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Description Of Signal Names - Philips 70DCC600 Service Manual

Digital compact cassette recorder
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Description of signal names
Signal name
Signal flow
Function
128Fs
SBC --> n.C.
clock
256Fs
SBC ..... DAI
system clock
SBC --> SBF
SBC --> ADC
SBC --> DAC
SBC --> ADAS
Explanation
Clock output from SBC, 128 x sampling frequency.
Master clock signal (256 x sampling frequency) for SBF,
DAI, ADC, DAC and ADAS. Is generated by SBC with
exception of the mode Digital Record. In that case the DAI
is the MASTER and supplies 256Fs on MSTCK pin. See
also MSTCK.
Fs=32 kHz for DAB, DSR or BS (digital audio broadcast).
Fs = 44.1 kHz for CD and DCC.
Fs=48 kHz for professional recording and OAT.
ADRSO
ADRS1
ADRS2
ADRS3
ADRS4
ADRS5
ADRS6
ADRS7
ADSDI
ADSEL
ANA L
ANA R
ASL
An
AnDAC
AUX
AUXENV
AZCHK
BIASA
BIASD
CAP A
CAP B
CAPSTAN
CASN
CHO
CH1
CH2
CH3
CH4
CH5
CH6
CH7
CHROME
DDSP --> DRAM
ADC --> DAI
DAI --> gnd
read amp --> analog Pb
equalization
DAI --> +5V
SBC --> DAC
SBC --> DAC
DEQ --> DDSP
DEQ --> Main IlP
DDSP --> test pin
DEQ --> high
DEQ --> low
Capstan motor --> speed
control
Main IlP --> 7359
DDSP --> DRAM
DEQ --> DDSP
RE Deck electronic -->
Analog Pb equalization
address lines
analog/digital serial
data input
control line
signal line
control line
attenuation
attenuate DAC
auxiliary channel
output
auxiliary envelope
azimuth check
control line
control line
control line
control line
control line
channel n
control line
15
8 address lines to DRAM to locate an address for writing
data into or reading data from memory.
DAI input for serial data from AD convertor (see also S-
DATA).
Serial data output source selection
Analog signal left (right) channel playback analog compact
cassette.
Audio sample length selection
Data input for DAC to set his attenuation register.
Control line (output from SBG) connected to DAC
attenuation input.
Sliced output from DEQ of auxiliary channel data (bit rate
12 kb/s) routed to DDSP input TAUX.
_ Digital representation of the AUX signal and monitors
during DCC search mode the start of a track.
Monitors the azimuth of channels 0 and 7 (output of
DDSP).
Bias current for internal AID converter of DEQ2
Bias current for internal AID converter of DEQ2
Via connection points A and B of capstan motor the
reference of the integrated speed control is controlled by
the additional external speed control.
Low output level switches the capstan motor on.
Column address strobe for DRAM
DEQ channel n output to DDSP inputs TCHO..TCH7.
Indication if a chrome analog cassette is inserted. Chrome
Cassette is high level.
CS45915

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70dcc600/00870dcc600/05870dcc600/068