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???
04/30/09 23:12
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 		 #164973 - A CPLD at each end would do nicely
Responding to: ???'s previous message
Do you plan to do this with a microcontroller? If so, the timing will be critical. For a simple LCD-parallel-to-serial and serial-to-parallel-LCD link in programmable logic, it's not anywhere near critical.

If you take a look at the XILINX and the ALTERA offering of small CPLD's, you'll see they offer a number of differential communication options and, I'd guess the whole thing will fit in a TQFP-44 or -48, which is about 1 cm square. With a crystal oscillator built from on-chip inverters, you won't need a microcontroller to sample and disassemble the parallel data at the LCD module, nor will you need one to reassemble and parallel-interface with the LCD. The only issue would be the interface levels. Most popular CPLD's operate with 3V3 I/O voltage levels.

RE


List of 24 messages in thread
TopicAuthorDate
How to read and redisplay from LCD databus?            01/01/70 00:00      
   Spy on the Data & Control lines            01/01/70 00:00      
      Can be hard to be fast enough            01/01/70 00:00      
   Shouldn't be a problem            01/01/70 00:00      
      some HW might be needed            01/01/70 00:00      
         Monitor the LCD databus then send via 485            01/01/70 00:00      
         I don't see a place for the 805x            01/01/70 00:00      
      Re: Shouldn't be a problem            01/01/70 00:00      
         some basic questions            01/01/70 00:00      
            Re:some basic questions            01/01/70 00:00      
               20 Meters            01/01/70 00:00      
                  Re: 20 Meters            01/01/70 00:00      
      Signal timing and command timing separate issues            01/01/70 00:00      
         Check the datasheet ...            01/01/70 00:00      
            Re: Check the datasheet ... and test on LCD of board B first            01/01/70 00:00      
               A CPLD at each end would do nicely            01/01/70 00:00      
                  Re: A CPLD at each end would do nicely            01/01/70 00:00      
                     it depends on requirements            01/01/70 00:00      
                        Watch out for assumptions about busy            01/01/70 00:00      
                           If that gets to be an issue ...            01/01/70 00:00      
                              slave timing            01/01/70 00:00      
                                 I doubt that will work.            01/01/70 00:00      
   I had done something like this in past            01/01/70 00:00      
      Re: I had done something like this in past            01/01/70 00:00      

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