Technical information

CHAPTER 4
Expansion Features
Expansion Bay 65
Note
Signal names that begin with a slash (/) are active low. ◆
IDE_ADDR(0–2) IDE device address; used by the computer to select one
of the registers in the drive. For more information, see
the descriptions of the /CS1FX and /CS3FX signals.
IDE_D(0–15) IDE data bus, buffered from IOD(16–31) of the controller
IC. IDE_D(0–15) are used to transfer 16-bit data to and
from the drive buffer. IDE_D(0–7) are used to transfer
data to and from the drive’s internal registers, with
IDE_D(8-15) driven high when writing.
IOCHRDY I/O channel ready; when driven low by the IDE drive,
signals the CPU to insert wait states into the I/O read or
write cycles.
IDE_INTRQ IDE interrupt request. This active high signal is used to
inform the computer that a data transfer is requested or
that a command has terminated.
/IDE_RST Hardware reset to the IDE drive.
Table 4-3 ATA signals on the expansion bay connector (continued)
Signal name Signal description