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Clock source IP is not generating the frequency provided in "clock frequency" parameter of the IP.

UTech
Beginner
461 Views

I'm using "Clock Source" IP provided by Altera in the QSYS. I gave 250MHz in "clock frequency" parameter, but it is providing only 100MHz from its output Clock interface. I confirmed it using Signal tap logic analyzer by sampling the clock at double its frequency (based on Nyquest theorem). My question is, why Clock source IP is not able to provide the frequency I gave in Clock frequency parameter, is their something I'm missing out while generation?

 

Technical Details:

FPGA : Stratix V

Part Name : 5sgxea7k2f40c2

FPGA Board : Bittware S5-PCIe-HQ

Clock pin : PIN_J23 (S5CLK16_P)

IP : Clock Source (Author : Altera Corporation, Version : 15.1)

Software : Quartus Prime Standard Edition 15.1

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4 Replies
sstrell
Honored Contributor III
128 Views

The Clock Source component is just for distributing a clock to the rest of the system design. It does not generate or change an incoming clock. The parameter value you mention is just for timing constraint purposes. What clock are you providing to the Platform Design system? If you want it to be 250 MHz, you have to generate it from an outside source, like a PLL.

 

#iwork4intel

UTech
Beginner
128 Views

I connected the exported input clock interface of Clock Source IP and connected it to PIN_J23 of FPGA. it might be connected to 100MHz on-board oscillator. Is it possible to generate 250MHz frequency other than using PLL?

sstrell
Honored Contributor III
128 Views

You could build your own logic to do it, but the easiest way is to simply use a PLL.

 

#iwork4intel

SreekumarR_G_Intel
128 Views

Hello there .

Thank you all for replying, Can you let me know if you have any questions on the same ?

 

Thank you,

 

Regards,

Sree

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