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Re: [microblaze-uclinux] Strange SDRAM behaviour
Finally, I found that it's really the hardware problem. Thank Aurash!
Tyrone
On Tue, 26 Oct 2004 22:28:33 +0800, Tyrone Kwok <tokwok@gmail.com> wrote:
> Hi Aurash,
>
> Thanks for your hints. However, I've checked that the hardware part seems have
> no problem. Is there other possibility for the fault?
>
> Regards,
> Tyrone
>
>
>
>
> On Mon, 25 Oct 2004 12:26:15 +0100, aurash <aurelian.lazarut@ntlworld.ie> wrote:
> > Tyrone,
> >
> > you have a problem with LSB line from the address bus, A29 on the MB
> > side and A0 on the memory side. Very likely the A0 trace on the PCB is
> > shorted or open, or a cold joint (solder) , or it can be from the UCF
> > file (wrong pin loc for A0)
> >
> > Aurash
> >
> > PS. when I'm referring to A0, I mean the address pin on memory.
> >
> >
> >
> > Tyrone Kwok wrote:
> >
> > >Hi all,
> > >
> > >In my design, there is a 4M x 16 SDRAM. When I test it under XMD, a strange
> > >behaviour comes: whenever I write to the memory address 0xYYYY_YYY0, the
> > >the value is also written to the address 0xYYYY_YYY4, and vice versa (please
> > >have a look at the XMD messages below). Could anyone kindly point out
> > >the possible causes? Thanks in advance!
> > >
> > >Cheers,
> > >Tyrone
> > >
> > >========================================================
> > >
> > >XMD% mrd 0x81800000 8
> > >81800000: 00000000
> > >81800004: 00000000
> > >81800008: 00000000
> > >8180000C: 00000000
> > >81800010: 00000000
> > >81800014: 00000000
> > >81800018: 00000000
> > >8180001C: 00000000
> > >XMD% mwr 0x81800000 0x12345670
> > >XMD% mrd 0x81800000 8
> > >81800000: 12345670
> > >81800004: 12345670
> > >81800008: 00000000
> > >8180000C: 00000000
> > >81800010: 00000000
> > >81800014: 00000000
> > >81800018: 00000000
> > >8180001C: 00000000
> > >XMD% mwr 0x81800004 0x12345671
> > >XMD% mrd 0x81800000 8
> > >81800000: 12345671
> > >81800004: 12345671
> > >81800008: 00000000
> > >8180000C: 00000000
> > >81800010: 00000000
> > >81800014: 00000000
> > >81800018: 00000000
> > >8180001C: 00000000
> > >XMD% mwr 0x81800008 0x12345672
> > >XMD% mrd 0x81800000 8
> > >81800000: 12345671
> > >81800004: 12345671
> > >81800008: 12345672
> > >8180000C: 00000000
> > >81800010: 00000000
> > >81800014: 00000000
> > >81800018: 00000000
> > >8180001C: 00000000
> > >XMD% mwr 0x8180000c 0x12345673
> > >XMD% mrd 0x81800000 8
> > >81800000: 12345671
> > >81800004: 12345671
> > >81800008: 12345672
> > >8180000C: 12345673
> > >81800010: 00000000
> > >81800014: 00000000
> > >81800018: 00000000
> > >8180001C: 00000000
> > >XMD% mwr 0x81800010 0x12345674
> > >XMD% mrd 0x81800000 8
> > >81800000: 12345671
> > >81800004: 12345671
> > >81800008: 12345672
> > >8180000C: 12345673
> > >81800010: 12345674
> > >81800014: 12345674
> > >81800018: 00000000
> > >8180001C: 00000000
> > >XMD%
> > >
> > >========================================================
> > >___________________________
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> > >microblaze-uclinux@itee.uq.edu.au
> > >Project Home Page : http://www.itee.uq.edu.au/~jwilliams/mblaze-uclinux
> > >Mailing List Archive : http://www.itee.uq.edu.au/~listarch/microblaze-uclinux/
> > >
> > >
> > >
> > >
> >
> > ___________________________
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> > microblaze-uclinux@itee.uq.edu.au
> > Project Home Page : http://www.itee.uq.edu.au/~jwilliams/mblaze-uclinux
> > Mailing List Archive : http://www.itee.uq.edu.au/~listarch/microblaze-uclinux/
> >
> >
>
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