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Jan Waclawek
02/23/06 23:43
Read: 473 times
Bratislava
Slovakia


 
#110649 - practical consequence
Responding to: Oliver Sedlacek's previous message
One practical consequence of the different "history"/buildup of CPLD and FPGA: as CPLDs are multiple PAL/GAL which is a huge programmable AND/OR array plus a handful of "macrocell" as the only place having registers/latches, they are not suited for sequential logic (i.e. requiring registers/latches), but very well suited for very wide input combinatorial logic (= address decoding)("glue logic", said somewhere above).
On the other hand, each of the many many small "cell" in FPGA contains a register/latch, hence a complex xombinatorial logic can be built; but wide input combinatorial logic might have serious timing problems (needs to chain a lot of "cells").

Jan Waclawek

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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