Reply by Gary...@aol.com●January 8, 20092009-01-08
On Jan 4, 12:16=A0pm, Mad I.D. <madi...@MOOOOVEyahoo.com> wrote:
> I just connected a 32MB of x32 SDRAM (one IC) on LPC2478 chip and
> unfortunately have some doubts.
>
> SDRAM Spec:
> 4k Row (12bits) x 512 column (9bits) x 32 bits.
>
> I was having trouble to figure out where to connect bank address pins
> and found in some other document (not user manual) that
> A14:A11->BA1:BA0 should be OK. Why is this not documented in user
> manual? Did I miss something ? [A12 is not used at all, row addressing
> is A0-A11].
>
> The reason I'm writing this is because I don't understand Address
> Mapping table on page 84 of the user manual.
>
> I can't find appropriate Address Mapping (AM) bits setting for my
> SDRAM.
>
> There is no ->
> "4 bank, row length=3D12, column length=3D9 (2Mx32) 32MB"
>
> Can someone please clear this up for me a little bit? Thank you very
> much.
Which SDRAM chip is this?
Reply by Mad I.D.●January 4, 20092009-01-04
I just connected a 32MB of x32 SDRAM (one IC) on LPC2478 chip and
unfortunately have some doubts.
SDRAM Spec:
4k Row (12bits) x 512 column (9bits) x 32 bits.
I was having trouble to figure out where to connect bank address pins
and found in some other document (not user manual) that
A14:A11->BA1:BA0 should be OK. Why is this not documented in user
manual? Did I miss something ? [A12 is not used at all, row addressing
is A0-A11].
The reason I'm writing this is because I don't understand Address
Mapping table on page 84 of the user manual.
I can't find appropriate Address Mapping (AM) bits setting for my
SDRAM.
There is no ->
"4 bank, row length=12, column length=9 (2Mx32) 32MB"
Can someone please clear this up for me a little bit? Thank you very
much.