen
>Germany
>
>Fon: +49 9131 776 503
>Fax: +49 9131 776 598
>
>Web: http://www.iis.fraunhofer.de
>mailto:durkinsn@iis.fraunhofer.de
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