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???
05/13/10 19:18
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#175871 - thanks everyone
Responding to: ???'s previous message
Thanks for the Help! I should have guessed the big semiconductor companies wouldn't let us understand their products, how else could they make $100+ for all their development kits, IDEs and programmers so we can use their $2 chips. JW thanks for giving me a general idea of how the flash is accessed to be programmed. Using multiplexers to switch in and out internal circuits would allow access to the flash as well as protect other circuits on the chip from the higher programming voltages. as for how the flash is programmed, correct me if i'm wrong but it is a process called hot-electron injection in which higher voltages and currents pass across the source and drain of a MOS transistor. The transistor has a floating gate that collects stray electrons on their way across the channel. once there they become trapped and build up a charge that changes the bias on the transistor, giving you a logic zero. This is like when electrons in a vacuum tube strike the grid on their way to the plate and become trapped there. if they are not allowed to return to ground the grid will develop a negative bias and cutoff current through the tube.

List of 19 messages in thread
TopicAuthorDate
programing on chip flash?      Douglas Brummund      05/13/10 13:44      
   of course, you are,      Erik Malund      05/13/10 14:33      
   parallel programming      Jan Waclawek      05/13/10 15:36      
   thanks everyone      Douglas Brummund      05/13/10 19:18      
      Not exactly fair      Andy Neil      05/14/10 00:48      
      too deep      Stefan KAnev      05/14/10 01:48      
         Internal voltage doublers in some chips for IAP support      Per Westermark      05/14/10 03:14      
            hm      Stefan KAnev      05/14/10 03:58      
               actually ...      Erik Malund      05/14/10 04:32      
               why to do this? I cant understand :-(      Andy Neil      05/14/10 04:37      
                  the Manzi book      Erik Malund      05/14/10 05:17      
                     You mean, "Mazidi"      Andy Neil      05/14/10 06:17      
                        agreed, and ...      Erik Malund      05/14/10 06:26      
            ISP before IAP?      Andy Neil      05/14/10 04:41      
               A question of driving force      Per Westermark      05/14/10 04:54      
      baloney      Erik Malund      05/14/10 04:35      
   programming on chip flash?      Douglas Brummund      05/17/10 20:28      
      If only it were that simple...      Andy Neil      05/18/10 00:13      
      did you read my remark above...      Jan Waclawek      05/18/10 00:47      

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