Yamaha A5000 - Page 13

A5000/A4000
13
(IC9)
(IC8)
SED1335F0B (XQ595A00) LCDC (LCD Controller)
PIN
NO.
NAME I/O
FUNCTION
PIN
NO.
NAME I/O
FUNCTION
1
VA5 O
31
XD2 O
2
VA4 O
32
XD1 O
X driver data bus
3
VA3 O
VRAM address bus 33
XD0 O
4
VA2 O
34
XECL O
X driver enable chain clock
5
VA1 O
35
XSCL O
X driver shift clock
6
VA0 O
36
VSS -
Ground
7
VR/W O
VRAM write strobe 37
LP O
Latch pulse
8
/VCE O
VRAM chip enable 38
WF O
Frame signal
9
NC -
39
YDIS O
LCD power down
10
/RES I
Reset 40
YD O
Scan start pulse
11
NC -
41
YSCL O
Scan shift clock
12
NC -
42
VD7 I/O
13
/RD I
80: Read strobe, 68: E clock 43
VD6 I/O
14
/WR I
80: Write strobe, 68: Read/Write
44
VD5 I/O
15
SEL2 I
CPU 80/68 bus select 45
VD4 I/O
VRAM data bus
16
SEL1 I
46
VD3 I/O
17
OSC1 I
Clock 47
VD2 I/O
18
OSC2 O
48
VD1 I/O
19
/CS I
Chip select 49
VD0 I/O
20
A0 I
Data bus signal discrimination 50
VA15 O
21
VDD -
Power supply 51
VA14 O
22
D0 I/O
52
VA13 O
23
D1 I/O
53
VA12 O
24
D2 I/O
54
VA11 O
VRAM address bus
25
D3 I/O
55
VA10 O
26
D4 I/O
Data bus 56
VA9 O
27
D5 I/O
57
VA8 O
28
D6 I/O
58
VA7 O
29
D7 I/O
59
VA6 O
30
XD3 O
X driver data bus 60
NC -
HD63266F (XI939A00) FDC (Floppy Disk Controller)
PIN
NO.
NAME I/O
FUNCTION
PIN
NO.
NAME I/O
FUNCTION
1
8"//5" I
Data transmission speed 33
/TRKO I
Track 00 signal
2
XTALSET I
Clock select 34
/INDEX I
Index signal
3
/RESET I
Rest 35
/RDATA I
Read data input from FDD
4
E//RD I
Enable/Read 36
XTAL2
Clock
5
RW//WR I
Read/write/Write 37
EXTAL2
6
/CS I
Chip select 38
NC -
7
/DACK I
DMA acknowledge 39
XTAL1
Clock
8
RS0 I
Register select 40
EXTAL1
9
RS1 I
41
VSS4 -
Ground
10
VSS1 -
Ground 42
VSS5 -
11
VSS2 -
43
NC -
12
D0 I/O
44
VCC2 -
13
D1 I/O
45
VCC3 -
Power supply
14
D2 I/O
46
VCC4 -
15
D3 I/O
Data bus 47
/WGATE O
Write control
16
D4 I/O
48
/WDATA O
Write data to FDD
17
D5 I/O
49
VSS6 -
Ground
18
D6 I/O
50
/STEP O
Step signal to control head of FDD
19
D7 I/O
51
/HDIR O
Direction
20
/DREQ O
DMA request 52
/HLOAD O
Head load
21
/IRQ O
Interrupt request 53
/HSEL O
Head select
22
/DEND I
Data end 54
VSS7 -
Ground
23
VSS3 -
Ground 55
/DS0 O
24
1/2 EX1
56
/DS1 O
Drive select
25
VCC1 -
Power supply 57
/DS2 O
26
NUM1 I
58
/DS3 O
27
NUM3 I
59
VSS8 -
Ground
28
IFS I
Host interface select 60
/MON0 O
29
SFORM I
Format data 61
/MON1 O
Motor on
30
/INP I
Index pulse 62
/MON2 O
31
/READY I
Ready from FDD 63
/MON3 O
32
/WPRT I
Write control signal 64
VSS9 -
Ground