same features & pin compatiblity with xilinx cpld

EDAboard.com Forum Index -> PLD, SPLD, GAL, CPLD, FPGA Design -> same features & pin compatiblity with xilinx cpld

Author

Message

shraddha

Joined: 08 Jan 2007
Posts: 37
Helped: 1

22 Mar 2007 12:47 same features & pin compatiblity with xilinx cpld

hi,
now i am using xilinx's cpld XC9536XL-44pin.
i want cpld from another manafacturer having same features & pin compatiblity with XC9536XL.
for this should i do any other changes with my pcb also so that i can use any other manafacturer's 44pin cpld?
i have searched altera's site but of no use

banjo

Joined: 24 Dec 2005
Posts: 644
Helped: 118

22 Mar 2007 13:12 same features & pin compatiblity with xilinx cpld

I know of no larger CPLDs that are pin compatible. Back in the old days of DIP parts, you could find CPLDs with the same pinout from numerous vendors. Chips like the 22V10, etc. Today, everything is proprietary. The pin outs do not remain the same even within the same manufacturer across families. That is if you have one FPGA using a certain BGA arrangement, the next generation part using the same BGA package will not be pinout compatible!

If you want multiple vendors for your CPLD, then I think you need multiple footprints on the PCB. Sometimes you can place one footprint on each side of the PCB, this reduces the routing differences when switching between vendors. Other times, we have had to just place the two alternative parts side by side on the PCB.

However, often the best option is to just get on a scheduled delivery with the manufacturer. If you can forecast your volume, usually they can keep the parts pipeline full. With programmable parts, multiple vendors also means multiple logic development, multiple toolsets, and lots of headaches making sure ECN are implemented across all CPLD suppliers.

Google
AdSense
Google Adsense

22 Mar 2007 13:12 Ads

prajit

Joined: 20 Mar 2007
Posts: 60
Helped: 8
Location: Seoul

22 Mar 2007 13:15 Re: same features & pin compatiblity with xilinx cpld

Difficult to get with similar spec and pin configuration from other manufacturers......sometimes back I was searching for it and I found XC9536 as the best option.... U can also try in Lattice semiconductor or Atmel ......

Though you can define your I/O pins and make it compatible to the present configuaration but the power pins will be different..so u have to design your PCB again if you change the CPLD...