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5-1. SYSTEM CONTROL PIN FUNCTION (MB-85 BOARD IC202)
Pin No.
Pin name
I/O
Function
1
PB5
O
Analog filter gain control
2
PB6
O
VES gain control "H": VES
3
PB7
O
Rear CH boost control "H": rear boost
4
VCC3
-
Power supply
5
CLK
O
CPU clock out (25 MHz)
6
CS5
O
Not used
7
CS4
O
Chip select signal for ARP, SERVO DSP and HGA
8
CS3
O
Chip select signal for SDRAM and AV DEC
9
CS2
O
Chip select signal for REG and AV DEC
10
CS1
O
Chip select signal for external SRAM
11
CS0
O
Chip select signal for external FLASH ROM
12
NMI
I
Not used (fixed at "H")
13
HST
I
Not used (fixed at "H")
14
RST
I
Reset signal input from IF CON
15
GND
-
Ground
16
MD0
I
Input of mode select 0 (fixed at "1")
17
MD1
I
Input of mode select 1 (fixed at "0")
18
MD2
I
Input of mode select 2 (fixed at "0")
19
RDY
I
Wait signal input
20
P81
I
Test terminal (fixed at "H")
21
P82
I
Test terminal (fixed at "L")
22
RD
O
Read enable signal output
23
WR0
O
High byte write enable signal output (16 bit and 8 bit)
24
WR1
O
Low byte write enable signal output (16 bit only)
25-32
D16-D23
I/O
Data bus D0-D7 (16 bit)
33-39
D24-D30
I/O
Data bus D8-D14 (16 bit), D0-D6 (8 bit)
40
GND
-
Ground
41
D31
I/O
Data bus D15 (16 bit), D7 (8 bit)
42
A00
O
Address bus A0
43
VCC5
-
Power supply
44-64
A01-A21
O
Address bus A1-A21
65
GND
-
Ground
66
P66
O
PLL IC control output "H": DOUBLE
67
P67
I
DIAG mode signal input "L": DIAG
Pin No.
Pin name
I/O
Function
68
EOP0
I
Not used
69
AVCC
-
Power supply
70
AVRH
-
Reference power supply (+3.3V)
71
AGND
-
Ground
72
AN0
I
Set of mode 0
73
AN1
I
Set of mode 1
74
AN2
I
Set of mode 2
75
AN3
I
Set of mode 3 (fixed at "H")
76
SI0
I
Serial data input from IF CON and EEPROM
77
SO0
O
Serial data output to IF CON and EEPROM
78
SC0
O
Serial clock output to IF CON and EEPROM
79
SI1
I
Serial bus 1 (for data input)
80
SO1
O
Serial bus 1 (for data output)
81
SI2
I
Serial bus 2 (for data input)
82
SO2
O
Serial bus 2 (for data output)
83
PF7
O
Reset signal output
84
DACK1
O
Output of DMA-ACK 0 to AV DEC
85
DACK0
O
Output of DMA-ACK 1 to AV DEC
86
DREQ1
I
Input of DMA-REQ 0 from AV DEC
87
DREQ0
I
Input of DMA-REQ 1 from AV DEC
88
INT3
I
Input of interrupt from HGA
89
SC1
O
Serial clock output
90
GND
-
Ground
91
X1
O
Clock output (12.5MHz)
92
X0
I
Clock input (12.5MHz)
93
VCC5
-
Power supply
94
INT1
I
Input of interrupt ARP and SERVO DSP
95
INT0
I
Input of interrupt from AV DEC
96
PB0
I
Rear panel lime input select ("H": DISC "L": EXT)
97
PB1
O
Chip select signal to IF CON
98
PB2
O
Chip select signal to DAC (Lt and Rt)
99
PB3
O
Chip select signal to DAC (L and R)
100
PB4
O
DVD/CD select ("H": 44.1kHz "L": 48kHz)
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