Difference between CPLD and FPGA

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nishams

Joined: 06 Dec 2007
Posts: 5

06 Dec 2007 10:57 Difference between CPLD and FPGA

Hi..I would like to know about the difference between FPGA and CPLD. Someone pls help me...NISHAMS

echo47

Joined: 07 Apr 2002
Posts: 4206
Helped: 566

06 Dec 2007 12:50 Difference between CPLD and FPGA

That's a very common question here. Please do a forum search for keywords FPGA CPLD difference. Previous discussions probably contain the answer you need.

huys cobb

Joined: 10 Nov 2006
Posts: 62

07 Dec 2007 5:45 Difference between CPLD and FPGA

For now
The CPLD:

1.The matrix logic.
2.Fuse programming.Even power fail.

FPGA
1.Grass filed logic
2.flexible programming but when power fail,it needs to be reprogramming(it can be trick with external memory opload.

Huys

manasiw2

Joined: 03 Oct 2007
Posts: 40

07 Dec 2007 7:44 Re: Difference between CPLD and FPGA

Hi,
Some differences i'm listing,
FPGAs,
Large no. of flipflops, i.e. sequential logic.
Volatile...need reprogramming on power up(sram based).
can have embeded processors, multipliers n on-chip rams.Also clock management is highly advanced.
for complex applications.
CPLDs,
More amount of combinatoional logic.
PAL based, Once programmed no need of reconfiguration unless design change.
Better predictable delays.
For small designs with large decoding logic and low power consumption.

echo47

Joined: 07 Apr 2002
Posts: 4206
Helped: 566

07 Dec 2007 9:44 Difference between CPLD and FPGA

Some FPGAs have built-in non-volatile flash memory for configuration. For example, the Xilinx Spartan-3AN series.

What is "grass filed logic"?

Last edited by echo47 on 07 Dec 2007 9:56; edited 1 time in total

rameshchand

Joined: 11 Sep 2007
Posts: 118
Helped: 31

07 Dec 2007 9:51 Re: Difference between CPLD and FPGA

field programmable logic device
many time programmable(reprogammable).
it contaains CLB.

Complex programabble logic devices
one time progammable.
PAL logic.

mpatel

Joined: 25 Aug 2005
Posts: 57
Helped: 4

09 Dec 2007 19:43 Re: Difference between CPLD and FPGA

FPGA:
a)SRAM based technology.
b)Segmented connection between elements.
c)Usually used for complex logic circuits.
d)Must be reprogrammed once the power is off.
e)Costly

CPLD:
a)Flash or EPROM based technology.
b)Continuous connection between elements.
c)Usually used for simpler or moderately complex logic circuits.
d)Need not be reprogrammed once the power is off.
e)Cheaper