一.ACPI共有六種狀態複習
G3—主機板上只有電池供電；
S0--實際上這就是我們平常的工作狀態，所有設備全開，功耗一般會超過80W；
S1--也稱為POS（Power on Suspend），這時除了通過CPU時鐘控制器將CPU關閉之外，其他的部件仍然正常工作，這時的功耗一般在30W以下；（其實有些CPU降溫軟體就是利用這種工作原理）
S3--這就是我們熟悉的STR（Suspend to RAM），這時的功耗不超過10W；
S4--也稱為STD（Suspend to Disk），這時系統主電源關閉，但是硬碟仍然帶電並可以被喚醒；
S5--這種狀態是最乾脆的，就是連電源在內的所有設備全部關閉，功耗為0。
在STR狀態下，電源仍然繼續為記憶體等最必要的設備供電，以確保資料不丟失，而其他設備均處於關閉狀態，系統的耗電量極低。一旦我們按下Power按鈕（主機電源開關），系統就被喚醒，馬上從記憶體中讀取資料並恢復到STR之前的工作狀態。記憶體的讀寫速度極快，因此我們感到進入和離開STR狀態所花費的時間不過是幾秒鐘而已；而S4狀態，即STD（掛起到硬碟）與STR的原理是完全一樣的，只不過資料是保存在硬碟中。由於硬碟的讀寫速度比記憶體要慢得多，因此用起來也就沒有STR那麼快了。STD的優點是只通過軟體就能實現，比如Windows 2000就能在不支援STR的硬體上實現STD。
二.G3 S5時序
1. G3：表示主機板還沒有插上ATX POWER 的狀態。主機板上只有電池供電
S5：表示主機板有插上ATX POWER，但沒有按下power button的狀態.此時主機板上有5VSB和電池供電
相關聯信號腳的描述
name | description |
VCCRTC | 3.3 V (can drop to 2.0 V min. in G3 state) supply for the RTC well (1 pin). This power is not expected to be shut off unless the RTC battery is removed or completely drained. NOTE: Implementations should not attempt to clear CMOS by using a jumper to pull VccRTC low. Clearing CMOS in an ICH6-based platform can be done by using a jumper on RTCRST# or GPI. |
RTCRST# | RTC Reset: When asserted, this signal resets register bits in the RTC well.NOTES:1. Unless CMOS is being cleared (only to be done in the G3 power state), the RTCRST# input must always be high when all other RTC power planes are on.2. In the case where the RTC battery is dead or missing on the platform, the RTCRST# pin must rise before the RSMRST# pin. |
V5REF_SUS | Reference for 5 V tolerance on resume well inputs (1 pin). This power is not expected to be shut off unless the system is unplugged in desktop configurations or the main battery is removed or completely drained and AC power is not available in mobile configurations. |
VCCSUS3_3 | 3.3 V supply for resume well I/O buffers (20 pins). This power is not expected to be shut off unless the system is unplugged in desktop configurations or the main battery is removed or completely drained and AC power is not available in mobile configurations. |
VCCSUS1_5 | 1.5 V supply for resume well logic (3 pin). This power is not expected to be shut off unless the system is unplugged in desktop configurations or the main battery is removed or completely drained and AC power is not available in mobile configurations.This voltage may be generated internally (see Section 2.22.1 for strapping option). If generated internally, these pins should not be connected to an external supply. |
LAN_RST# | LAN Reset: When asserted, the internal LAN controller will be put into reset. This signal must be asserted for at least 10 ms after the resume well power (VccSus3_3 and VccSus1_5 in desktop and VccLAN3_3 and VccLAN1_5 in mobile) is valid. When de-asserted, this signal is an indication that the resume (LAN for mobile) well power is stable. NOTE: LAN_RST# must de-assert at some point to complete ICH6 power up sequencing. |
RSMRST# | Resume Well Reset: This signal is used for resetting the resume power plane logic. |
