There is none on this website. But it is not too difficult to create a syntax highlighting definition. The main problem is to get all keywords. I use normally the manual or help of the application which reads or writes a file to get all keywords.
I entered
syntax highlighting ucf xilinx in Google and amongst others I found this page
PSPad editor extension. On this page is a link to a zip archive which contains an INI file which I think contains the list of keywords you need.
With the UltraEdit help page about
Syntax Highlighting, the
Template for syntax highlighting language wordfile and my
3 ultimate syntax checking macros you should be able to create the UCF file by yourself. If you need further help, upload in a zip archive the wordfile you have already created and an example file and describe what is not working as you want. I will try to help you to fix that.