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List:       microblaze-uclinux
Subject:    Re: [microblaze-linux] DDR CLOCK SPEED ON SPARTAN-6
From:       Giulio Mazzoleni <giulio.mazzoleni () digital-instruments ! com>
Date:       2011-08-05 14:51:07
Message-ID: 1312555867.6850.38.camel () localhost ! localdomain
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Hi Graeme.
Glad to know I'm not the only one suffering from these kind of things.
RZQ on K7 would be ok for me, too. But on Y2 the 3rd block has a DQ14
(at least on spartan 6 lx45t).
I am going on vacation till 22 august, so I think I'll not be able to
answer till that date.
Good times to you all, too.
And thanks.
Giulio

On Fri, 2011-08-05 at 07:28 -0700, Graeme Smecher wrote:
> Hi Giulio,
> 
> On 05/08/11 03:40 AM, Giulio Mazzoleni wrote:
> > Furthemore if I give a slow clock to DDR ram (75/80 MHz) I can boot
> > Linux correctly, but If I issue the RAM-RAM compare task I can pass 1.5
> > MB over 5 MB data before triggering a bad read (that would explain some
> > crashes I am getting at runtime, by the way).
> >
> > If I increase the clock to 150/160 MHz I can trigger the compare error
> > after only 1 KB. And this strange behaviour is quite consistent.
> >
> > I am attaching the schematics related to the DDR interconnection.
> > Please note that for ZIO and RZQ I am using W4 and R7 respectively (so
> > that ZIO remains unconnected).
> 
> In my Spartan-6 design, we used RZQ=K7 / ZIO=Y2, as suggested by an 
> earlier version of the tools. We fought the MCB with issues similar to 
> yours for a long time, and eventually settled on a working static 
> configuration that doesn't use these calibration pins. Our design also 
> uses DDR1, and is clocked at 200 MHz (MPMC_Clk_Mem_2x/MPMC_Clk_Mem_2x_180).
> 
> Also, there may be MCB calibration issues related to ES 
> (engineering-sample) parts. It might be worth asking your FAE if you use 
> them.
> 
> best,
> Graeme
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> microblaze-linux@lists.itee.uq.edu.au
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