Comments on: How-to: Programmable logic devices (CPLD)

By: ebidk

ebidk — Tue, 24 Nov 2009 13:36:52 +0000

Nice article :)

I’ll have to look into playing with this.

I want to do FPGA too but so far it’s been too expensive for me to get into just for playing around.

It looks like CPLD is related enough to give me some idea if I want to spend the money on FPGA and at a nice low price too.

By: tedy_b

tedy_b — Mon, 18 May 2009 12:40:05 +0000

Thank You very mutch

By: tedy_b

tedy_b — Mon, 18 May 2009 12:25:41 +0000

Thenk You very mutch

By: Josh

Josh — Wed, 25 Mar 2009 19:03:47 +0000

Is the system clock just on a general purpose I/O pin on the CPLD??

By: garden gates

garden gates — Mon, 16 Mar 2009 21:46:43 +0000

I don’t normally comment on blogs but your post was a real help. Thank you for a great topic, I will be sure to bookmark your site and check it out again. Cheers, Amy xXx.

By: yyy

yyy — Wed, 11 Feb 2009 12:57:32 +0000

Most PLD vendors offer free tools for their low cost CPLD and FPGA families. The more recent CPLD families from Lattice and Altera are more like mini-FPGA with lots more logic than previous CPLD families.

By: Levent BAL

Levent BAL — Mon, 19 Jan 2009 21:50:03 +0000

hi,

I have a xilinx XC7532XL cpld.I had sent a programme my cpld,then I could not erase this programme from my cpld.Do you know what I can erase it.

I got this look alike error message “erase protect device”

You should in stand alone erase mode.I dont know to set my cpld for this situation.

By: bigman

bigman — Fri, 19 Dec 2008 07:16:11 +0000

hackman,

fpga’s and cpld’s are not normally used for final production. they are more commonly used for development and such until a final logic design is decided upon at which time a huge order of custom logic circuits are ordered. fpga’s name even suggests so (field-programmable gate array).

By: hackman

hackman — Sun, 14 Dec 2008 00:43:48 +0000

i dunno. i used to look at FPGA’s and cpld’s in awe like this article, but over the years I’ve come to the conclusion that they are pretty worthless for final production designs. they add to bill of materials costs, they suck up a lot of power, and with new PIC’s implementing the peripheral pin select feature, software programmable re-routing of pins is no longer a problem. if you can design your project to only use a microcontroller, you can constantly beat a cpld/fpga design over the head with lower power consumption and lower bom cost.

the only time i’d consider a fpga/cpld is if i needed something to interface at maximum speeds and where cost, power consumption, and board space is no longer an issue. however, as microcontrollers continue to get faster and integrate more high speed interface peripherals, even that reason may become dubious at some point.

By: Alan

Alan — Sat, 13 Dec 2008 18:54:35 +0000

Interesting read. Thanks Ian.

By: y8

y8 — Sat, 13 Dec 2008 05:11:22 +0000

Thanks. GOOD GOOD

By: Tachyon

Tachyon — Sat, 13 Dec 2008 01:51:59 +0000

This would be a great way to run a neural net at full speed without having to build it physically.

By: detox

detox — Fri, 12 Dec 2008 23:00:42 +0000

This is too sweet. Anyone looking into digital logic or even Crestron programming should get one of these. crestron processors are basically large versions of these

By: aoeu

aoeu — Fri, 12 Dec 2008 22:30:35 +0000

regarding the lowercase thing, _everything_ here is in lowercase, see the css:

* {
text-transform: lowercase;
}

how could i not notice. the two only capital letters on this page are in “submit comment”. wow, it’s like this psychology study, where a guy ask a unsuspecting stranger for directions, they replace him with somebody else and the stranger doesn’t notice.

By: ATP

ATP — Fri, 12 Dec 2008 22:25:00 +0000

holy crap, you broke my brain. I was all ready and able to learn about this stuff, but this bite was WAY too big. I guess I’ll have to take smaller bites. Great in-depth article, though. I really do appreciate the painstaking detail, because it fits better with my learning style. Now if somebody could just explain to me how/why these things work, I’d be a master.

I will venture into this unknown frontier soon, I know.