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Russell Bull
02/23/06 05:09
Read: 468 times
Melbourne
Australia


 
#110575 - Xilinx stuff
Responding to: Erik Malund's previous message

As mentioned by Jan, the main difference is the logic blocks - in fpgas they tend to be finer grained. The Xilinx 9500 series are really just PALS/GALS with interconnects. Each logic block is a 32 input AND/OR (sum of products) array whereas in fpga offering you have a sram based look-up table (LUT) which only has a couple of inputs - thus the difference in 'grainy-ness'.

Fpgas haven't always been sram based, it just that everyone figured that Xilinx was on the right track.

One would probably use a CPLD for glue logic, whereas a fpga would be used for more serious logic. Due to the grainy-ness of CPLDs, they tend to get a little wasteful of the silicon area.


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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