Partial Reconfiguration

[ram]

Hi all,
I am interested in doing partial reconfiguration using Xilinx Virtex
2 pro, i am having a HW AFX xilinx prototype baord.
I tried the small bit manipulation method defined in Xilinx
application note
xapp290, with the simple example , Example 1 simple system desing from
xilinx EDK examples web page.
Ok , my desing is this,
I am using PPC405, and uartlite and gpio with uart continiously
writing some data in Hyper terminal and gpio is connected to four leds
and writing '1' to it
I tried to change the routing for the LEDs , I do have to mention
here, my board has 8 user LEDS, i changed the routing from upper half
to lower half and generated the partial bit stream.
Everything goes well so far, but when i download this partial
bitstream into FPGA, my uart stops putting out data, but LEDS gets
rerouted and now the lower half LEDs o/p '1'.
I would like to know wether what i am trying to do was right, also if
anybody worked on small bit manipulations, I would appreciate their
comments and advice.
Thank you for the posting me a reply.
bye
Ram

 

[Steve Lass]

ram wrote:

Hi all,
I am interested in doing partial reconfiguration using Xilinx Virtex
2 pro, i am having a HW AFX xilinx prototype baord.
I tried the small bit manipulation method defined in Xilinx
application note
xapp290, with the simple example , Example 1 simple system desing from
xilinx EDK examples web page.
Ok , my desing is this,
I am using PPC405, and uartlite and gpio with uart continiously
writing some data in Hyper terminal and gpio is connected to four leds
and writing '1' to it
I tried to change the routing for the LEDs , I do have to mention
here, my board has 8 user LEDS, i changed the routing from upper half
to lower half and generated the partial bit stream.

The configuration frames are columns, so if the routing you are changing

is in the same column
as the PPC, UART, or any of their routing, they will probably stop.

Steve

Everything goes well so far, but when i download this partial
bitstream into FPGA, my uart stops putting out data, but LEDS gets
rerouted and now the lower half LEDs o/p '1'.
I would like to know wether what i am trying to do was right, also if
anybody worked on small bit manipulations, I would appreciate their
comments and advice.
Thank you for the posting me a reply.
bye
Ram

 

[rickman]

Steve Lass wrote:

ram wrote:

Hi all,
I am interested in doing partial reconfiguration using Xilinx Virtex
2 pro, i am having a HW AFX xilinx prototype baord.
I tried the small bit manipulation method defined in Xilinx
application note
xapp290, with the simple example , Example 1 simple system desing from
xilinx EDK examples web page.
Ok , my desing is this,
I am using PPC405, and uartlite and gpio with uart continiously
writing some data in Hyper terminal and gpio is connected to four leds
and writing '1' to it
I tried to change the routing for the LEDs , I do have to mention
here, my board has 8 user LEDS, i changed the routing from upper half
to lower half and generated the partial bit stream.

The configuration frames are columns, so if the routing you are changing
is in the same column
as the PPC, UART, or any of their routing, they will probably stop.

I am looking at using this feature, although not while the chip is
running. One problem I foresee is that with a column alignment, a
module might be very hard to route if it is restricted to just a small
number of columns.

In my application there are 5 modules with one being constant and four
being changed according to the hardware that is connected. Some of the
planned modules are much larger than others, so I don't see them mapping
to a fixed footprint. Some may be as narrow as two or even one column
in an XC3S400.

So I have been thinking about partitioning the designs differently.
Instead of mapping modules to columns, I would divide the columns in
half and map the designs to half columns. This won't be an issue as
long as none of the logic (or interconnect) in the column is being used
by running circuitry. But it will require that the bit files be
assembled from partial bit files. Each column will need to be made of
two halves glued together. As long as there is no routing between them,
this should be a simple matter of concatenating two separate streams for
each column.

Anyone know if this might be practical?

--

Rick "rickman" Collins

rick.collins@XYarius.com
Ignore the reply address. To email me use the above address with the XY
removed.

Arius - A Signal Processing Solutions Company
Specializing in DSP and FPGA design URL http://www.arius.com
4 King Ave 301-682-7772 Voice
Frederick, MD 21701-3110 301-682-7666 FAX

 

[ram]

Steve,
I never gave a thought abt that, I think thats the possibility, Thank you
RAm
Steve Lass <lass@xilinx.com> wrote in message news:<3F8D7159.4070401@xilinx.com>...

ram wrote:

Hi all,
I am interested in doing partial reconfiguration using Xilinx Virtex
2 pro, i am having a HW AFX xilinx prototype baord.
I tried the small bit manipulation method defined in Xilinx
application note
xapp290, with the simple example , Example 1 simple system desing from
xilinx EDK examples web page.
Ok , my desing is this,
I am using PPC405, and uartlite and gpio with uart continiously
writing some data in Hyper terminal and gpio is connected to four leds
and writing '1' to it
I tried to change the routing for the LEDs , I do have to mention
here, my board has 8 user LEDS, i changed the routing from upper half
to lower half and generated the partial bit stream.

The configuration frames are columns, so if the routing you are changing
is in the same column
as the PPC, UART, or any of their routing, they will probably stop.

Steve

Everything goes well so far, but when i download this partial
bitstream into FPGA, my uart stops putting out data, but LEDS gets
rerouted and now the lower half LEDs o/p '1'.
I would like to know wether what i am trying to do was right, also if
anybody worked on small bit manipulations, I would appreciate their
comments and advice.
Thank you for the posting me a reply.
bye
Ram

 

[Steve Lass]

rickman wrote:

Steve Lass wrote:


ram wrote:



Hi all,
I am interested in doing partial reconfiguration using Xilinx Virtex
2 pro, i am having a HW AFX xilinx prototype baord.
I tried the small bit manipulation method defined in Xilinx
application note
xapp290, with the simple example , Example 1 simple system desing from
xilinx EDK examples web page.
Ok , my desing is this,
I am using PPC405, and uartlite and gpio with uart continiously
writing some data in Hyper terminal and gpio is connected to four leds
and writing '1' to it
I tried to change the routing for the LEDs , I do have to mention
here, my board has 8 user LEDS, i changed the routing from upper half
to lower half and generated the partial bit stream.



The configuration frames are columns, so if the routing you are changing
is in the same column
as the PPC, UART, or any of their routing, they will probably stop.



I am looking at using this feature, although not while the chip is
running. One problem I foresee is that with a column alignment, a
module might be very hard to route if it is restricted to just a small
number of columns.

In my application there are 5 modules with one being constant and four
being changed according to the hardware that is connected. Some of the
planned modules are much larger than others, so I don't see them mapping
to a fixed footprint. Some may be as narrow as two or even one column
in an XC3S400.

So I have been thinking about partitioning the designs differently.
Instead of mapping modules to columns, I would divide the columns in
half and map the designs to half columns. This won't be an issue as
long as none of the logic (or interconnect) in the column is being used
by running circuitry. But it will require that the bit files be
assembled from partial bit files. Each column will need to be made of
two halves glued together. As long as there is no routing between them,
this should be a simple matter of concatenating two separate streams for
each column.

Anyone know if this might be practical?

Anything is possible, but I wouldn't call it practical. There are no

tools to help out with this type of
methodology.

I'm not sure how many different combinations you have, but if it's a
reaasonable amount, I would
suggest creating bistreams for each combination. It seems like you have
to do that anyway with
your proposal.

Steve