SDRAM A0 is too slow. What might be the problem?

キャンセル
次の結果を表示 
表示  限定  | 次の代わりに検索 
もしかして: 

SDRAM A0 is too slow. What might be the problem?

1,181件の閲覧回数
moller
Contributor II

I am trying to configure my AS4C2M32SA-6TIN 64MB SDRAM on my LPC4337 (costum board).

I have verified that the EMC clock is half M4 core clock (204/2=102MHz) but when measuring A0
this is only running at 1MHz (expected to run at half core clock when read/write to the entire SDRAM).

What could be the reason for this? I got an MPC4357-EVB with 32MB 16-bit SDRAM and got the example working in uVision.

When trying to use this example on my 64MB 32-bit SDRAM in emIDE (with corrected parameters that fits this SDRAM) nothing works.

my config setup can be seen here http://pastebin.com/WAu4hXke

Hope someone is able to help.

ラベル(1)
0 件の賞賛
返信
1 返信

1,045件の閲覧回数
moller
Contributor II

In addition to this Bank select are not doing anything and CAS+RAS are at 3.3V at all times.

0 件の賞賛
返信