Re: [Xc3sprog-users] Programming XCFxxP flash PROMs

[Uwe B. <bo...@el...>]

>>>>> "Joris" == Joris van Rantwijk <jo...@sr...> writes:

    Joris> On Friday, July 09, 2010 11:15:13 Uwe Bonnes wrote:
    >> What is the program time now?

    Joris> About 480 seconds to program 24 Mbit.

Versus 140 in Impact. Bad...

    Joris> In the Linux kernel that I used, the option for high resolution
    Joris> timing was turned off. Today I figured out that high resolution
    Joris> timing greatly improves the accuracy of usleep. I will enable
    Joris> this setting and test again next week.

At some point in time I will switch to libusb-1.0 and use asynchronous
read. This could bring downprogramming time to.

    >> Btw: Any chance to look at the TDO driving gate on the S3 kit?

    Joris> I did not precisely understand your remarks (I'm not an
    Joris> electronics engineer). But let's try. On the S3 starter kit
    Joris> schematics, the type of IC2A is not specified. On the actual
    Joris> board, I can see an IC2 which is a tiny surface mounted thingy,
    Joris> marked something like "WOC".

Any manufacturer sign visible?
The smd marking sites don't bring anything sensible with WOC. But I think it
is a "strong" device.

    Joris> The Pender GR-XC3S1500 also fails with the parallel cable. Its
    Joris> schematic shows that TDO is driven directly from the FPGA's TDO
    Joris> pin without any components in between.

But the FPGA TDO output should also be "strong", so it will win against the
"weak" HC125 on the DLC5. On my clone is a "strong" LVC125, so my results
are different.

I will drop this unreliable test soon.

    Joris> Just to be sure, let me say again that the issue is only with the
    Joris> check for "missing power" at initialization time (which then
    Joris> aborts the program). If that check is skipped, programming with
    Joris> the parallel cable works absolutely fine for me.

Another reason to drop the test.

Cheers
-- 
Uwe Bonnes                bo...@el...

Institut fuer Kernphysik  Schlossgartenstrasse 9  64289 Darmstadt
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