82091AA Datasheet, PDF(51/204 Page) Intel Corporation – ADVANCED INTEGRATED PERIPHERAL (AIP)

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82091AA Datasheet, PDF (51/204 Pages) Intel Corporation – ADVANCED INTEGRATED PERIPHERAL (AIP)

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82091AA

Bit

Description

7 3 RESERVED

2 IDE DUAL SELECT (IDUAL) When IDUALe0 the IDE address selection is determined by the

IADS bit When IDUALe1 both the primary and secondary IDE addresses are selected and the

setting of the IADS bit does not affect IDE address selection

1 IDE ADDRESS SELECT (IADS) When IADSe0 the primary IDE address is selected (1F0h â 1F7h

3F6h 3F7h ) When IADSe1 the secondary IDE address is selected (1F0h â 1F7h 376h 377h) For

all hardware configuration modes (SWMB SWAI HWB and HWE) the default is determined by

signal pin strapping options

0 IDE INTERFACE ENABLE (IEN) When IENe0 the IDE interface is disabled (i e the IDE chip

selects (IDECS 1 0 ) DEN and HEN are negated (remain inactive) for accesses to the IDE

primary and secondary addresses) When IENe1 the IDE interface is enabled For all hardware

configuration modes (SWMB SWAI HWB and HWE) the default is determined by signal pin

strapping options

4 2 Hardware Configuration

Hardware configuration provides a mechanism for

configuring certain 82091AA operations at powerup

Four hardware configuration modes provide different

levels of configuration depending on the type of ap-

plication and the degree of hardware software con-

figuration desired The hardware configuration

modes are

Software Motherboard (SWMB)

Software Add-In (SWAI)

Hardware Extended (HWE)

Hardware Basic (HWB)

These modes support a variety of system implemen-

tations For example with Hardware Basic (HWB)

and Hardware Extended (HWE) modes an exten-

sive set of 82091AA configuration options are avail-

able for setting up the 82091AA at powerup This

permits the 82091AA to be used in systems without

82091AA software drivers For many of these sys-

tems access to the 82091AA configuration registers

may not be necessary As such access to these

registers can be disabled via hardware configura-

tion This option could be used to prevent software

from inadvertently re-configuring the 82091AA

51

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