Re: [OT] sdram info needed
Well, here are modules, still no schematics though, sorry.
http://www.micron.com/products/datasheet.jsp?path=/Modules
gertie at visionsix.com wrote:
>
>On 27 Mar 2003, at 14:11, Evan Marshall wrote:
>
>
>>Don't know if this helps, but.....
>>http://www.micron.com/products/datasheet.jsp?path=/DRAM/EDO+FPM
>>
>>
>Not really, every chip is marked "not recommended for new designs",
>meaning it is slated for being discontinued. Plus, those are chips, not readily
>
>available simms or dimms. The tsop package is nearly impossible for the
>home hobbyist to solder into a design, the soj is even worse since they will
>wick solder under the package, and i'd hate to try doing gigabytes of them
>one megaBIT (at 50pins each) at a time. There's no typical application
>schematics either, if i could drop in a refresh controller chip straight out of
>
>such literature, that would save me design time too.
>
><rant>
>And doncha love how the dimm sellers will market the module as a 20ns or
>faster dimm, but the part company like Micron plainly shows the *total* read
>cycle time (excluding time out for refresh) is 80ns? I've seen "200mhz" ram
>that couldn't keep up with a generic fpga if put to the test. Reminds me of
>16mhz 8085's that couldn't keep up with a 1mhz 6502.
></rant>
>
>Kat
>
>
>>gertie at visionsix.com wrote:
>>
>>
>>>On 27 Mar 2003, at 10:12, rudy toews wrote:
>>>
>>>
>>>>gertie at visionsix.com wrote:
>>>>
>>>>
>>>>
>>>>
>>>>>Does anyone have a schematic on how to make a commonly available
>>>>>generic dimm sdram/edo look like a plain olde static ram? With 3gigs of
>>>>>data,
>>>>>at 60ns/access/byte, it will take 3 minutes to bruteforce search it, and
>>>>>obviously using software on top of an OS will take considerably longer. I
>>>>>am
>>>>>thinking of reviving a 20yr old idea, which wasn't useable back when dram
>>>>>came in 16Kx1 chips and was $1500/megabyte. But to make it work, i need to
>>>>>use the mass produced and much cheaper computer memory forms, which i am
>>>>>lacking info on. Online references or available book sources welcome.
>>>>>
>>>>>Unless someone has 10,000's of 3 to 10 gigs of the olde dip chips they
>>>>>want
>>>>>to get rid of?
>>>>>
>>>>>Thanks,
>>>>>Kat
>>>>>
>>>>>
>>>>>
>>>>>
>>>>hi Kat
>>>>now i am curious. i think i still have some old manuals for memory
>>>>boards. i started computing with an S100 system (cromemco)(pre-ibm pc)
>>>>and had added a 'ram drive' to it. is that your project?
>>>>i had bought the ram drive already assembled.
>>>>
>>>>
>>>>
>>>>
>>>I remember the S100 stuff, but i never had one myself. I did have a ZX80,
>>>VIc20
>>>and C64. The C64 still works fine. I have books on chips like the 6116, and
>>>others of that era. For massive memory those chips are still far too
>>>expensive,
>>>in parts cost and assembly time and power use. I expect i will be using the
>>>smallest simm or dimm modules i can reasonably get. I am more interested in
>>>width than depth of the memory. I don't have books on the simms or dimms, or
>>>application notes and gotchas.
>>>
>>>Kat
>>>
>>>
>
>
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