VersaLogic Cheetah EPM-32, Reference Manual, Page: 32 / 57

EPM-32 Reference Manual
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Interfaces and Connectors
IDE Hard Drive / CD-ROM Interface
One IDE interface is available to connect up to two IDE devices, such as hard disks or CD-ROM
drives. Connector JS4 is the IDE controller with a 44-pin connector. Use CMOS Setup to specify
the drive parameters of the attached drives.
Note: The two devices connected to this interface are identified as IDE 0 and IDE 1 in
CMOS Setup. The CompactFlash device operates on a different IDE channel and
is identified as IDE 2. IDE 3 is not used in the EPM-32.
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.
Table 4: JS4 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 CS1 Chip select 1
16 DD14 Data bus bit 14 38 CS3 Chip select 3
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
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