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SECTION 2 HARDWARE DESCRIPTION

in the next frame as the data pulse occurred that triggered the

signal in the preceding frame.

Figure 2-16 8 Inch MFM Operation

All these signals are used by the Phase Comparator which

adjusts VX. The comparator provides Pump Up and Pump Down

signals, where the period of the pump pulse is the same as the

deviation of the incoming data pulse from the window's center.

See Figure 2-15. This figure shows the internal phase signals,

an early and late data pulse, and the corresponding pump pulses.

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Qume DataTrak 8 Handbuch Seite 26