9.1.2 Signal definition
The pin assignments of interface signals are listed in the figure below:
––GND40OCI/ODASP-39
TTLICS1-38TTLICSO-37
TTLIDA236TTLIDA035
OCI/OPDIAG-34TTLIDA133
OCOIOCS16- (**)323-stateOINTRQ31
––GND30TTLIDMACK-29
TTLICSEL283-stateOIORDY(*)27
––GND26TTLIDIOR-(*)25
––GND24TTLIDIOW-(*)23
––GND223-stateODMARQ21
––key(20)––GND19
3-stateI/ODD15183-stateI/ODD017
3-stateI/ODD14163-stateI/ODD115
3-stateI/ODD13143-stateI/ODD213
3-stateI/ODD12123-stateI/ODD311
3-stateI/ODD11103-stateI/ODD409
3-stateI/ODD10083-stateI/ODD507
3-stateI/ODD9063-stateI/ODD605
3-stateI/ODD8043-stateI/ODD703
––GND02TTLIRESET-01
TypeI/OSIGNALPINTypeI/OSIGNALPIN
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
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