[sdiy] using 6264 Ram

[Jason Tribbeck]

Hi,

> (hm6264lp in my case)
> 
> I cant currently find any good synth schematics that use these so if
anyone
> knows of any, that would be great.
> 
> the datasheet doesnt give any application notes so I am a bit lost
right
> now.

What are you using to control it? Discreet logic, or microcontroller?

Normally, they're not too difficult to control - the timing diagrams
will basically tell you what you need to "wobble" at what times.

>From memory, the sequence should be something like:

Reading:

- Set -CS1 high, CS2 low, -OE high, -WE high
- Set the address lines
- Pull -CS1 low and CS2 high
- Pull -OE low
- Read data lines
- Pull -CS1 high, CS2 low and -OE high

Writing:

- Set -CS1 high, CS2 low, -OE high, -WE high
- Set the address lines
- Set the data lines
- Pull -CS1 low and CS2 high
- Pull -WE low
- Pull -CS1 high, CS2 low and -OE high

Note you can pull CS1 permanently low, OR CS2 permanently high and
you'll only have one line controlling the selection.
-- 
Jason Tribbeck