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參數(shù)資料
| 型號： | 37B77X |
| 廠商： | SMSC Corporation |
| 英文描述： | ENHANCED SUPER I/O CONTROLLER WITH WAKE UP FEATURES |
| 中文描述： | 增強(qiáng)型超I / O與向上特征喚醒控制器 |
| 文件頁數(shù)： | 20/196頁 |
| 文件大?。?/td> | 573K |
| 代理商： | 37B77X |
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116
Stop Cycle Control
Once all IRQ/Data Frames have completed the
Host Controller will terminate IRQSER activity
by initiating a Stop Frame.
Only the Host
Controller can initiate the Stop Frame. A Stop
Frame is indicated when the IRQSER is low for
two or three clocks.
If the Stop Frame’s low
time is two clocks then the next IRQSER Cycle’s
sampled mode is the Quiet mode; and any
IRQSER device may initiate a Start Frame in
the second clock or more after the rising edge of
the Stop Frame’s pulse. If the Stop Frame’s low
time is three clocks then the next IRQSER
Cycle’s sampled mode is the Continuos mode;
and only the Host Controller may initiate a Start
Frame in the second clock or more after the
rising edge of the Stop Frame’s pulse.
Latency
Latency for IRQ/Data updates over the IRQSER
bus in bridge-less systems with the minimum
IRQ/Data Frames of seventeen, will range up to
96 clocks (3.84
S with a 25MHz PCI Bus or
2.88uS with a 33MHz PCI Bus). If one or more
PCI to PCI Bridge is added to a system, the
latency
for
IRQ/Data
updates
from
the
secondary or tertiary buses will be a few clocks
longer
for
synchronous
buses,
and
approximately double for asynchronous buses.
EOI/ISR Read Latency
Any serialized IRQ scheme has a potential
implementation issue related to IRQ latency.
IRQ latency could cause an EOI or ISR Read to
precede an IRQ transition that it should have
followed. This could cause a system fault. The
host
interrupt
controller
is
responsible
for
ensuring that these latency issues are mitigated.
The recommended solution is to delay EOIs and
ISR Reads to the interrupt controller by the
same amount as the IRQSER Cycle latency in
order to ensure that these events do not occur
out of order.
AC/DC Specification Issue
All
IRQSER
agents
must
drive
/
sample
IRQSER synchronously related to the rising
edge of PCI bus clock. IRQSER (SIRQ) pin uses
the electrical specification of PCI bus. Electrical
parameters will follow PCI spec. section 4,
sustained tri-state.
Reset and Initialization
The IRQSER bus uses RESET_DRV as its reset
signal. The IRQSER pin is tri-stated by all
agents while RESET_DRV is active. With reset,
IRQSER Slaves are put into the (continuous)
IDLE mode. The Host Controller is responsible
for starting the initial IRQSER Cycle to collect
system’s IRQ/Data default values. The system
then follows with the Continuous/Quiet mode
protocol
(Stop
Frame
pulse
width)
for
subsequent
IRQSER
Cycles.
It
is
Host
Controller’s responsibility to provide the default
values to 8259’s and other system logic before
the first IRQSER Cycle is performed.
For
IRQSER system suspend, insertion, or removal
application,
the
Host
controller
should
be
programmed into Continuous (IDLE) mode first.
This is to guarantee IRQSER bus is in IDLE
state before the system configuration changes.
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