On 05/11/2010 18:29, Patrick McNamara wrote:
I think I may have asked this before, but I'll ask it again, just in
case. One your board, to the lower left of the S3 are two oscillators.
One will be 133MHz, and the other is what?
Hi.
You're spot on. The top one (Y2) is 133M33000, the bottom one (Y3) is
156M25000.
I'll have a look at the verilog and see if I can work out how to change
the PLL so that by clocks are running at the same frequency as yours. I
suspect that if I can find a matching xtal I can get a friend here to
swap it (my soldering skills are a bit ropey, but I work with some masters).
One of the things that I was going to add locally was a counter
connected to each clock, just to check this sort of thing.
Thanks for the tip.
MM
I suspect your memory errors are, as you say, actually bridge errors. I
also suspect you have a faster clock for the input to the bridge clock
generator. This would mean that the XP10 image I build, which was built
for a 125MHz clock, would actually run the bridge at a faster speed. If
this is the case, there are likely some signals that are violating setup
timing do to the faster clock.
Patrick M
------------------------------------------------------------------------
*From:* Mark Marshall <[email protected]>
*To:* [email protected]
*Sent:* Fri, November 5, 2010 1:14:15 PM
*Subject:* [Open-graphics] Re: Some small changes
On 03/11/2010 02:44, Patrick McNamara wrote:
> On 11/02/2010 07:13 AM, Mark Marshall wrote:
>> Hi.
>>
>> First some good news. I've managed to produce images for both FPGA's.
>> For the XP10 I've used "ispLever Starter FPGA 8.1.00.34.21.10". For
>> the S3 I used version 12.[123].00 of the xilinx tools (I forget which
>> I chose, we seem to have every version from 9.1 to 12.3 installed at
>> work?).
>
> Very cool. What timing errors did you get on the XP10? Assuming that you
> used the constraints from the repo, you likely got errors on the
> bridge_ad signals.
I've not really used my S3 image - I've stuck with yours and tried to
not break compatability. I've made a number of XP10 ima ges and they all
seem to have broadly worked. I have to admit that I find it very hard to
find the significant errors amongst the noise, and I also struggle to
understand what they mean. I can send a log if you are interested, but
they are quite boring!
I do get some errors somewhere, but I don't know if this is because I'm
running on a pre-production part? At the moment I see quite obvious
errors when the HQ code reads the text buffer while doing text-convert.
I get spurious '$' and '(' characters all over the screen (actually
there are a set of places where such a character might appear, and then
I randomly get or don't get it at those locations - I assume the
locations are where the address is some multiple of something?)
The intersting thing is that the font data is read back from the S3
perfectly (as far as I can tell) as the characters themselves are always
perfect. Maybe it is only the last word of a read that is corrupted? It
could also be a bug in the HQ code.
memtest fails with a minimum of 7000 erros or so, and I can see a
definate pattern to them. I think all of the errors are in the S3 ->
XP10 stage, and are not really memory errors. I'm not sure how to test that.
MM
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