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Dangerous Prototypes

Other projects => Past projects => CPLD programmable logic => Topic started by: ltj on February 27, 2012, 02:47:17 pm

Title: Oscillator for Lattice CPLD dev board
Post by: ltj on February 27, 2012, 02:47:17 pm
Hi,

I'm going to do a free PCB build of the Lattice CPLD dev board v1. It looks like a nice little chip and I'm going for the LC4032V-25TN44C variant. I can figure out most parts from the board parts list/master parts list but I'm unsure what frequency the oscillator should supply? I can't find anything about external oscillators in the datasheet. From Ian's schematics the osc is connected via a solder-jumper, so it must be optional. Any advice/explanation is welcome. Thanks!

/ltj
Title: Re: Oscillator for Lattice CPLD dev board
Post by: ian on February 27, 2012, 05:35:36 pm
It's optional. You can use the best freq for your app. Here's our general purpose parts for 7x5mm  20 and 50 mhz 3.3volt oscillators:
http://dangerousprototypes.com/docs/Par ... ock_source (http://dangerousprototypes.com/docs/Partlist#Clock_source)
Title: Re: Oscillator for Lattice CPLD dev board
Post by: ltj on February 27, 2012, 08:14:07 pm
@ian, thanks! all I need to know for now :)
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