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Re: [microblaze-uclinux] Strange SDRAM behaviour

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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> >
> >
> >
> >
> 
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