F85226 Datasheet, PDF (18/44 Pages) Feature Integration Technology Inc. – LPC to ISA Bridge

Fintek
Feature Integration Technology Inc.
F85226
Figure: Chip Select of BIOS Memory
7.2 Serialized Interrupt
Serial Interrupt is a single bus that transmits parallel legacy interrupts and encodes suitable packet at
corresponded moment. The signal refers to LCLK and it operates on an open-drain bus (multi-drop bus)
that is shared with other devices. F85226 supports two operation types included Continuous and Quiet
mode. Eventually, it fully meets SERIRQ specification Version 6.0.
R: Recovery Phase, SERIRQ signal is driven to high level
T: Turn-Around Phase, Devices Tri-state SERIRQ,
S: Sampling Phase, SERIRQ signal is sink to low level
LCLK
RT S
RT SRT
SERIRQ
START
IRQx
STOP
To identify parallel IRQ type on SERIRQ, following the table list supported source.
One SERIRQ Field contains three states included Recovery, Turn-Around and Sample.
F85226
13
July, 2007
V0.25P