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Visitor rilhas
Visitor
6,851 Views
Registered: ‎02-17-2011

CoolRunner II Starter Kit IC3 Oscillator

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Hi,

 

Does anyone know the details about oscillators in the CoolRunner II Starter Kit rev. D? I'm interested in getting the board to operate at a much higher frequency than the 1MHz of the LTC6900, and I would like to use an oscillator on socket IC3 (8 pin DIP).

 

The manual just states "A socket for a standard half-size DIP oscillator is provided at location IC3", but that is not enough information for me to understand what "standard" and "half-size DIP" mean.

 

Does anyone know the 8-pin socket pinout? Or what oscillator part numbers are compatible with this IC3 socket? Maybe a part number from Farnell or Mouser? Does anyone know what the upper frequency limit for this oscillator is?

 

Thanks!

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1 Solution

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Instructor
Instructor
8,470 Views
Registered: ‎08-14-2007

Re: CoolRunner II Starter Kit IC3 Oscillator

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The standard 1/2 DIP oscillator only uses the 4 corner pins of the 8-pin DIP footprint and

from my experience the pinout is standard, but you need to select the proper operating

voltage, frequency, logic standard, and fourth pin function (usually either none, power

down, or output enable).  Here's a representative 1/2 DIP 3.3V oscillator from DigiKey:

 

OSCILLATOR 32.000MHZ 3.3V 1/2-SZ

 

CoolRunner II can run pretty fast.  I don't think you'll have problems with most

off-the shelf oscillators (under 100 MHz).  What frequency do you need for your

project?

 

-- Gabor

-- Gabor

View solution in original post

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6 Replies
Instructor
Instructor
8,471 Views
Registered: ‎08-14-2007

Re: CoolRunner II Starter Kit IC3 Oscillator

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The standard 1/2 DIP oscillator only uses the 4 corner pins of the 8-pin DIP footprint and

from my experience the pinout is standard, but you need to select the proper operating

voltage, frequency, logic standard, and fourth pin function (usually either none, power

down, or output enable).  Here's a representative 1/2 DIP 3.3V oscillator from DigiKey:

 

OSCILLATOR 32.000MHZ 3.3V 1/2-SZ

 

CoolRunner II can run pretty fast.  I don't think you'll have problems with most

off-the shelf oscillators (under 100 MHz).  What frequency do you need for your

project?

 

-- Gabor

-- Gabor

View solution in original post

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Teacher eteam00
Teacher
6,840 Views
Registered: ‎07-21-2009

Re: CoolRunner II Starter Kit IC3 Oscillator

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And similar device from Mouser.

 

-- Bob Elkind

SIGNATURE:
README for newbies is here: http://forums.xilinx.com/t5/New-Users-Forum/README-first-Help-for-new-users/td-p/219369

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2. Search the forums (and search the web) for similar topics.
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5. Students: Copying code is not the same as learning to design.
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Xilinx Employee
Xilinx Employee
6,801 Views
Registered: ‎09-22-2008

Re: CoolRunner II Starter Kit IC3 Oscillator

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  • You can use higher frequency than 1 M Hz. No problem. LTC6900 supports 1kHz to 20MHz Frequency Range (Refer data sheet LTC6900 from http://www.linear.com/product/LTC6900 ). You can use an oscillator on socket IC3 (8 pin DIP). No issue.
  • Half size means 8-pin DIP Socket size. In general Crystal oscillators available in half size (8-pin DIP socket size) or normal/full size (14-pin dip socket size). In Half size DIP crystal oscillator

Thanks & Regards

Mahesh

 

 

Kind request:

 

To users: Kindly accept particular post which helped you.

 

Forum moderator: Please KUDO if you think Answer is OK

 

 

Mahesh
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Visitor rilhas
Visitor
6,786 Views
Registered: ‎02-17-2011

Re: CoolRunner II Starter Kit IC3 Oscillator

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Hi! Thanks for your reply!

 

I have used such oscillators in the past, my main problem is with the IC3 pinout. But if my interpretation of your tip is correct then I'll be able to try it out (I'll measure for voltage - probably 3.3V - and try to detect if the 4th pin has any functionality by guessing... I think it is likely that it is not used, is the only way to explain why Xilinx would not have commented further on it!).

 

I would like to get 60MHz of above, but not for any specific project. I'm using the CoolRunner II Starter Kit as a development platform that I use to try out other chips and solutions, generate test signals, etc., and I would like to get it to run as fast as possible (although my oscilloscope is prety much useless beyond about 60MHz) as I find it to be a great complement to microcontroller-based test platforms that I already use.

 

Thanks again!

 

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Visitor rilhas
Visitor
6,781 Views
Registered: ‎02-17-2011

Re: CoolRunner II Starter Kit IC3 Oscillator

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1. Yes. Nothing else ther but the sentence I copied.

2. I did. Nothing came up. In fact, since I didn't get notified of the replies you guys posted here, I googled "coolrunner ic3" and my post came up first. So, trusting Google, I guess there was nothing else on the web that was close to what I needed.

... and Kudo to you for reminding us of the tips! :-)

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Visitor rilhas
Visitor
6,781 Views
Registered: ‎02-17-2011

Re: CoolRunner II Starter Kit IC3 Oscillator

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Thanks for your reply. I've used LTC6900 before, but it is already assembled on the starter kit with 3 frequency options, being the highest 1MHz )that's what I meant by "1MHz of the LTC6900", in the context of the starter kit.

PS: I have accepted Gabor's solution and now it seems I can't accept any other, altough yours is also very helpful. So, for what its worth, thanks-and-accepted-as-solution! :-)
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