82374EB datasheet(157/208 Pages) INTEL

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82374EB82374SB

Table 26 Suggested Default Values For Interrupt Controller Registers

Port

Value

Description of Contents

020h

11h

CNTLR-1 ICW1

021h

08h

CNTLR-1 ICW2 Vector Address for 000020h

021h

04h

CNTLR-1 ICW3 Indicates Slave Connection

021h

01h

CNTLR-1 ICW4 8086 Mode

021h

B8h

CNTLR-1 Interrupt Mask (may vary)

4D0h

00h

CNTLR-1 EdgeLevel Control Register

0A0h

11h

CNTLR-2 ICW1

0A1h

70h

CNTLR-2 ICW2 Vector Address for 0001C0h

0A1h

02h

CNTLR-2 ICW3 Indicates Slave ID

0A1h

01h

CNTLR-2 ICW4 8086 Mode

4D1h

00h

CNTLR-2 EdgeLevel Control Register

0A1h

BDh

CNTLR-2 Interrupt Mask (may vary)

Figure 20 illustrates the sequence software must follow to load the interrupt controller Initialization Command

Words (ICWs) The sequence must be executed for CNTRL-1 and CNTRL-2 After writing ICW1 ICW2 ICW3

and ICW4 must be written in order Any divergence from this sequence such as an attempt to program an

OCW will result in improper initialization of the interrupt controller and unexpected erratic system behavior It

is suggested that CNTRL-2 be initialized first followed by CNTRL-1

In the ESC it is required that all four Initialization Command Words (ICWs) be initialized As shown in Figure

20 all ICWs must be programmed prior to programming the OCWs

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