DDR speed of the XUPV2P Board from Digilent

  • Thread starter Benjamin Menküc
  • Start date
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Benjamin Menküc

Guest
Hi,

I am doing stuff with Displays. The data rate is about 3 gigabits/s for
the pixels. I am thinking about using the XUPV2P from digilent for this
application.

Since I would have to read and write at the same time, I would need a
data rate of about 6 gigabits/s.
Would it be possible with this board?
http://www.digilentinc.com/info/XUPV2P.cfm

regards,
Benjamin
 
Hi,

In the datasheet I can find, that the board can run DDR ram at 133 MHz.
Since the buswidth of the dimm-modules is 64 bit, my datarate is
2*133MHz*64Bit=17 gigabits/s. That would be enough.
Am I right?

regards,
Benjamin
 
You may find the following DDR and DDR2 boards interesting:

http://www.hitechglobal.com/xilinx/ml361.htm
http://www.hitechglobal.com/ted/virtex4ddr.htm

Regards,
 
Hi CPU,

I have looked at those boards already. I find them a little bit
expensive for me as student. However I think the XUPV2P board would
work. I am just wondering why the XUPV2P board can only do ddr1 at 133
MHz... Does anybody know what the limiting factor is?

regards,
Benjamin
 
"Benjamin Menküc" <benjamin@menkuec.de> wrote in message
news:d5o79u$2ke$01$1@news.t-online.com...
Hi,

I am doing stuff with Displays. The data rate is about 3 gigabits/s for
the pixels. I am thinking about using the XUPV2P from digilent for this
application.

Since I would have to read and write at the same time, I would need a data
rate of about 6 gigabits/s.
Would it be possible with this board?
http://www.digilentinc.com/info/XUPV2P.cfm

regards,
Benjamin
Click to expand...
Why don't you try emailing digilentinc, they usually reply quite promptly.

Alex
 
"Alex Gibson" <news@alxx.net> wrote in message
news:3eanggF2268gU1@individual.net...

Why don't you try emailing digilentinc, they usually reply quite promptly.

Their e-mail must be more reliable than their web site then.
Click to expand...
Maybe I'mj ust unlucky, but about half the time I try to go there
(including today) I can't get in.
 
Hi,

a reload usually fixes this problem for me.

PS: I will ask Digilent about the DDR speed, once I get a response to my
first email question :)

regards,
Benjamin
 
Hi,

I talked to Digilent on the phone. They didn't know exactly how fast the
ram can go.

Here is what I find in the users guide of the board:

These memory modules are designed for a maximum clock frequency of at
least 133 MHz
and have a CAS latency of 2.5 (18.8 ns). The PLB Double Data Rate
Synchronous DRAM
Controller supports CAS latencies of two or three clock cycles.
If the memory system is to operate at 100 MHz, then set the CAS latency
parameter in the
controller design to 2 (20 ns). If full speed (133MHz) memory operation
is required, then
set the CAS latency parameter in the controller design to 3 (22.6 ns).

What I don't understand is, whether the 133 MHz is the maximum clock or
not. Can it run 200 MHz as well?

regards,
Benjamin
 
For that you need to check the DRAM manufacturer... sometimes its not the
clock thats so important.. but the time delays.. so at 200MHz you might find
it 5-5-5 but 3-3-3 at 133MHz

Simon


"Benjamin Menküc" <benjamin@menkuec.de> wrote in message
news:d5qrsu$jid$01$1@news.t-online.com...
Hi,

I talked to Digilent on the phone. They didn't know exactly how fast the
ram can go.

Here is what I find in the users guide of the board:

These memory modules are designed for a maximum clock frequency of at
least 133 MHz
and have a CAS latency of 2.5 (18.8 ns). The PLB Double Data Rate
Synchronous DRAM
Controller supports CAS latencies of two or three clock cycles.
If the memory system is to operate at 100 MHz, then set the CAS latency
parameter in the
controller design to 2 (20 ns). If full speed (133MHz) memory operation
is required, then
set the CAS latency parameter in the controller design to 3 (22.6 ns).

What I don't understand is, whether the 133 MHz is the maximum clock or
not. Can it run 200 MHz as well?

regards,
Benjamin
Click to expand...
 
Simon Peacock wrote:
For that you need to check the DRAM manufacturer... sometimes its not the
clock thats so important.. but the time delays.. so at 200MHz you might find
it 5-5-5 but 3-3-3 at 133MHz
Click to expand...
While we're on the subject - does anybody know of an EDK reference
design for the XUP2VP, particularly one exercising the DDR slot? I
looked on the Digilent website but didn't see anything, nor on the
xilinx.com page dedicated to the board.

Thanks,

John
 
Hi,

I am looking too for reference designs. The guy from Digilent told me on
the phone, that they are waiting to receive the promised reference
designs from Xilinx, to put them on their homepage.

Maybe someone from Xilinx knows when they will be available.

regards,
Benjamin
 
Hi Benjamin,

Benjamin Menküc wrote:

I am looking too for reference designs. The guy from Digilent told me on
the phone, that they are waiting to receive the promised reference
designs from Xilinx, to put them on their homepage.

Maybe someone from Xilinx knows when they will be available.
Click to expand...
I now have a preliminary version of a MicroBlaze-uClinux capable
reference design, including EDK 7.1 project, bitstreams and kernel
images, hosted on the MicroBlaze uClinux home page

http://www.itee.uq.edu.au/~jwilliams/mblaze-uclinux

I call it preliminary because there is still a bit of tweaking to be
done, however it should provide a good starting point for you to work
with this excellent board.

Note the design was provided to on an "as-is" basis, so please do not
contact Xilinx for support. Actually I see that the Digilent site now
has a lot more resources, including this same reference design:

http://www.digilentinc.com/info/XUPV2P.cfm

Regards,

John
 
Hi,

thanks. The reference designs look nice.

regards,
Benjamin
 
sir
i am working on image processing project with deals with implementation of it on xc2vp30 device but to to run my code on board i need to set pins AC11 and AD11 can you please tell can i find the pin on board . i have searched in all data sheets and cannot find the pin location.



thank you in advance
 
On Thursday, May 8, 2014 8:10:49 PM UTC+5:30, Gabor wrote:
impanaeng@gmail.com wrote:

sir

i am working on image processing project with deals with implementation of it on xc2vp30

device but to to run my code on board i need to set pins AC11 and AD11 can you please tell

can i find the pin on board . i have searched in all data sheets and

cannot find the pin location.



thank you in advance



The schematics are at:



http://www.xilinx.com/univ/XUPV2P/Documentation/EXTERNAL_REV_C_SCHEMATICS.pdf



The two pins you mentioned connect to DIP switch SW7. I'm not

sure what that has to do with the DDR speed. Did you expect these

pins to supply a clock?



--

Gabor
Click to expand...

thank you for your reply

the pins ac11 and ad11 which i have assigned are for reset and to start the block which need to be varied after each clock pulse.so i thought it should be given as data inputs to the board.
 
impanaeng@gmail.com wrote:
sir
i am working on image processing project with deals with implementation of it on xc2vp30
device but to to run my code on board i need to set pins AC11 and AD11 can you please tell
can i find the pin on board . i have searched in all data sheets and
cannot find the pin location.

thank you in advance
Click to expand...

The schematics are at:

http://www.xilinx.com/univ/XUPV2P/Documentation/EXTERNAL_REV_C_SCHEMATICS.pdf

The two pins you mentioned connect to DIP switch SW7. I'm not
sure what that has to do with the DDR speed. Did you expect these
pins to supply a clock?

--
Gabor
 
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