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???
08/21/06 20:28
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 		 #122735 - rubbish
Responding to: ???'s previous message
Richard Erlacher said:
just exactly how would you propose to drive, say, 136 power FETs from an FPGA that operates on 1.2 volts and "tolerates" 3.3 volts?


Certainly not with a 5-volt 8051, but you didn't wanted to know that. BTW, looks like you confuse INT with I/O supply, but that's just a detail.

Richard Erlacher said:
There are lots of FETs and FET drivers that like a 5-volt interface. It's only been in recent months that 1.5 volt compatible FETs have been available.


There are lots of 3,3V drivers as well. And somehow i don't get
why you ride on your sub 3,3V levels, because of now - including
90nm FPGAs - they all operate with 3,3 VCCIO with no problem.
Even if you had to levelshift to 5V or above, in such an application, the level shifters would be insignificant.

Richard Erlacher said:
I doubt that they're cheap, and I doubt they can handle the drive that's required to fire a solenoid or relay coil.The result is that one has to add buffers/level-shifters that then raise the system cost to far above what it would have been had the FPGA been omitted and simple SSI/MSI or MCU's been used.


Please enlighten me, i haven't seen a standard MCU that would be able to drive a relay coil directly.

Cheers, Roger

List of 70 messages in thread
TopicAuthorDate
stand alone fpga            01/01/70 00:00      
   Whose FPGA?            01/01/70 00:00      
      thanks            01/01/70 00:00      
         The answer is...            01/01/70 00:00      
            needed to hear it from the horse's mouth            01/01/70 00:00      
               Who is the horse in this instance?            01/01/70 00:00      
                  The Stallion            01/01/70 00:00      
         or if you are feeling brave..            01/01/70 00:00      
         which Altera            01/01/70 00:00      
            No Altera or Xilinix yet            01/01/70 00:00      
               the first book to teach by            01/01/70 00:00      
                  Altera development boards            01/01/70 00:00      
                     Jez, Mahmood If you want            01/01/70 00:00      
                        ive got baseband version 10.2            01/01/70 00:00      
                  Logic book            01/01/70 00:00      
                     It assumes you know about that            01/01/70 00:00      
                        Skahill's VHDL book            01/01/70 00:00      
                           Exactly!            01/01/70 00:00      
               Why not yet?            01/01/70 00:00      
                  Deadline            01/01/70 00:00      
   RTFDS            01/01/70 00:00      
      datasheet for what device?            01/01/70 00:00      
         There are "family" data sheets that are adequate            01/01/70 00:00      
      Kittens are cute, but ...            01/01/70 00:00      
         awww poor Tiddles            01/01/70 00:00      
            The best cat            01/01/70 00:00      
               ha ha didnt work            01/01/70 00:00      
                  He didn\'t do anything to stop me when...            01/01/70 00:00      
   Why oh why didn\'t the Horse tell me?            01/01/70 00:00      
      This particular horse thought you knew            01/01/70 00:00      
      This "horse" doesn't want you to notice            01/01/70 00:00      
         This horse won the race!            01/01/70 00:00      
            Every bit of it is on their website!            01/01/70 00:00      
         been there, done that            01/01/70 00:00      
            do they still make FPGA's that small?            01/01/70 00:00      
               Small FPGAs            01/01/70 00:00      
                  a colleague said, \"the gates are free\"            01/01/70 00:00      
                     maybe for small parts            01/01/70 00:00      
                        depends on where you get pricing            01/01/70 00:00      
                     yield            01/01/70 00:00      
                  small fpga---try altera acex            01/01/70 00:00      
                     What I like to compare is a 33-bit AND gate            01/01/70 00:00      
                     CycloneII is the way to go            01/01/70 00:00      
                        Well, most 805x's run at 5 Volts ...            01/01/70 00:00      
                           well, nope            01/01/70 00:00      
                              depends on how you use 'em.            01/01/70 00:00      
                                 do you read the posts or just the titles?            01/01/70 00:00      
                                    Yes, I read 'em, but that doesn't make it so ...            01/01/70 00:00      
                                       rubbish            01/01/70 00:00      
                                          Don't be so sure ...            01/01/70 00:00      
                                             ...are you?            01/01/70 00:00      
                                                we've drifted            01/01/70 00:00      
                                             FPGA usage            01/01/70 00:00      
                                 how many do you need?            01/01/70 00:00      
                           High speed logic woe            01/01/70 00:00      
                              seen them all            01/01/70 00:00      
                              FPGA clock skew            01/01/70 00:00      
                                 I agree...but            01/01/70 00:00      
                                    WOW            01/01/70 00:00      
                        yeah well            01/01/70 00:00      
               other choices            01/01/70 00:00      
                  and there's Altera's MAX-II, too            01/01/70 00:00      
                     all different manufacturers            01/01/70 00:00      
                        ah ha well portablitly yes and no,            01/01/70 00:00      
                        crawl before you walk            01/01/70 00:00      
                           I'd get the belly even closer to the floor            01/01/70 00:00      
                              the problem with them is programming            01/01/70 00:00      
                        Multibrand HDL is like multiplatform in C            01/01/70 00:00      
                        code portability            01/01/70 00:00      
      since the beginning of time            01/01/70 00:00      

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