Programmable Devices
CPLDs, FPGAs, SoC FPGAs, Configuration, and Transceivers
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Using GCLK by a Quartz Crystal

Altera_Forum
Honored Contributor II
‎07-02-2008 09:04 PM
1,200 Views

Hi all, 

 

Can I use a quartz crystal to drive the GCLK pin of FPGAs? I mean just like the microcontroller XTAL pin which needs a quartz crystal with 2 capacitors? 

 

 

Thanks in advance.
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Altera_Forum
Honored Contributor II
‎07-02-2008 09:18 PM
314 Views

No, you need a crystal oscillator or an unbuffered CMOS inverter to build an oscillator.

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Altera_Forum
Honored Contributor II
‎07-02-2008 09:42 PM
314 Views

thnx man for ur fast answer ;)

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Altera_Forum
Honored Contributor II
‎07-03-2008 05:59 AM
314 Views

That's an interesting question, though! Has anybody here ever tried to use the FPGA itself to build a crystal oscillator? It's quite easy to have a simple inverter from on pin to another. So after configuration, the FPGA should oscillate with the crystal. Any experience with that?

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Altera_Forum
Honored Contributor II
‎07-03-2008 10:38 AM
314 Views

There have been some discussions of this on the comp.arch.fpga newsgroup. It isn't at all reliable. 

 

Leon
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