05 HD06 I/O 06 HD09 I/O
07 HD05 I/O 08 HD10 I/O
09 HD04 I/O 10 HD11 I/O
11 HD03 I/O 12 HD12 I/O
13 HD02 I/O 14 HD13 I/O
15 HD01 I/O 16 HD14 I/O
17 HD00 I/O 18 HD15 I/0
19 GND (20) Key
21 (Resv) 22 GND
23 -HIOW I 24 GND
25 -HIOR I 26 GND
27 IORDY O 28 (Resv)
29 (Resv) 30 GND
31 HIRQ O 32 -HIOCS16 O
33 HA01 I 34 -PDIAG I/O
35 HA00 I 36 HA02 I
37 -HCSO I 38 -HCS1 I
39 -DASP I/O 40 GND
Note:
"O" designates an output from the Drive. "I" designates an input to the Drive.
"I/O" designates an input/output common.
"PWR" designates a power supply to the Drive.
"(Resv)" designates reserved pins and all of these have to be left unconnected.
Cabling
The maximum cable length from the Host system to the drive, plus the circuit pattern length inside
the Host systems, must not exceed 18 inches (45.7cm).
Interface
This data sheet describes some aspects of the host interface to ATA drives. The interface
conforms to the CAM draft proposal for an AT attachment with certain limitations described
below.
Automatic Power-Down Sequence
A hard reset will disable the automatic power-down sequence.
Format Track Alternate Sectors
The Drive does not support alternate sector locations and will ignore any descriptors whose
values are 20h (Unassign Alternate Sector) or 40h (Assign Alternate Sector), without returning an
error.
Format Track Interleave Factor