What is the difference of CPLD and FPGA?

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bunalmis

Joined: 03 Jan 2003
Posts: 254
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Location: Turkey

01 Dec 2003 9:24 difference between cpld and fpga

What is the difference of CPLD and FPGA?

ramesh

Joined: 19 Jan 2003
Posts: 1260
Helped: 5

01 Dec 2003 9:48 difference between fpga and cpld

Elements inside CPLDs are Macrocells(combinational+sequential).Currently CPLDs have maximum of 1024 Macrocells( see Lattice semicondutor make).
Most of them are flash based and are reprogrammable.

Elements inside FPGAs are combinational cell and sequential cells. The Actel FPGAs are available as one time programmable and flash based reprogrammable also. The Xilinx and Altera FPGAs are S-RAM based. The currently available FPGAs have about 2 million gates capacity.

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bunalmis

Joined: 03 Jan 2003
Posts: 254
Helped: 5
Location: Turkey

01 Dec 2003 17:44 cpld fpga difference

Can we say difference of cpld and fpga are dencitiy of macro cells ?

FPGA = very big CPLD

eltonjohn

Joined: 22 Feb 2002
Posts: 1751
Helped: 28

01 Dec 2003 18:15 fpga cpld difference

NO .. The Architecture of a CPLD is different of a FPGA
THE FPGA is like a chess board with every square being a"CELL"
You use a synthesis tool to design .The tools does the mapping of the logic functions in a process called routing .This is very sofisticated and complex . At the end you can generate a REPORT . That will tell you if the timings concerns are met. In a general maner you don't need to worry about the underlaying structure of the FPA .. only in very particular cases when you need to optimize the timing .. FPGA have thousands of gates .. so you are never short! On the other hand a pins can be configured as either an inpur or output or both!

CLPD are diffrent .They have some pins only inputs and some pins that are both . The pins that are inputs go through a CONNECTION MATRIX
that will be programmed by some soft either low or high level description language or schematic using "PRIMITIVES" . In CPLDs you have to be more aware of the internal architecture to get the best out of it :SPEED
But the propagation times are fixed and well known !

CPLD are better to be used when you need very fast logic requirements
like memory mapping in an address bus !

Al Farouk

Joined: 13 Jan 2003
Posts: 195

02 Dec 2003 10:36 what is cpld

see this link it will help
http://www.optimagic.com/faq.html

tlp71@hotmail.com

Joined: 14 May 2002
Posts: 476
Helped: 4

02 Dec 2003 11:54 what is the difference between fpga and cpld

i think that is better taht you search in internet or in the forum about this.
The difference between FPGA and CPLd is no simple to explain in 2 words.
Every farm have products that are CPLD, CPLD-FPGA or FPGA or SOC.
Bye.
G.

AXE
Guest

02 Jan 2004 11:10 difference between cpld & fpga

fpga cpld one is rich for register other is rich in logic

ramesh

Joined: 19 Jan 2003
Posts: 1260
Helped: 5

02 Jan 2004 11:40 difference cpld fpga

The latest FPGA with multi-million gates from ACTEL, ALTERA and XILINX contain the PLLs for delay and different clock multiplication/phase generation and a separate Block of user configurable SRAM in addition to cominational and register logic are embedded.
Some of Xilinx (Vertex family) and Altera (Stratix family) FPGAs do have 16bitx16bit fixed point multipliers and adders for DSP applications. One doesn't find these features in CPLDs.

mit

Joined: 20 Dec 2003
Posts: 12

03 Jan 2004 9:29 cpld fpga differences

FPGA has more gates than CPLD up to million gates per chip but CPLD just in thousand gates rang.

elektrom

Joined: 02 Jul 2001
Posts: 210
Helped: 2

14 Jan 2004 15:13 differences between fpga and cpld

CPLD is flash memory based for configuration. It could run after power-up.
FPGA is SRAM memory based for configuration. It need to configure every time after power-up. It need external configuration memory.

tlp71@hotmail.com

Joined: 14 May 2002
Posts: 476
Helped: 4

14 Jan 2004 15:58 what is the difference between cpld and fpga

dear elektron what do you say it not totlly true, infact lattice make devices FPGA that have a flsh on device and once dowloaded one time you need no other devices to reconfigure it.
Otherwise some FPGA as Actel or Quick logic are OTP.
Bye.
G.

elektrom

Joined: 02 Jul 2001
Posts: 210
Helped: 2

14 Jan 2004 17:23 differences between cpld and fpga

Opps! Sorry, I forgot to mention about some antifuse-based FPGA and flash-based FPGA.

Hero

Joined: 06 Mar 2002
Posts: 145
Helped: 2

14 Jan 2004 22:44 what is cpld?

Hi,

FPGAs have higher logic density than CPLDs but have many disadvantages.

