Sony MDS-EX77 Service Manual page 55

BD BOARD IC121
(DIGITAL SIGNAL PROCESSOR,
SHOCK PROOF MEMORY CONTROLLER,
Pin No. Pin Name I / O
1 FOK O
2 SHCK O
3 XBUSY O
4 SLOC O
5 SWDT I
6 SCLK I
7 XLAT I
8 SRDT O (3)
9 SENS O (3)
10 XRST I
11 SQSY O
12 DQSY O
13 RECP I
14 XINT O
15 TX I
16 OSCI I
17 OSCO O
18 XTSL I
19 RVDD —
20 RVSS —
21 DIN I
22 DOUT O
23 ADDT I
24 DADT O
25 LRCK O
26 XBCK O
27 FS256 O
28 DVDD —
29 A03 O
30 A02 O
31 A01 O
32 A00 O
33 A10 O
34 A04 O
35 A05 O
36 A06 O
37 A07 O
38 A08 O
39 A11 O
CXD2650R
DIGITAL SERVO PROCESSOR, EFM/ACIRC ENCODER/DECODER,
ATRAC ENCODER/DECODER, 2M BIT D-RAM)
Focus OK signal output to the system controller (IC401)
Track jump detection signal output to the system controller (IC401)
Monitor 2 signal output to the system controller (IC401)
Monitor 3 signal output to the system controller (IC401)
Writing data signal input from the system controller (IC401)
Serial clock signal input from the system controller (IC401)
Serial latch signal input from the system controller (IC401)
Reading data signal output to the system controller (IC401)
Internal status (SENSE) output to the system controller (IC401)
Reset signal input from the system controller (IC401)
Subcode Q sync (SCOR) output to the system controller (IC401)
"L" is output every 13.3 msec
Digital In U-bit CD format subcode Q sync (SCOR) output to the system controller (IC401)
"L" is output every 13.3 msec
Laser power selection signal input from the system controller (IC401)
"H": recording mode, "L": playback mode
Interrupt status output to the system controller (IC401)
Recording data output enable signal input from the system controller (IC401)
Writing data transmission timing input (Also serves as the magnetic head on/off output)
System clock signal (512Fs=22.5792 MHz) input from the A/D, D/A converter (IC201)
System clock signal (512Fs=22.5792 MHz) output terminal
Input terminal for the system clock frequency setting
"L": 45.1584 MHz, "H": 22.5792 MHz (fixed at "H" in this set)
Power supply terminal (+3.3V) (digital system)
Ground terminal (digital system)
Digital audio signal input terminal when recording mode (for optical in)
Digital audio signal output terminal when playback mode (for optical out)
Recording data input from the A/D, D/A converter (IC201)
Playback data output to the A/D, D/A converter (IC201)
L/R sampling clock signal (44.1 kHz) output to the A/D, D/A converter (IC201)
Bit clock signal (2.8224 MHz) output to the A/D, D/A converter (IC201)
Clock signal (11.2896 MHz) output terminal
Power supply terminal (+3.3V) (digital system)
Address signal output to the external D-RAM
Function
Almost all, "H" is output
Almost all, "H" is output
Not used (open)
Not used (open)
– 60 –
"H" is output when focus is on
"L": reset
Not used (open)
Not used