Description

How do I lock a CLKDLL to a specified DLL in Virtex?

Solution

Users can lock a CLKDLL down in the UCF file.

In the UCF file, use the following syntax:

Virtex:

INST <DLL_instance> LOC = dll<x>

where <x> is the number 0 to 3.

EX: INST MY_DLL LOC = dll1

Virtex-E:

INST <DLL_instance> LOC = dll<xy>

where x is the number 0 to 3, and y is the letter p (for primary) or or

s (for secondary).

EX: INST MY_DLL LOC = dll1P