IBM IC25N020ATDA04 - Travelstar 20 GB Hard Drive - Signal Definitions; Figure 38. Table of Signals

7.3 Signal definitions
The pin assignments of interface signals are listed as follows:
(reserved)
44
GND
43
power
+ 5V motor
42
power
+ 5V logic
41
GND
40
OD
I/O
DASP-
39
TTL
I
CS1-
38
TTL
I
CS0-
37
TTL
I
DA02
36
TTL
I
DA00
35
OD
I/O
PDIAG-
34
TTL
I
DA01
33
OD
O
IOCS16(*)-
32
3–state
O
INTRQ
31
GND
30
TTL
I
DMACK-
29
TTL
I
CSEL
28
3–state
O
IORDY(*)
27
GND
26
TTL
I
DIOR(*)-
25
GND
24
TTL
I
DIOW(*)-
23
GND
22
3–state
O
DMARQ
21
Key
(20)
GND
19
3–state
I/O
DD15
18
3–state
I/O
DD00
17
3–state
I/O
DD14
16
3–state
I/O
DD01
15
3–state
I/O
DD13
14
3–state
I/O
DD02
13
3–state
I/O
DD12
12
3–state
I/O
DD03
11
3–state
I/O
DD11
10
3–state
I/O
DD04
09
3–state
I/O
DD10
08
3–state
I/O
DD05
07
3–state
I/O
DD09
06
3–state
I/O
DD06
05
3–state
I/O
DD08
04
3–state
I/O
DD07
03
GND
02
TTL
I
RESET-
01
Type
I/O
SIGNAL
PIN
Type
I/O
SIGNAL
PIN
Figure 38. Table of signals
Notes:
"O" designates an output from the Drive.
"I" designates an input to the Drive.
"I/O" designates an input/output common.
"OD" designates an Open-Drain output.
The signal lines marked with (*) are redefined during the Ultra DMA protocol to provide special
functions. These lines change from the conventional to special definitions at the moment the Host
decides to allow a DMA burst, if the Ultra DMA transfer mode was previously chosen via SetFeatures.
The drive becomes aware of this change upon assertion of the DMACK- line. These lines revert back
to their original definitions upon the deassertion of DMACK- at the termination of the DMA burst.
"power" designates a power supply to the drive.
"reserved" designates reserved pins which must be left unconnected.
Travelstar 48GH, 30GN & 15GN hard disk drive specifications
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