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???
09/26/12 04:09
Read: 1669 times


 
#188458 - SRAM issues
We have a old product that using a 68k series CPU and an 8051 type controller, the two chips communicate via shared SRAM and with a hardware bus attribution circuit. The supplier changed the SRAM to a lower power and faster ( was 70nS, the new one is 45nS) chip, and we started to have problem with the product. We found that replacing the chip with the old stock and the issue goes away. We checked the signals and seems all clean. Any suggestion what to look for? Any ideas are welcome.

Thanks

List of 18 messages in thread
TopicAuthorDate
SRAM issues      Harry Leung      09/26/12 04:09      
   Setup and hold times?      Per Westermark      09/26/12 04:21      
      RAM issues      Harry Leung      09/26/12 06:13      
         Or narrow pulses ?      Jim Granville      09/26/12 19:46      
      Address setup time      Harry Leung      10/02/12 20:48      
   did you change the arbitration?      Erik Malund      09/26/12 07:18      
      Ram issues      Harry Leung      09/26/12 07:36      
   P0, P2 for memory only, or ...      Erik Malund      09/26/12 09:04      
      p0 and p2      Harry Leung      09/27/12 03:29      
         If you latch both P0 and P2, there will be stabile A15-A0      Richard Erlacher      09/27/12 11:24      
   Arbitration circuit      Oliver Sedlacek      09/26/12 10:08      
   It's a bit tricky synchronizing an 805x with 68k series      Richard Erlacher      09/26/12 15:51      
   you are using a latch, and not a flipflop, right?      Richard Erlacher      09/26/12 22:54      
      FF or latch      Harry Leung      09/27/12 03:30      
         It's a mistake I've seen a time or two ...       Richard Erlacher      09/27/12 11:19      
            time wasting      Stefan KAnev      09/27/12 13:24      
               no circuit diagram      Harry Leung      09/27/12 20:38      
                  You don't have to do that      Richard Erlacher      10/05/12 13:45      

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