82801DB Datasheet, PDF(193/587 Page) Intel Corporation – Intel 82801DB I/O Controller Hub 4 (ICH4)

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82801DB Datasheet, PDF (193/587 Pages) Intel Corporation – Intel 82801DB I/O Controller Hub 4 (ICH4)

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Functional Description

Figure 5-18. USB Legacy Keyboard Enable and Status Paths

KBC Accesses

PCI Config

Read, Write

Comb.

Decoder

60 READ

S

D

Clear SMI_60_R

R

EN_SMI_ON_60R

AND

Same for 60W, 64R, 64W

To Individual

"Caused By"

"Bits"

SMI

OR

EN_PIRQD#

AND

To PIRQD#

USB_IRQ

Clear USB_IRQ

S

D

R

EN_SMI_ON_IRQ

AND

To "Caused By" Bit

IntelÂ® 82801DB ICH4 Datasheet

193

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