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Libraries Guide
Chapter 3: Design Elements (ACC1 to BYPOSC)

BYPOSC

Bypass Oscillator

XC3000
XC4000E
XC4000X
XC5200
XC9000
Spartan
SpartanXL
Spartan2
Virtex
N/A
N/A
N/A
Primitive
N/A
N/A
N/A
N/A
N/A

BYPOSC provides for definition of a user clock for the charge pump via its I pin. When the BYPOSC symbol is not used or its I pin is not connected, the charge pump uses an internal clock.