Datasheet

Travelstar 80GN Hard Disk Drive Specification
40
7.3 Signal definitions
The pin assignments of interface signals are listed as follows:Signal definitions
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.
Table 24: Signal definitions
PIN SIGNAL I/O Type PIN SIGNAL I/O Type
01 RESET- I TTL
02 GND
03 DD07 I/O 3–state
04 DD08 I/O 3–state
05 DD06 I/O 3–state
06 DD09 I/O 3–state
07 DD05 I/O 3–state
08 DD10 I/O 3–state
09 DD04 I/O 3–state
10 DD11 I/O 3–state
11 DD03 I/O 3–state
12 DD12 I/O 3–state
13 DD02 I/O 3–state
14 DD13 I/O 3–state
15 DD01 I/O 3–state
16 DD14 I/O 3–state
17 DD00 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 (reserved)
33 DA01 I TTL
34 PDIAG- I/O OD
35 DA00 I TTL
36 DA02 I TTL
37 CS0- I TTL
38 CS1- I TTL
39 DASP- I/O OD
40 GND
41 + 5V logic power
42 + 5V motor power
43 GND
44 (reserved)
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
power designates a power supply to the drive
reserved designates reserved pins which must be left unconnected