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System Board
3.7
HARD DISK INTERFACE
General
The hard disk drive connector which is fitted on the LS Pro system board is an
IDE connector which conforms to the ATA interface standard.
The hard disk drive is accessed via a group of I/O ports at 01F0-01F7h. The
function of each port is given in section 5.
The connector is buffered from the system bus by bi-directional transceivers.
A pinout of this and the hard disk drive power connector is given at the rear
of this section.
Interface signal descriptions
Host reset
Reset signal to the drive. Active low during system power up.
Host data 0-15
16-bit bi-directional data bus between the system board and the drive.
Host I/O channel ready
This line allows the drive to lengthen I/O read and write cycles by generating
system board wait states. The signal is normally high and is driven low by the
drive if an I/O cycle is to be lengthened.
Host IOW
Write strobe. This signal clocks data from the system board to the drive on the
data bus.
Host IOR
Read strobe. This signal clocks data from the drive to the system board on the
data bus.
Host IRQ14
This is the interrupt signal from the drive. This signal is active high when the
drive is selected and the drive interrupt enable bit (IEN) is activated by the
system board. An interrupt is cleared when the drive receives the next
command, when the drive status register is read, or when the drive is reset.
Host IOCS16
Informs the system board that the drive data register has been enabled and the
drive is prepared to perform a 16-bit I/O transfer.
Host ADDR 0-2
These lines are used to select registers on the drive.
3/16 LS PRO HARDWARE TECHNICAL REFERENCE
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