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Observer lino89
Observer
11,085 Views
Registered: ‎09-22-2013

clock input in spartan 3

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i am using spartan 3 xcs400 tq144 starter kit for my design and i need to give clock input  to the design.

i am used to give the input by program but for this design i need to use the clock already available on the board.

pls help me to resove this problem

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1 Solution

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Xilinx Employee
Xilinx Employee
17,454 Views
Registered: ‎01-03-2008

Re: clock input in spartan 3

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Input buffers (IBUF, IBUFG, IBUFDS, IBUFGDS) pass external signals to the intrnal logic and output buffers (OBIF, OBUFDS) pass internal signals to external logic. So, yes if you assign an input buffer to the same pin that is connected to a clock signal and you have also assigned a compatible IOSTANDARD then the clock will be propagated to the internal logic.
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6 Replies
Xilinx Employee
Xilinx Employee
11,074 Views
Registered: ‎02-06-2013

Re: clock input in spartan 3

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Hi

 

you can use the on board clock for your purpose.

 

If you can give more details of the exact spartan3 kit you are using and what exactly your issue on using the

 clock present on the board.

 

We will be able to give you more suggestions.

Regards,

Satish

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Observer lino89
Observer
11,071 Views
Registered: ‎09-22-2013

Re: clock input in spartan 3

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spartan 3 xcs400 - tq144

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Observer lino89
Observer
11,063 Views
Registered: ‎09-22-2013

Re: clock input in spartan 3

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to use on board clock which pin no: i have to assign 

spartan 3 xcs400- tq144

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Scholar pratham
Scholar
11,054 Views
Registered: ‎06-05-2013

Re: clock input in spartan 3

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Hello,

I am not sure the board you are using but its from digilent then you should check this user guide

http://www.digilentinc.com/Data/Products/S3BOARD/S3BOARD_RM.pdf (Page no 35)

If the board is from different vendor you should be checking board user guide it should have the details about the board clock pin and all

-Pratham

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Observer lino89
Observer
11,050 Views
Registered: ‎09-22-2013

Re: clock input in spartan 3

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if i assign input pin any of the gclk will it use input from the on board clock

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Xilinx Employee
Xilinx Employee
17,455 Views
Registered: ‎01-03-2008

Re: clock input in spartan 3

Jump to solution
Input buffers (IBUF, IBUFG, IBUFDS, IBUFGDS) pass external signals to the intrnal logic and output buffers (OBIF, OBUFDS) pass internal signals to external logic. So, yes if you assign an input buffer to the same pin that is connected to a clock signal and you have also assigned a compatible IOSTANDARD then the clock will be propagated to the internal logic.
------Have you tried typing your question into Google? If not you should before posting.
Too many results? Try adding site:www.xilinx.com