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List:       john-dev
Subject:    Re: [john-dev] Re: ztex 1.15y boards, pre-development
From:       Aleksey Cherepanov <lyosha () openwall ! com>
Date:       2015-07-29 3:10:59
Message-ID: 20150729031059.GA28277 () openwall ! com
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On Mon, Jul 27, 2015 at 06:56:42PM +0200, Katja Malvoni wrote:
> On 27 July 2015 at 18:15, Aleksey Cherepanov <lyosha@openwall.com> wrote:
> 
> > On Mon, Jul 27, 2015 at 06:02:03PM +0200, Katja Malvoni wrote:
> > > On 27 July 2015 at 17:49, Aleksey Cherepanov <lyosha@openwall.com>
> > wrote:
> > > > I tried to write several times and to write more in 1 pack (but not
> > > > both). I get results only in fifth reading. So I removed printf and
> > > > added cycle so:
> > > >
> > > > 5000 times:
> > > >   modify sent[]
> > > >   write 64 bytes
> > > >   read till length == 34 or up to 6 times
> > > >   fail if read 6 times
> > > >   check results
> > > >
> > > > It does not fail. 5k iteration take 6.1 seconds, so transfer speed is
> > > > 52kb/s. Code attached.
> > > >
> > >
> > > Cool! But I have one question: did you modify FPGA code? Because internal
> > > FPGA buffer has size of 256 bits which is 32 bytes. Actually, now when I
> > > look at host code, it seems you're writing 32 bytes, right?
> >
> > You're right: Above, I wrote "64 bytes" wrongly. It should be "32
> > bytes". I did not modify fpga code.
> >
> > So the speed is 26kb/s.
> >
> 
> I can reproduce the same behavior.

I tried to modify your intraffic.v: I added

		SLRD_R <= 1'b1;

into true branch of

	if (RESET == 1) begin

This way I get correct results in the first read in the first run. On
the second run and further, it behaves like above: correct results on
5th read.

Thanks!

-- 
Regards,
Aleksey Cherepanov
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