How to Clock any lattice's FPGA....

How to Clock any lattice's FPGA....
should i use any port pin or sp function pin... or only those pins having PLL clk as dual function???

Comments

Lattice Clock (not verified)
October 18, 2007 - 12:37pm

There are special purpose

There are special purpose pins for the devices that you are using to clock lattice device. It would depend ont he lattice device that you use, to find out what exact device you are using. Let me know the device that you are using and may be I can help with a solution.


Anuja
October 20, 2007 - 10:31am

Lattice

hey its from EC1 family very basic device.....


Lattice Clock (not verified)
October 25, 2007 - 2:32am

Got it, go to the following

Got it, go to the following data sheet and page number 67 (also page 4-1).
http://www.latticesemi.com/lit/docs/datasheet...

Here is the list of signal description that would mean clock:
PLL and Clock Functions (Used as user programmable I/O pins when not in use for PLL or clock pins)
[LOC][num]_PLL[T, C]_IN_A I Reference clock (PLL) input pads: ULM, LLM, URM, LRM, num = row from
center, T = true and C = complement, index A,B,C...at each side.
[LOC][num]_PLL[T, C]_FB_A I Optional feedback (PLL) input pads: ULM, LLM, URM, LRM, num = row from
center, T = true and C = complement, index A,B,C...at each side.
PCLK[T, C]_[n:0]_[3:0] I Primary Clock pads, T = true and C = complement, n per side, indexed by
bank and 0,1,2,3 within bank.

Hope that helps.


Anuja
October 27, 2007 - 12:36am

Lattice clocking

  

 Thanks a lot for suggesting a nice guideline regarding clocking.

my one more doubt is:-can I use a port pin which is not having clock as dual function.That means a pin which not belongs to PLL module.


FC guest (not verified)
June 25, 2008 - 8:55pm

Yes, it is possible to use

Yes, it is possible to use any user io to take clock into the fpga. The advantage of using dedicated clock inputs are that it has low injection delay.


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