Library manual XBTGC Expert I/O High speed counting | 3 MB

2-Phase HSC Counter
Overview
Introduction
2-Phase HSC Modes Overview
The 2-Phase HSC uses the phase difference between two counter signals to
perform count-up or count-down. There are four modes of phase difference:
Mode 0: 2-Phase*4 (see page 39)
Mode 1: Count + Direction (see page 40)
Mode 2: Up + Down (see page 41)
Mode 3: Two Phases*2 (see page 42)
Mode 0 (2-Phase*4):
The counter counts up or down depending on the order of the inputs.
Mode 1 (Count + Direction):
The counter counts up or down depending on the rising edge of one input and the
value of the other input.
Mode 2 (Up + Down):
The counter counts up or down depending on the rising edge of one input and the
value of the other input.
Mode 3 (2-Phase*2):
The counter counts up or down depending on the rising/falling edge of one input
and depending on the order of the inputs.
2-Phase HSC Specification
Specification of this counter is described in the 2-Phase HSC Specification
(see page 43).
38 04/2012