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Jan Waclawek
02/22/06 16:46
  02/22/06 16:49

Read: 534 times

#110549 - you don't
Responding to: Mahmood Elnasser's previous message
Basically, you don't copy protect. Mind, FPGAs are mainly used in big and expensive equipment by renowned manufacturers, such as sommunication equipment and military stuff. Protected mainly by lawyers.

But if you want to do it desperately, you need some support from the manufacturer. There are nonvolatile memory based FPGAs available from Actel, there are also some conventional FPGAs with integrated configuration memory (although I would'n bet on it's not a multichip package).

Just a small thingy, I wouldn't call FPGAs a combination of CPLDs, it is rather a collection of very small cells, much smaller than the smallest CPLDs, but a lot of them. The idea came from the standard gate-array, "programmed" by the last (few) metallic layer. CPLDs are descendants of PROMs, rather (PROM->PAL->GAL->CPLD; came from a company called MMI).

Jan Waclawek

List of 25 messages in thread
FPGA/CPLD      Erik Malund      02/22/06 14:46      
   differences      Jez Smith      02/22/06 14:53      
      SRAM      Mahmood Elnasser      02/22/06 15:50      
         you don't      Jan Waclawek      02/22/06 16:46      
            Security      Andy Neil      02/23/06 00:23      
            FPGA's were MMI's also ...      Richard Erlacher      03/04/06 11:20      
         copying      Jez Smith      02/22/06 23:15      
            Re: comparison      Valentin Angelovski      02/22/06 23:53      
               Incorrect?      Andy Neil      02/23/06 07:02      
                  No, however...      Valentin Angelovski      02/23/06 15:49      
                  about FPGA in 8052?      M Chitrakar      02/28/06 10:21      
                     In a way yes.      Kalpak Dabir      02/28/06 11:08      
                     i heard      M Chitrakar      03/01/06 07:12      
                        Low cost      Andy Neil      03/01/06 14:39      
                        FPGA vs microcontroller      Andy Peters      03/01/06 18:14      
      Not necessarily      Andy Neil      02/22/06 23:53      
      You know it makes sense!      Andy Neil      02/22/06 23:55      
         yeah well      Jez Smith      02/23/06 00:05      
   Xilinx stuff      Russell Bull      02/23/06 05:09      
      Flash based      Andy Neil      02/23/06 06:59      
   Basic logic elements differ      Oliver Sedlacek      02/23/06 08:12      
      It seems...      Jez Smith      02/23/06 09:22      
         Consensus      Oliver Sedlacek      02/24/06 02:21      
      practical consequence      Jan Waclawek      02/23/06 23:43      
   Jan, Try reading this post      Jez Smith      02/24/06 00:09      

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