Acer 390 Series, Service Manual

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2-52 Service Guide
2.3.4 Pin Descriptions
Table 2-6 FDC37C67 Pin Descriptions
Pin No./QFP Pin Name Type Symbol Buffer Type
Processor / Host Interface (34)
E37:40, 42:45 System Data Bus 8 SD[0:7] IO24
20:30 11-bit System Address Bus 11 SA[0:10] I
31 Chip select/SA11 (Note 1) 1 nCS/SA11 I
36 Address Enable 1 AEN I
55 I/O Channel Ready 1 IOCHRDY OD24
46 ISA Reset Drive 1 RESET_DRV IS
33 Serial IRQ/Parallel IRQ_3 1 SER_IRQ/IRQ3 IO24/O24/D24(Note
0)
32 PCI Clock for Serial IRQ (33
MHz/30MHz)/Parallel IRQ_4 1 PCI_CLK/IRQ4 IO24/O24/D24(Note
0)
50 DMA Request 1 1 DRQ1 O24
48 DMA Request 2 1 DRQ2 O24
52 DMA Request 3/8042 P12 1 DRQ3/P12 O24/IO24
47 DMA Acknowledge 1 1 nDACK1 I
49 DMA Acknowledge 2 1 nDACK2 I
51 DMA Acknowledge 3/8042 P16 1 nDACK3/P16 I/IO24
54 Terminal Count 1 TC I
34 I/O Read 1 nIOR I
35 I/O Write 1 nIOW I
Clocks(1)
19 14.318MHz Clock Input 1 CLOCKI ICLK
Infrared Interface (2)
61 Infrared Rx 1 IRRX 1
62 Infrared Tx 1 IRTX O24
Power Pins (8)
18,53,65,93 Power VCC
7,41,60, 76 Ground VSS
FDD Interface (16)
16 Read Disk Data 1 nRDATA IS
11 Write Gate 1 nWGATE O224/OD24
10 Write Disk Data 1 nWDATA O224/OD24
12 Head Select 1 nHDSEL O224/OD24
8 Step Direction 1 nDIR O224/OD24
9 Step Pulse 1 nSTEP O224/OD24
17 D3k _ha_ 1 nDSKCHG IS
5 Dr we 58SM O 1 nDS0 O224/OD24
4 Drive Select 1 1 nDS1 O224/OD24