Deskstar 7K250 Hard Disk Drive Specification
44
7.2 Signal definitions
The pin assignments of interface signals are listed as follows:
Notes
:
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 Set Features. 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.
Table 32: Signal definitions
PIN
SIGNAL
I/O
Type
PIN
SIGNAL
I/O
Type
01
RESET-
I
TTL
02
GND
03
DD7
I/O
3–state
04
DD08
I/O
3–state
05
DD6
I/O
3–state
06
DD09
I/O
3–state
07
DD5
I/O
3–state
08
DD10
I/O
3–state
09
DD4
I/O
3–state
10
DD11
I/O
3–state
11
DD3
I/O
3–state
12
DD12
I/O
3–state
13
DD2
I/O
3–state
14
DD13
I/O
3–state
15
DD1
I/O
3–state
16
DD14
I/O
3–state
17
DD0
I/O
3–state
18
DD15
I/O
3–state
19
GND
(20)
Key
21
DMARQ
O
3–state
22
GND
23
DIOW-(*)
I
TTL
24
GND
25
DIOR-(*)
I
TTL
26
GND
27
IORDY-(*)
O
3–state
28
CSEL
I
TTL
29
DMACK-
I
TTL
30
GND
31
INTRQ
O
3–state
32
33
DA1
I
TTL
34
PDIAG-
I/O
OD
35
DA0
I
TTL
36
DA02
I
TTL
37
CS0-
I
TTL
38
CS1-
I
TTL
39
DASP-
I/O
OD
40
GND
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
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