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Jez Smith
02/22/06 14:53
Modified:
  02/22/06 15:04

Read: 628 times
Birmingham
England


 
#110541 - differences
Responding to: Erik Malund's previous message
cpld can be thought of as alarge number of interconnected simple PAL devices with simple interconnections, and FPGA is a large number of interconnected CPLDs with addition features such as on board memory,high speed memory interfaces,some have ethernet macs,hardware multipliers,DSP blocks and some have built in processors.The other main difference is a cpld retains its configuration if it is powered down a fpga is sram based so it needs to have its configuration rewritten each time it is powered up usualy from a serial eeprom.Also FPGAs generaly have configuarble I/O blocks which means that they can support adaptive output impeadance which is vital for high speed boards with long traces.
The latest FPGAs are now targetted at 'system on chip' designs devices like the xilinx virtex 4 are seriously powerful
http://www.nuhorizons.com/cpld/Gett...xCPLD.html

http://www.xilinx.com/products/...x/virtex4/



List of 25 messages in thread
TopicAuthorDate
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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