Table of Contents
5. Digital Signal Processor : CXD2500AQ (IC3)
CIRCUIT DESCRIPTION
Outline
The CXD2500AQ
is a digital signal processing LSI
for a compact disc player, which has the following
functions.
A wide frame jitter margin realized by 32-KRAM (+28
frames}
Bit clocks for strobing EFM signal are generated by
the digital PLL, and the capture range is +150kHz
minumum
Demodulation
of EFM data
Protection
and reinforcement
of EFM frame
sync
signal
Strong error correction
by refined super strategy.
C1: Double
correction, C2 : Quadruple correction
Double-speed
replay and variable pitch replay
Reduction of noise generation at track jumps
Auto zero cross muting
Demodulation of sub-code and detection of errors in
sub-code Q data
5-1. Block diagram
66) FSTT
XTAl
XTAO XTSL
Ei
ar. |
=
Olgitat
PLL
vorl-pitcn
f
ouble
speed
;
>
Timing
5
generator)
sz
Sudcode
€4
processor
Subcode
Q
Processor
fi 1e-tiaes
a
oversampling
filter
CPU interface by serial bus
A builtin servo auto sequencer
Output for digital audio interface
Builtin digital level meter and peak meter
Applicable to bilingual system
Features
Structure
Silicon gate CMOS
Address
generator
7
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