DRAM to SD-RAM Adapter

[Reactive]

Yeah, I guess a little Breadboard area in the unused space is a good idea. Can't hurt at least and won't cost any extra.

On a separate topic - I was going through the different modes I'd like to have this Adapter support and started compiling a list.

I/Os required for JUST DRAM Emulation - List of possible modes to support.

256k x 1bit DRAM:
A0 to A9, /WE, /RAS, /CAS, D, Q = 15 per IC, 29 per bank.
Notes: All address lines are tied together for all banks.
/RAS and /CAS are tied together per bank.
8 bits (Din/Qout) per bank - Each bit from each bank is tied together. i.e.: D0's are all tied together, etc.
/WE are all tied together for all banks.


256k x 4bit DRAM:


256k 30 Pin SIMM (No Parity): Need datasheet.


256k 30 Pin SIMM (Parity): Need datasheet.


1Meg x 1bit DRAM:
A0 to A9, /WE, /RAS, /CAS, D, Q = 15 per IC, 29 per bank.
Notes: All address lines are tied together for all banks.
/RAS and /CAS are tied together per bank.
8 bits (Din/Qout) per bank - Each bit from each bank is tied together. i.e.: D0's are all tied together, etc.
/WE are all tied together for all banks.


1Meg x 4bit DRAM:
A0 to A9, /WE, /RAS, /CAS, /OE, DQ0-3 = 17 per IC, 21 per bank.
Notes: All address lines are tied together for all banks.
/RAS and /CAS are tied together per bank.
8 bits (DQ's) per bank - Each bit from each bank is tied together. i.e.: DQ0's are all tied together, etc.
/WE are all tied together for all banks.
/OE are all tied together for all banks and grounded.


4Meg x 1bit DRAM:


4Meg x 4bit DRAM:


1Meg 30 Pin SIMM (No Parity):
A0 to A11, /WE, /RAS, /CAS, DQ0-7 = 23 per SIMM.
Notes: All address lines are tied together for all SIMMs.
8 bits (DQ's) per SIMM - Each bit from each SIMM is tied together. i.e.: DQ0's are all tied together, etc.
/WE are all tied together for all banks.


1Meg 30 Pin SIMM (Parity):
A0 to A11, /WE, /RAS, /CAS, IP, OP, /CAS, DQ0-7 = 26 per SIMM.


4Meg 30 Pin SIMM (No Parity): Need datasheet.


4Meg 30 Pin SIMM (Parity): Need datasheet.


16Meg 30 Pin SIMM (No Parity): Need datasheet.


16Meg 30 Pin SIMM (No Parity): Need datasheet.



Anyone (Grant?) have any other modes they would like to see supported? I just start 'basic' and add support as I can find people to test the other modes. I know some are PC only, for instance.

I'm also looking for those datasheets listed above. Anyone know where I can find them?

Comments/suggestions?