Rev. 1.0, 02/00, page 732 of 1141
Bit 0
DFG Edge Selection Bit (DRF): Selects the edge of the NCDFG signal used in the drum
speed error detector.
Bit 0
DRF
Description
0
Selects the rising edge of NCDFG signal
(Initial value)
1
Selects the falling edge of NCDFG signal
Operation
The DFG noise removal circuit generates a signal (NCDFG signal) as a result of removing noise
(signal fluctuation smaller than 2
φ
) from the DFG signal. The resulted NCDFG signal is behind
the time when the DFG signal was detected by 2
φ
. Figure 26.71 shows the NCDFG signal.
DFG
NCDFG
Noise
2
φ
2
φ
2
φ
φ
= fosc
Figure 26.71 NCDFG Signal