Interfaces and Connectors
EPM-15 Reference Manual
28
IDE Hard Drive / CD-ROM Interfaces
The IDE interface is available to connect up to two IDE devices, such as hard disks, CD-ROM
drives, or CompactFlash. Connector J7 is the primary IDE controller with a 44-pin 2 mm latching
connector. Use CMOS setup to specify the drive parameters of the drive. If you use the on-board
CompactFlash device, only one other IDE device can be connected to the IDE controller.
Cable length must be 18" or less to maintain proper signal integrity.
This interface supplies power to 2.5" IDE drives. If you are connecting a 3.5" drive to the
interface (using the CBR-4405 44-pin to 40-pin IDE adapter), you must supply external power to
the drive. The power cable attached to a 3.5" drive must be properly grounded so that motor
current is not returned via the grounds in the data cable.
Table 5: J7 IDE Hard Drive Connector Pinout
Pin Signal Name
Function
Pin Signal Name
Function
1
Reset-
Reset signal from CPU
23
DIOW
I/O write
2 Ground
Ground
24 Ground
Ground
3
DD7
Data bus bit 7
25
DIOR
I/O read
4
DD8
Data bus bit 8
26
Ground
Ground
5
DD6
Data bus bit 6
27
IORDY
I/O ready
6
DD9
Data bus bit 9
28
CSEL
Cable select
7
DD5
Data bus bit 5
29
DMACK-
DMA acknowledge
8
DD10
Data bus bit 10
30
Ground
Ground
9
DD4
Data bus bit 4
31
INTRQ
Interrupt request
10
DD11
Data bus bit 11
32
NC
No connection
11
DD3
Data bus bit 3
33
DA1
Device address bit 1
12
DD12
Data bus bit 12
34
CBLID-
Cable type identifier
13
DD2
Data bus bit 2
35
DA0
Device address bit 0
14
DD13
Data bus bit 13
36
DA2
Device address bit 2
15
DD1
Data bus bit 1
37
CS0
Chip select 0
16
DD14
Data bus bit 14
38
CS1
Chip select 1
17
DD0
Data bus bit 0
39
DASP-
LED
18
DD15
Data bus bit 15
40
Ground
Ground
19 Ground
Ground
41 Power
+5.0
V
20 NC
Key
42 Power
+5.0
V
21 PDMARQ
DMA
request
43 Ground
Ground
22 Ground
Ground
44 NC
No
connection
