82374EB datasheet(83/208 Pages) INTEL

83 / 208 page

82374EB82374SB

Bit

Description

Reserved

Must be 0

Slave Identification Code

The Slave Identification code must be programmed to 010b during the

initialization sequence The code stored in ICW3 is compared to the incoming slave identification code

broadcast by the master controller during interrupt acknowledge cycles

345 ICW4INITIALIZATION COMMAND WORD 4

021hINT CNTRL-1

0A1hINT CNTRL-2

Default Value

xxh

Attribute

Write Only

Size

8 Bits

Both ESC interrupt controllers must have ICW4 programmed as part of their initialization sequence Minimally

the microprocessor mode bit bit 0 must be set to a 1 to indicate to the controller that it is operating in an

80x86 based system Failure to program this bit will result in improper controller operation during interrupt

acknowledge cycles Additionally the Automatic End of Interrupt (AEOI) may be selected as well as the

Special Fully Nested Mode (SFNM) of operation

The default programming for ICW4 is 01h which selects 80x86 mode normal EOI buffered mode and special

fully nested mode disabled

Bits 2 and 3 must be programmed to 0 for the ESC interrupt unit to function correctly

Both bit 1 AEOI and bit 4 SFNM can be programmed if the system developer chooses to invoke either

mode

Bit

Description

Reserved

Must be 0

SFNM

Bit 4 SFNM should normally be disabled by writinga0to this bit If SFNMe1 the special fully

nested mode is programmed

MasterSlave Buffer Mode (BUF)

Bit 3 BUF must be programmed to 0 for the ESC This is non-

buffered mode While different programming options are sometimes offered for bits 2 and 3 within the

ESC interrupt unit bits 2 and 3 must always be programmed to 00b

AEOI

Bit 1 AEOI should normally be programmed to 0 This is the normal end of interrupt If

AEOIe1 the automatic end of interrupt mode is programmed

Microprocessor Mode

The Microprocessor Mode bit must be programmed to 1 to indicate that the

interrupt controller is operating in an 80x86 based system Never program this bit to 0

82374EB Folha de dados(PDF) 83 Page - Intel Corporation

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