On every power-on FPGA configurtion SRAM need to be configured. Sometimes it makes significant power-on lattency. Also FPGAs are very sensitive on power supply glitches.

Delay times are very dependant on routing process and routing software and always unpredictable. Delay time optimization is difficult with FPGAs especially with large and complex designs.

FPGAs are very good solution for complex logic prototyping e.g. FIFOs, CACHE memories, dual port SRAM, CPU cores and SOCs.

For less complex high speed designs use CPLDs instead FPGAs.

Regards

mandrei

Joined: 10 Jan 2004
Posts: 67
Helped: 2

15 Jan 2004 5:26 diff between cpld and fpga

Agree with elektrom, and i shoud add those:

The best way to think about FPGA's is to think about a Static RAM
For example for Xilinx XC4000 think for an Serial Static RAM programed in serial or in parallel mode via some protocols(see documentation)

The best way to think about CPLD's is to think about a Reprogramabale Nonvolatile Memory (Elash,EEprom etc) and is vendor dependent wich "type" of Reprogramabale Memory is used
For example mostly Altera CPLD's can be viewed as serial EEproms programed via JTAG (serial) or in paralel (by a paralel programer) etc

Of course, thats are chips at the boundary between FPGA and CPLDS (wich has both Volatile Memory and Reprogramable Nonvolatile Memory)

sullybully

Joined: 20 Mar 2002
Posts: 19
Location: Mars

31 Jan 2004 8:50 difference fpga and cpld

http://www2.cs.ucy.ac.cy/~epl121/current_semester/vhdlnew/vhdl_labs/lab_4/ise_lab_lecture_4to6.htm

The above link little bit deffentiates the FPGA and CPLD usages.

zyphor

Joined: 22 Nov 2003
Posts: 100
Helped: 1

14 Feb 2004 4:05 fpga and cpld difference

Hi,
One major difference is that FPGA's line is segmented in the device , but
CPLD's major resource is long line.

suganthi

Joined: 01 Dec 2004
Posts: 1

01 Sep 2005 10:58 difference between pld and fpga

I want to know the architecture of CPLD

echo47

Joined: 07 Apr 2002
Posts: 4206
Helped: 566

01 Sep 2005 11:31 difference between cpld fpga

CPLDs are low-cost and non-volatile, but they are too inflexible for me. Too much like a big old PLD.

If I could buy Xilinx FPGAs with non-volatile config memory, I would never use a CPLD again.

A good way to learn the difference is to download something like Xilinx WebPack, and try implementing various designs into a CPLD and FPGA. Then examine the results.

eDance

Joined: 26 Dec 2002
Posts: 26
Helped: 1

05 Sep 2005 11:38 différence cpld fpga

As I know, CPLD's basic logic unit is product term, and use flash memory to store configuration data. FPGA's basic logic unit is look-up-table, it is RAM based, so a external nonvolatile memory is need to store the configuration data. Generally, FPGA has much more logic capability than CPLD and could be seen within complex applications.

wjx197733

Joined: 21 Sep 2004
Posts: 54
Helped: 1

06 Sep 2005 15:16 difference fpga cpld

The most important thing is when there has no supply, program in fpga will dissapear, but program will still locate in cpld even there has no supply.

steshenko

Joined: 31 May 2002
Posts: 67
Helped: 1

07 Sep 2005 16:39 difference in the code written for fpga and cpld

for example Altera Apex consist of FPGA LUT based cells and macrocells like CPLD. CPLD better for control devices, small decoders, automatic control , etc. FPGA better for DSP aplications

blogGreen88

Joined: 01 May 2006
Posts: 2

08 May 2006 1:55 fpga cpld differences

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salma ali bakr

Joined: 27 Jan 2006
Posts: 973
Helped: 80

08 May 2006 12:25 cpld and fpga difference

the typical basic architecture of FPGA consists of CLB(configurable logic blocks) and routing channels...the CLB consists of a LUT(lookup table) and a flip flop....the routing channels connect the CLB together

hm_fa_da

Joined: 16 Sep 2003
Posts: 193
Helped: 6

22 Jul 2006 15:41 verschil fpga cpld

Thanks to all ,

is there difference between the code written for CPLD and FPGA ? or they use same codes .... ?

Best Regards .

monalishap

Joined: 24 Nov 2008
Posts: 7

24 Nov 2008 8:54 what is the diffference between fpga and cpld

AS I AM NEW TO CPLDs AND FPGAs CAN YOU POST ME SOME DOCUMENTS ON FPGA AND CPLD DIFFERENCES.AND HOW TO DESIGN AN ADC IN THE SPARTAN 3E FPGA.ANY MORE DETAILS ABOUT THE PROGRAMMING PLEASE SEND TO ME.