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???
03/06/06 17:26
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 		 #111409 - serial FLASH parallel SRAM?
Responding to: ???'s previous message
Richard Erlacher said:
These flash+SRAM devices so far tend to have less SRAM than FLASH.

The Simtek/ZMD parts DO have the same amount of FLASH as SRAM. You even won't notice there is some FLASH, you simply use it as a SRAM. Upon powerup it automatically transfers the content of FLASH to SRAM (it is massively parallel, so you don't need to wait for it at all) and upon powerdown it writes the current content of SRAM to FLASH. Works like a charm, a superb replacement for battery-backed SRAMs.

But they ARE small so they won't fit your requirement.

Richard Erlacher said:
What I need is the same amount of RAM. If we had time to build a new set of boards and get 'em approved, it would be different, but I have to use the existing board, which already can support the configuration I'm after.

The shadowing concept occurred to me at the outset, but, due to space limitations, there's really no place where I can "scab-on" an extra batch of RAM atop the FLASH because of board clearance issues.

Couldn't you replace the FLASH by SRAMs (they should have quite similar pinout) and then plug somewhere in a serial FLASH to be copied into the FLASH at the bootup?

Jan Waclawek


List of 28 messages in thread
TopicAuthorDate
Has anybody seen FAST FLASH?            01/01/70 00:00      
   nope but then again......            01/01/70 00:00      
      It's not an 805x            01/01/70 00:00      
   external flash as code memory            01/01/70 00:00      
      Fast Flash            01/01/70 00:00      
      That's what I wanted to avoid.            01/01/70 00:00      
         "scabbing-on"            01/01/70 00:00      
            Yes, but...            01/01/70 00:00      
               www.sst.com            01/01/70 00:00      
                  Too bad ...            01/01/70 00:00      
      It doesn't take much effort to use 2 MB            01/01/70 00:00      
         apples and oranges            01/01/70 00:00      
   silly me            01/01/70 00:00      
      Nope, not this time            01/01/70 00:00      
   what about            01/01/70 00:00      
      program/erase cycle isn't important            01/01/70 00:00      
         nvSRAM            01/01/70 00:00      
            too little SRAM            01/01/70 00:00      
               serial FLASH parallel SRAM?            01/01/70 00:00      
                  That won't work            01/01/70 00:00      
                     are you desperate enough?            01/01/70 00:00      
                        I didn't expect an easy fix.            01/01/70 00:00      
                           I used digikey as a "search engine" and            01/01/70 00:00      
                              40MHz bus speed            01/01/70 00:00      
                                 big=slow?            01/01/70 00:00      
                                    That's the case, sadly ...            01/01/70 00:00      
                                       could you            01/01/70 00:00      
                                          Nope ... it's etched in concrete ...            01/01/70 00:00      

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