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???
07/07/07 20:37
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 		 #141576 - I am talking about the textbook example...
Responding to: ???'s previous message
...when the chipselect of memory is activated from the address decoder on a combination of N highest bits of the address bus of microcontroller (processor); and the address bus of memory is augmented by these bits plus all the bits beyond the native address range of microcontroller (processor) from a single latch.

In your case, A0-A13 from the '51+573 would go directly to memory, A14 and A15 would go to address decoder, which would assert /CS of memory active upon A15:A14=10(bin). Then, A14-A17 of memory is connected to the address latch directly.

I just don't see the purpose of the adder, that's all.

JW


List of 23 messages in thread
TopicAuthorDate
What sorts of memory \"expansion\" have you tried?            01/01/70 00:00      
   why the adder?            01/01/70 00:00      
      it's a preliminary notion            01/01/70 00:00      
         I am talking about the textbook example...            01/01/70 00:00      
            there is a simple reason ...            01/01/70 00:00      
               whatizit?            01/01/70 00:00      
                  I\'m trying something odd ... and retro ...            01/01/70 00:00      
                     reading            01/01/70 00:00      
                        it's part of a larger process            01/01/70 00:00      
                           why that fast?            01/01/70 00:00      
                              It\'s because I know \"nothing\" about the controller            01/01/70 00:00      
                                 I still have questions.... :-)            01/01/70 00:00      
                                    We're not quite on the same page, Jan            01/01/70 00:00      
                                       formatting            01/01/70 00:00      
                                          must be a bug in the display code ...            01/01/70 00:00      
                                             please switch to the phpBB mode (temporarily)...            01/01/70 00:00      
                                                I can see something's odd, but I don't know what            01/01/70 00:00      
                                       conclusions and maybe a few more ideas            01/01/70 00:00      
                                          coping with the wierdness is my job            01/01/70 00:00      
                                             just a thought            01/01/70 00:00      
                                                Yes            01/01/70 00:00      
   increment the page register            01/01/70 00:00      
      I though of that ...            01/01/70 00:00      

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