[sdiy] using 6264 Ram

[Dan Snazelle]

ok i am using logic

but i am bit confused here...I was under the impression that the I/O pins were the outputs and the A0-A12 pins were the inputs.

further reading has made me think this is wrong.

I understand using the truth table how to turn it from READ to WRITE but what I dont get is how to connect it so that I can input
an 8 bit signal (from the 8 outs of an ADC), flip it into WRITE mode, and have those be stored, and then how to connect the outputs so that
I can connect the 8 bits into a DAC.

i have never used RAM before  so sorry if I sound like an idiot.

thanks



----------------------------------------
> Subject: RE: [sdiy] using 6264 Ram
> Date: Tue, 16 Jun 2009 15:36:50 +0100
> From: Jason.Tribbeck at ascom.com
> To: subjectivity at hotmail.com; synth-diy at dropmix.xs4all.nl
>
> 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