cxd2548r Sony Electronics, cxd2548r Datasheet - Page 54

• Manufacturer Part Number: cxd2548r
• Description: Cd Digital Signal Processor With Built-in Digital Servo And Dac
• Manufacturer: Sony Electronics

CXD2548R
Timing Chart 2-18
Measurement interval (approximately 3.8µs)
Reference window
(132.2kHz)
Measurement pulse
(VCK1/2)
Measurement counter
Load
m
VF0 to 7
The relative velocity of the disc can be obtained with the following equation.
m + 1
R =
(R: Relative velocity, m: Measurement results)
32
VF0 to 7 is the result obtained by counting VCKI/2 pulses while the reference signal (132.2kHz) generated
from the crystal (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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