IBM IC35L040AVVN07-0 Hard Drive Specifications - Page 36

Signal definition

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6.1.2 Signal definition The pin assignments of interface signals are listed in the figure below: PIN SIGNAL I/O Type PIN SIGNAL I/O Type 01 RESET- I TTL 02 GND 03 DD7 I/O 3-state 04 DD8 I/O 3-state 05 DD6 I/O 3-state 06 DD9 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 IOCS16-(**) O OC 33 DA1 I TTL 34 PDIAG- I/O OC 35 DA0 I TTL 36 DA2 I TTL 37 CSO- I TTL 38 CS1- I TTL 39 DASP- I/O OC 40 GND Figure 19. Table of signals 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. Write Operation Read Operation Special Definition (for Ultra DMA) DDMARDYHSTROBE STOP HDMARDYDSTROBE STOP Figure 20. Signal special definitions for Ultra DMA Conventional Definition IORDY DIORDIOWDIORIORDY DIOW- Deskstar 120GXP hard disk drive specifications 22

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6.1.2 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
Figure 19. Table of signals
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.
DIOR-
IORDY
DIOW-
HDMARDY-
DSTROBE
STOP
Read Operation
IORDY
DIOR-
DIOW-
DDMARDY-
HSTROBE
STOP
Write Operation
Conventional Definition
Special Definition
(for Ultra DMA)
Figure 20. Signal special definitions for Ultra DMA
Deskstar 120GXP hard disk drive specifications
22