EIDE Hard Drive / CD-ROM Interfaces
VSBC-8 Reference Manual
Reference
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25
EIDE Hard Drive / CD-ROM Interfaces
Two EIDE interfaces are available to connect up to four hard disk or CD-ROM drives.
Connector J18 is the primary IDE controller with a 40-pin .1” connector and connector J19 is the
secondary IDE controller with a 40-pin .1” connector. Use CMOS Setup to specify the drive
parameters of the attached drives.
Some older IDE drives, such as those that are PIO Mode 0-1, do not operate reliably with this
product. VersaLogic recommends the use of only PIO Mode 2-3 and Ultra DMA type drives
with this product.
Warning!
Cable length must be 18" or less to maintain proper signal integrity. The grounds
in this connector should not be used to carry motor current.
Table 8: EIDE Hard Drive Connector Pinout
J18, J19
Pin
Signal
Name
EIDE
Signal Name
Function
1
HRST*
Host Reset
Reset signal from CPU
2
Ground
Ground
Ground
3
IDE7
DATA 7
Data bit 7
4
HD8
DATA 8
Data bit 8
5
HD6
DATA 6
Data bit 6
6
HD9
DATA 9
Data bit 9
7
HD5
DATA 5
Data bit 5
8
HD10
DATA 10
Data bit 10
9
HD4
DATA 4
Data bit 4
10
HD11
DATA 11
Data bit 11
11
HD3
DATA 3
Data bit 3
12
HD12
DATA 12
Data bit 12
13
HD2
DATA 2
Data bit 2
14
HD13
DATA 13
Data bit 13
15
HD1
DATA 1
Data bit 1
16
HD14
DATA 14
Data bit 14
17
HD0
DATA 0
Data bit 0
18
HD15
DATA 15
Data bit 15
19
Ground
Ground
Ground
20
NC
NC
No connection
21
NC
NC
No connection
22
Ground
Ground
Ground
23
HWR*
HOST IOW*
I/O write
24
Ground
Ground
Ground
25
HRD*
HOST IOR*
I/O read
26
Ground
Ground
Ground
27
NC
NC
No connection
28
HAEN
ALE
Address latch enable
29
NC
NC
No connection
30
Ground
Ground
Ground
31
HINT
HOST IRQ14
IRQ14
32
XI16*
HOST IOCS16*
Drive register enabled
33
HA1
HOST ADDR1
Address bit 1
34
NC
NC
No connection
35
HA0
HOST ADDR0
Address bit 0
36
HA2
HOST ADDR2
Address bit 2
37
HCS0*
HOST CS0*
Reg. access chip select 0
38
HCS1*
HOST CS1*
Reg. access chip select 1
39
NC
NC
No connection
40
Ground
Ground
Ground
