Deskstar T7K500 Hard Disk Drive Specification
23
6.2 Signal definitions (PATA model)
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 13: 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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