9.1.2 Signal definition
The pin assignments of interface signals are listed in the figure below:
–
–
GND
40
OC
I/O
DASP-
39
TTL
I
CS1-
38
TTL
I
CSO-
37
TTL
I
DA2
36
TTL
I
DA0
35
OC
I/O
PDIAG-
34
TTL
I
DA1
33
OC
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
DD0
17
3-state
I/O
DD14
16
3-state
I/O
DD1
15
3-state
I/O
DD13
14
3-state
I/O
DD2
13
3-state
I/O
DD12
12
3-state
I/O
DD3
11
3-state
I/O
DD11
10
3-state
I/O
DD4
09
3-state
I/O
DD10
08
3-state
I/O
DD5
07
3-state
I/O
DD9
06
3-state
I/O
DD6
05
3-state
I/O
DD8
04
3-state
I/O
DD7
03
–
–
GND
02
TTL
I
RESET-
01
Type
I/O
SIGNAL
PIN
Type
I/O
SIGNAL
PIN
Notes:
1. "O" designates an output from the drive.
2. "I" designates an input to the drive.
3. "I/O" designates an input/output common.
4. "OC" designates open-collector or open-drain output.
5. 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.
6. (**) complies with ATA-2.
Figure 21. Table of signal definitions
DIOR-
IORDY
DIOW-
HDMARDY-
DSTROBE
STOP
Read Operation
IORDY
DIOR-
DIOW-
DDMARDY-
HSTROBE
STOP
Write Operation
Conventional Definition
Special Definition
(for Ultra DMA)
Figure 22. Special signal definitions for Ultra DMA
Deskstar 60 GXP Hard disk drive specification
26
Содержание IC35L020 - Deskstar 20 GB Hard Drive
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