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參數(shù)資料
| 型號(hào)： | SIS5595 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Pentium PCI System I/O Chipset |
| 中文描述： | 奔騰的PCI系統(tǒng)I / O芯片 |
| 文件頁數(shù)： | 52/216頁 |
| 文件大?。?/td> | 2208K |
| 代理商： | SIS5595 |
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SiS5595 PCI System I/O Chipset
Preliminary V2.0 Nov. 2, 1998 46 Silicon Integrated Systems Corporation
made. In a system equipped with the ATX power supply, it is recommended to design the
power conversion circuitry powered by both the AUX5V and battery. In practical application,
the PSRSTB# is low only when both the battery and the AUX5V is low. That is, PSRSTB# is
low whenever the battery happens to be exhausted and the power supply is not plugged yet.
Most of the cases in the application, the PSRSTB# is first restored to high by battery. As long
as the PSRSTB# is high and the system is in power down state (PWRGD is low), the power
up events can be recognized and results in the assertion of the PS_ON# to have the ATX
power supply provide VDD5V for the system. It is now obvious why the conversion circuitry
should use the AUX5V or battery for the power source. This ensures that the APC circuit
block can keep working while VDD5V is removed, and can sense the “Power Up Request
Events” to wake up the system by activating PS_ON#. In a word, RTC and APC controller
must be powered by AUX5V/battery through RTCVDD, and PSRSTB# signal must be high,
so that Power Up Request Events can wake up system power.
3.7.2.2 Power Up Request Events
During the power down period, the following events can power up the PC main board by the
assertion of PS_ON#. They are Power Button On event (via PWRBT#), Hot Key Match event
(via Keyboard Controller), Password Match event (via Keyboard Controller), RTC Alarm On
event (via RTC Alarm), Ring Up event (via RING), Power Management Event 1 (via PME1#),
Power Management Event 0 (via PME0#). Each power up function has its enable/disable bit
specified in APC Registers. Except Power Button On event, all the rest power up events are
enabled when APC_EN is set. APC module also provides five status bits to record the power
up request events, they are MNUP_STS, ALMUP_STS, RNUP_STS, PME1_STS, and
PME0_STS.
Note that PME0# and PME1# are low active logic and must be pulled high by external
resistors. If they are pulled high by AUX5V and the system AC power source is suddenly off
(that is, VDD5V and AUX5V are both disappeared), APC may recognize this as a power on
event and will activate PS_ON#. If the AC power source is recovered within 4 seconds, the
ATX power supply will be activated by this event. If PS_ON# is asserted due to an AC power
source suddenly off event and the AC power source is not recovered within 4 seconds, APC
will dessert PS_ON# automatically. In other words, APC will sample PWRGD while PS_ON#
is asserted. If PS_ON# is asserted and PWRGD is not asserted within 4 seconds, APC will
recognize this as a power failure event and will de-assert PS_ON# automatically. APC
module provides a PSON_RSM bit (APC 07h[5]) to disable this power failure detecting
function. While programming a 1 to this bit, PS_ON# can only be de-asserted by all power
down events (Power Button Override, Software Power Off, S3 Power Off, and S5 Power
Off). If RING is set to active low mode and the
System Powered-up by Ring
function is
enabled, it will show the same characters, too.
The following is the detail description of these power-up events:
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