cs5535 National Semiconductor Corporation, cs5535 Datasheet - Page 139
cs5535
Manufacturer Part Number
cs5535
Description
Geode Cs5535 Companion Multi-function South Bridge
Manufacturer
National Semiconductor Corporation
Datasheet
1.CS5535.pdf
(555 pages)
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Revision 0.8
LPC Port Functional Description
4.13.3 Serial IRQ
The LPC supports a serial IRQ scheme. This allows a sin-
gle signal to be used to report ISA-style interrupt requests.
Because more than one device may need to share the sin-
gle serial IRQ signal, an Open Collector signaling scheme
is used.
Serial interrupt information is transferred using three types
of frames: a Start frame, one or more IRQ Data frames,
and one Stop frame (see Figure Figure 4-42, Figure 4-43,
and Figure 4-44 on page 140). There are also two modes
of operation. Quiet mode, initiated by the peripheral, and
Continuous mode, initiated by the host:
1)
2)
Data Frame
Once the Start frame has been initiated, all of the serial
interrupt peripherals must start counting frames based on
the rising edge of the SERIRQ. Each of the IRQ/DATA
frames has exactly three phases of one clock each: a Sam-
ple phase, a Recovery phase, and a Turn Around phase.
During the sample phase, the device drives SERIRQ low if
the corresponding interrupt signals should be active. If the
corresponding interrupt is inactive, then the devices should
not drive the SERIRQ signal. It will remain high due to pull-
up registers. During the other two phases (Turn Around
and Recovery), no device should drive the SERIRQ signal.
The IRQ/DATA frames have a specific order and usage as
shown in Table 4-26.
Quiet (Active) Mode: To indicate an interrupt, the
peripheral brings the SERIRQ signal active for one
clock, and then places the signal in TRI-STATE mode.
This brings all the state machines from the Idle state to
the Active state.
The host then takes control of the SERIRQ signal by
driving it low on the next clock, and continues driving it
low for 3-7 clocks more (programmable). Thus, the
total number of clocks low will be 4-8. After those
clocks, the host drives SERIRQ high for one clock and
then places SERIRQ into the TRI-STATE mode.
Continuous (Idle) Mode: In this mode, the host ini-
tiates the Start frame, rather than the peripherals. Typ-
ically,
(acknowledges). The host drives SERIRQ low for 4-8
clocks. This is the default mode after reset; it can be
used to enter the Quiet Mode.
this
is
done
to
update
IRQ
(Continued)
status
139
Stop Frame
After all of the Data frames, a Stop frame is performed by
the host. This is accomplished by driving SERIRQ low for
two to three clocks. The number of clocks determines the
next mode:
• If the SERIRQ is low for two clocks, the next mode is the
• If SERIRQ is low for three clocks, the next cycle is the
Quiet mode. Any device may initiate a Start frame in the
second clock (or more) after the rising edge of the Stop
frame.
Continuous mode. Only the host may initiate a Start
frame in the second clock (or more) after the rising edge
of the Stop frame.
Date Frame Number
31-21
Table 4-26. IRQ Data Frames
10
11
12
13
14
15
16
17
18
19
20
0
1
2
3
4
5
6
7
8
9
SMI# (Not Supported)
Unassigned
IOCHK#
Usage
IRQ10
IRQ11
IRQ12
IRQ13
IRQ14
IRQ15
INTB#
INTC#
INTD#
INTA#
IRQ0
IRQ1
IRQ3
IRQ4
IRQ5
IRQ6
IRQ7
IRQ8
IRQ9
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