83
7-22. IC PIN FUNCTIONS
• IC301 CD-ROM DECODER AND SCSI INTERFACE (CXD1818R) (MA-C30 board)
VSS
VDD
XDB0
VSS
XDB1
VSS
VDD
XDB2
VSS
XDB3
XDB4
VSS
VSS
VDD
XDB5
VSS
XDB6
VSS
XDB7
VSS
VDD
XDBP
VSS
XATN
VSS
XBSY
VSS
VDD
XACK
XSRS
VSS
VSS
VDD
VSS
XMSG
XSEL
VSS
VDD
XCD
VSS
XREQ
VSS
XIO
XCM1
AC
AVSS
AVDD
XTL2
XTL1
CLK
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
–
–
I/O
–
I/O
–
–
I/O
–
I/O
/O
–
–
–
I/O
–
I/O
–
I/O
–
–
I/O
–
I/O
–
I/O
–
–
I/O
I/O
–
–
–
–
I/O
I/O
–
–
I/O
–
I/O
–
I/O
O
I
–
–
O
I
O
Ground
Power supply (+5V)
SCSI data bus bit0
Ground
SCSI data bus bit1
Ground
Power supply (+5V)
SCSI data bua bit2
Ground
SCSI data bus bit3
SCSI data bus bit4
Ground
Ground
Power supply (+5V)
SCSI data bus bit5
Ground
SCSI data bus bit6
Ground
SCSI data bus bit7
Ground
Power supply (+5V)
SCSI data bus parity
Ground
SCSI control bus/ATN signal
Ground
SCSI control bus/BSY signal
Ground
Power supply (+5V)
SCSI control bus/ACK signal
SCSI control bus/RST signal
Ground
Ground
Power supply (+5V)
Ground
SCSI control bus/MSG signal
SCSI control bus/SEL signal
Ground
Power supply (+5V)
SCSI control bus/CD signal
Ground
SCSI control bus/REQ signal
Ground
SCSI control bus/IO signal
VCO charge pump output for multiplying
VCO control voltage input for multiplying
Analog ground
Analog power supply (+5V)
Output of crystal oscillating circuit
Input of crystal oscillating circuit
Clock output
Pin No.
Pin Name
I/O
Function