CXD2598Q Datasheet, PDF (67/147 Pages) Sony Corporation – CD Digital Signal Processor with Built-in Digital Servo and DAC

CXD2598Q
Timing Chart 2-5
Reference window
(132.2kHz)
Measurement interval (approximately 3.8µs)
Measurement pulse
(V16M/2)
Measurement counter
VF0 to 9
Load
m
The relative velocity R of the disc can be expressed with the following equation.
R=
m+1
32
(R: Relative velocity, m: Measurement results)
VF0 to VF9 is the result obtained by counting V16M/2 pulses while the reference signal (132.2kHz) generated
from XTAL (XTAI, XTAO) (384Fs) is high. This count is 31 when the disc is rotating at normal speed and 63
when it is rotating at double speed (when DSPB is low).
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