saa7327 NXP Semiconductors, saa7327 Datasheet - Page 13

• Manufacturer Part Number: saa7327
• Description: Digital Servo Processor And Compact Disc Decoder With Integrated Dac For Video Cd Cd7 Ii
• Manufacturer: NXP Semiconductors

Philips Semiconductors
7.5
7.5.1
The 96-bit Q-channel word is accumulated in an internal
buffer. The last 16 bits are used internally to perform a
Cyclic Redundancy Check (CRC). If the data is good, the
SUBQREADY-I signal will go LOW. SUBQREADY-I can
be read via the SDA or STATUS pins, selected via decoder
register 2. Good Q-channel data may be read from SDA.
7.5.2
Data from all the subcode channels (P-to-W) may be read
via the subcode interface, which conforms to EIAJ
CP-2401. The interface is enabled and configured as
either a 3 or 4-wire interface via decoder register F.
2000 Jun 26
handbook, full pagewidth
Digital servo processor and Compact Disc
decoder with integrated DAC for video CD (CD7 II)
Subcode data processing
Q-
EIAJ 3
INTERFACES
SBSY
SFSY
RCK
SUB
SFSY
RCK
SUB
CHANNEL PROCESSING
AND
4-
WIRE SUBCODE
SF0
SF0
Fig.8 EIAJ subcode (CD graphics) interface format.
SFSY
RCK
SUB
SF1
SF1
(CD
GRAPHICS
P
P-W
EIAJ 4-wire subcode interface
P-W
EIAJ 3-wire subcode interface
SF2
SF2
Q
)
R
S
13
P-W
P-W
SF3
SF3
The subcode interface output formats are illustrated in
Fig.8, where the RCK signal is supplied by another device
such as a CD graphics decoder.
7.5.3
Data of subcode channels, Q-to-W, may be read via pin V4
if selected via decoder register D. The format is similar to
RS232 and is illustrated in Fig.9. The subcode sync word
is formed by a pause of (200/n) s minimum. Each
subcode byte starts with a logic 1 followed by 7 bits
(Q-to-W). The gap between bytes is variable between
(11.3/n) s and (90/n) s.
The subcode data is also available in the EBU output
(DOBM) in a similar format.
T
U
V
V4
W
SUBCODE INTERFACE
SF97
SF97
P-W
P-W
SF0
SF0
Product specification
SF1
SF1
SAA7327
MBG410