Deskstar 25GP and 22GXP
Electrical interface specifications
Deskstar 25GP models: DJNA-352500, 352030, 351520, 351010
Deskstar 22GXP models: DJNA-372200, 371800, 371350, 370910
Connectors
The DC power
connector is designed to mate with AMP part 1-480424 (using AMP pins
P/N 350078-4). Equivalent connectors may be used. Pin assignments
are shown below, viewed from the end of the drive.
A/T (IDE) interface connector
The drive uses
single-ended drivers and receivers. The connector is designed to
mate with 3M part 3417-7000 or equivalent.
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 (45.7 cm). For systems operating
with Ultra DMA mode 3 or 4, the 80-conductor ATA cable assembly (SFF-8049) should be used.
Pin assignments
| Pin |
Signal |
I/O |
Pin |
Signal |
I/O |
| 01 |
-RESET |
I |
02 |
GND |
| 03 |
DD07 |
I/O |
04 |
DD08 |
I/O |
| 05 |
DD06 |
I/O |
06 |
DD09 |
I/O |
| 07 |
DD05 |
I/O |
08 |
DD10 |
I/O |
| 09 |
DD04 |
I/O |
10 |
DD11 |
I/O |
| 11 |
DD03 |
I/O |
12 |
DD12 |
I/O |
| 13 |
DD02 |
I/O |
14 |
DD13 |
I/O |
| 15 |
DD01 |
I/O |
16 |
DD14 |
I/O |
| 17 |
DD00 |
I/O |
18 |
DD15 |
I/O |
| 19 |
GND |
(20) |
KEY |
| 21 |
DMARQ |
O |
22 |
GND |
| 23 |
-DIOW* |
I |
24 |
GND |
| 25 |
-DIOR* |
I |
26 |
GND |
| 27 |
IORDY* |
O |
28 |
CSEL |
I |
| 29 |
-DMACK |
I |
30 |
GND |
| 31 |
INTRQ |
O |
32 |
-HIOCS16 |
O |
| 33 |
DA01 |
I |
34 |
-PDIAG/-CBLID |
I/O |
| 35 |
DA00 |
I |
36 |
DA02 |
I |
| 37 |
-CSO |
I |
38 |
-CS1 |
I |
| 39 |
-DASP |
I/O |
40 |
GND |
|
Notes:
- "O" designates an output from the drive.
- "I" designates an input from the drive.
- "I/O" designates an input/output common.
- The signal lines marked with (*) are redifined during the
Ultra DMA protocol to provide special functions as detailed
in the table below.
|
| Operation |
Ultra DMA |
Conventional definition |
| Write Operation |
-DDMARDY |
IORDY |
| HSTROBE |
-DIOR |
| STOP |
-DIOW |
| Read Operation |
-HDMARDY |
-DIOR |
| DSTROBE |
IORDY |
| STOP |
-DIOW |
|
