Specifications

Pin # Signal name Description
31 INTRQ A tristate signal used to interrupt the host
system. Asserted only when the drive has a
pending interrupt, the drive is selected, and
the host has cleared nIEN in the Device
Control register. If nIEN=1, or the drive is not
selected, this output is in a high-impedance
state, regardless of the presence or absence
of a pending interrupt.
32 IOCS16– A tristate signal that, when active, indicates to
the host system that the 16-bit data port has
been addressed and that the drive is
prepared to send or receive a 16-bit data
word.
33 DA1 Drive I/O address line 1: a 3-bit binary coded
address asserted by the host to access a
register or data port in the drive.
34 PDIAG– Passed diagnostics. Used by slave to signal
to master drive that slave has passed its
internal diagnostics.
35 DA0 Drive I/O address line 0 (see DA1 above).
36 DA2 Drive I/O address line 2 (see DA1 above).
37 CS1FX– Drive I/O chip select decoded from host
address lines. When active, one of the registers
in the Command Block is selected.
38 CS3FX– Drive I/O chip select decoded from host
address lines. When active, one of the registers
in the Control Block is selected.
39 DASP– Dual purpose pin: 1)When drive is slave
(SLV), this pin is used during power up to
signal to the master that a slave is present.
2) At all other times, the signal is active when
the drive is executing a command, and can
be used by the host I/O adapter to send an
activity signal to an LED.
40 Ground Grounding pin
ATA Interface Reference Manual, Rev. C 11