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[microblaze-uclinux] Strange SDRAM behaviour
- To: mailinglist_microblaze-uclinux <microblaze-uclinux@xxxxxxxxxxxxxx>
- Subject: [microblaze-uclinux] Strange SDRAM behaviour
- From: Tyrone Kwok <tokwok@xxxxxxxxx>
- Date: Mon, 25 Oct 2004 18:22:04 +0800
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- Sender: owner-microblaze-uclinux@xxxxxxxxxxxxxx
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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