Problem with Xilinx DCM and FSX output

[tlp71@hotmail.com]

Hi to all.
I am try to using the DCM in VII or VIIPro, i would use only the FSX output to multiply my low in clock.
Xilinx said that this is possible and if intantiating only the DCM whi FSX output.
I try but the simulatuion also post layout work fine but really not work.
Any help or suggestion?
Thanks to all.
Bye

 

[bibo1978]

xilinx dcm data sheet

what was your clock speed at simulation and at HW test

 

[tlp71@hotmail.com]

how to use xilinx dcm

i use a 9 mhz clock in to multipèly for a 4 foactor at 36.
Data sheet said that this frequency range is ok

 

[bibo1978]

xilinx dcm

You can check if the DCM really generate the desired clock using a boundary scan and the chipscope pro, if you have it

 

[it_boy]

using xilinx dcm

Are you sure Xilinx DCMs accept 9 MHz clock inputs??
Asfar as I remember, minimum CLKIN at low frequency mode is 24MHz.

 

[elektrom]

xilinx dcm datasheet

Use architecture wizard to generate DCM code. If it can generate correctly, it should work on real board.

 

[tongson]

dcm reset xilinx

Please check the DCM's reset and clock's skew.

 

[yeewang]

dcm xilinx

pay attention to it_boy's comment and Xilinx datasheet, the input clock should be higher than 24MHz.

 

[kilone]

dcm xilinx low frequency mode

Yeah, 24MHz, Even I am using 24.576MHz clock input, my FSX outputs are sometimes stable, sometimes not.

That's the real story of mine!

If your input can only be 9MHz, I think you can try Altera's PLL...

 

[mic_huhu]

xilinx 9 mhz

thanks all .