External Clock

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MaPo_4324361
Level 1
Level 1
First like given

Hello,

I'm considering using the PSOC5LP in my design.

One of the requirements is clock synchronization, i.e. I need to apply an external clock into the PSOC (and other devices) from external external PLL device.

I saw that there is an option to apply an external XTAL ('MHzECO').

Is it posiible to apply just a Clock signal (say LVDS/LVPECL logic level), without using a XTAL?

Thanks!

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1 Solution
Len_CONSULTRON
Level 9
Level 9
Beta tester 500 solutions authored 1000 replies posted

MaPo,

In short, the answer is YES.

In order to use an external clock as an input source, you need to:

  • Allocate an input pin to use on the TopDesign.  Give it a net name such as "ext_clk"

pastedImage_4.png

  • Open the DWR with the Clocks Tab and Edit Clock...

pastedImage_6.png

  • Select the following in this order shown in the pic below.

pastedImage_15.png

I hope this helps.

Len

Len
"Engineering is an Art. The Art of Compromise."

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1 Reply
Len_CONSULTRON
Level 9
Level 9
Beta tester 500 solutions authored 1000 replies posted

MaPo,

In short, the answer is YES.

In order to use an external clock as an input source, you need to:

  • Allocate an input pin to use on the TopDesign.  Give it a net name such as "ext_clk"

pastedImage_4.png

  • Open the DWR with the Clocks Tab and Edit Clock...

pastedImage_6.png

  • Select the following in this order shown in the pic below.

pastedImage_15.png

I hope this helps.

Len

Len
"Engineering is an Art. The Art of Compromise."
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