SQ578
3-14
Pin
Signal Name
Pin
Signal Name
1
Reset IDE
2
Ground
3
Host Data 7
4
Host Data 8
5
Host Data 6
6
Host Data 9
7
Host Data 5
8
Host Data 10
9
Host Data 4
10
Host Data 11
11
Host Data 3
12
Host Data 12
13
Host Data 2
14
Host Data 13
15
Host Data 1
16
Host Data 14
17
Host Data 0
18
Host Data 15
19
Ground
20
Key
21
DDRQ0 (DDRQ1)
22
Ground
23
I/O Write #
24
Ground
25
I/O Read #
26
Ground
27
IOCHRD
28
+5V V pull-up
29
DDACK0 (DDACK1) #
30
Ground
31
IRQ14 (IRQ15)
32
Reserved
33
Addr 1
34
Reserved
35
Addr 0
36
Addr 2
37
Chip Select 1P (1S) #
38
Chip Select 3P (3S)
39
Activity #
40
Ground
WARNING:
When you connect a ribbon cable to these ports, you must orient the cable
connector so that the PIN 1 edge of the cable is at the PIN 1 end of the on-board connector.
3.5.2
Secondary IDE Connector (40-pin block) (J26)
This connector supports two secondary channel IDE devices or 120MB Floppy drive(LS-
120) via a ribbon cable. When two IDE devices are installed using the secondary IDE
connector make sure that the second IDE device is adjusted to slave mode as instructed in
the device’s manual.
Pin
Signal Name
Pin
Signal Name
1
Reset IDE
2
Ground
3
Host Data 7
4
Host Data 8
5
Host Data 6
6
Host Data 9
7
Host Data 5
8
Host Data 10
9
Host Data 4
10
Host Data 11
11
Host Data 3
12
Host Data 12
13
Host Data 2
14
Host Data 13
15
Host Data 1
16
Host Data 14
17
Host Data 0
18
Host Data 15
19
Ground
20
Key
21
DDRQ0 (DDRQ1)
22
Ground
23
I/O Write #
24
Ground
25
I/O Read #
26
Ground
27
IOCHRD
28
+5V V pull-up
29
DDACK0 (DDACK1) #
30
Ground
31
IRQ14 (IRQ15)
32
Reserved
33
Addr 1
34
Reserved
35
Addr 0
36
Addr 2
37
Chip Select 1P (1S) #
38
Chip Select 3P (3S)
39
Activity #
40
Ground
WARNING:
When you connect a ribbon cable to these ports, you must orient the cable
connector so that the PIN 1 edge of the cable is at the PIN 1 end of the on-board connector.
3.5.3
Floppy Drive Connector (34-pin block) (J21)
The FDC sub-system can control three types (1.2, 1.44, and 2.88MB) of floppy drivers or
compatible tape drives. Connection to floppy drives is via a header (J21). The floppy disk
interface includes 48mA drivers and Schmit inputs on the drive interface.
Summary of Contents for SQ578
Page 1: ...SQ578 Pentium PCI Mainboard User s Manual...
Page 4: ......
Page 28: ......
Page 48: ...SQ578 4 20 IRQ10 IRQ11 IRQ12 IRQ14 IRQ15...
Page 57: ...SQ578 Documentation Rev Number A02 September 1997...
