Pin Descriptions; Fdc37C67 Pin Descriptions - Acer 390 Series Service Manual

2.3.4

Pin Descriptions

Table 2-6

FDC37C67 Pin Descriptions

Pin No./QFP
Processor / Host Interface (34)
E37:40, 42:45 System Data Bus
20:30 11-bit System Address Bus
31 Chip select/SA11 (Note 1)
36 Address Enable
55 I/O Channel Ready
46 ISA Reset Drive
33 Serial IRQ/Parallel IRQ_3
32 PCI Clock for Serial IRQ (33
MHz/30MHz)/Parallel IRQ_4
50 DMA Request 1
48 DMA Request 2
52 DMA Request 3/8042 P12
47 DMA Acknowledge 1
49 DMA Acknowledge 2
51 DMA Acknowledge 3/8042 P16
54 Terminal Count
34 I/O Read
35 I/O Write
Clocks(1)
19 14.318MHz Clock Input
Infrared Interface (2)
61 Infrared Rx
62 Infrared Tx
Power Pins (8)
18,53,65,93 Power
7,41,60, 76 Ground
FDD Interface (16)
16 Read Disk Data
11 Write Gate
10 Write Disk Data
12 Head Select
8 Step Direction
9 Step Pulse
17 D3k _ha_
5 Dr we 58SM O
4 Drive Select 1
2-52
Pin Name Type Symbol
8 SD[0:7]
11 SA[0:10]
1 nCS/SA11
1 AEN
1 IOCHRDY
1 RESET_DRV
1 SER_IRQ/IRQ3
1 PCI_CLK/IRQ4
1 DRQ1
1 DRQ2
1 DRQ3/P12
1 nDACK1
1 nDACK2
1 nDACK3/P16
1 TC
1 nIOR
1 nIOW
1 CLOCKI
1 IRRX
1 IRTX
VCC
VSS
1 nRDATA
1 nWGATE
1 nWDATA
1 nHDSEL
1 nDIR
1 nSTEP
1 nDSKCHG
1 nDS0
1 nDS1
Buffer Type
IO24
I
I
I
OD24
IS
IO24/O24/D24(Note
0)
IO24/O24/D24(Note
0)
O24
O24
O24/IO24
I
I
I/IO24
I
I
I
ICLK
1
O24
IS
O224/OD24
O224/OD24
O224/OD24
O224/OD24
O224/OD24
IS
O224/OD24
O224/OD24
Service Guide