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參數(shù)資料
| 型號： | TP6508 |
| 英文描述： | Pushbutton Switch; Actuator Diameter:0.078"; Circuitry:6PDT; Switch Operation:6 Changeover Push-Push; Contact Current Max:100mA; Leaded Process Compatible:Yes; Mounting Type:PCB; Switch Function:6PDT |
| 中文描述： | 顯卡 |
| 文件頁數(shù)： | 42/134頁 |
| 文件大?。?/td> | 600K |
| 代理商： | TP6508 |
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P.39
Power Management Controller (P.M.C.)
The TP6508 has a special function which is a power management unit to generate the power
control signals for Dual frequency synthesizer , RAMDAC, other block devices of TP6508, and Montor
output timing . It's implemented with the VESA DPMS(Display Power Management Signaling) stan-
dard and designed to provide power management for Green PC systems . The TP6508 provides trigger
pins and timers to determine when the system is idle . When idle, the TP6508 can remove power from
unused internal block devices . The TP6508 also supports slow refresh DRAM for power saving.
The TP6508 has four main operating modes: Active mode, Standby mode , Suspend mode , and
Off mode. The I/O read/write ( register programming/keyboard request ) , external trigger pins, and
the time-out control the transition between each mode . TP6508 supports one external trigger pins ,
OFF pin .
DPMS States:
State
HSYNC
VSYNC
On(Active)
Pulses
Pulses
Standby
No Pulses
Pulses
Suspend
Pulses
No Pulses
Off
No Pulses
No Pulses
Cover-Close Pulses
Pulses
Active
CRT
Active
Blanked
Blanked
Blanked
Flat Panel
Active
Blanked
Blanked
Blanked
Blanked
Power Saving
None
Minimal
Substantial
Maximum
Minimal
* DPMS Operating Modes:
1. On(Active) Mode
This is the start-up or wake-up mode of the system. The CPU is operating at maximum
speed . Fixed disks and floppy are working with normal situation and the VGA is active normal .
2. Standby Mode
Standby mode is the first power saving mode . The standby mode is entered from the
active mode when the time specified by the P.M.C. time-out register, or user I/O register programming
. Resume may be initiated by I/O register programming, or keyboard request . There are no CRT cycle
on in this mode and turns off internal DAC . But video memory and register access allowed.
3. Suspend Mode
Suspend mode is the lower power saving mode . It is as same as the standby mode to
TP6508's internal power saver except the output of HSYNC and VSYNC signal for various power
saving mode monitor by VESA DMPS standard. The different display sync output between Standy
mode and Suspend mode is descripted on previous 'DMPS States' table . Suspend may be initiated by
the P.M.C. time-out register, or user I/O register programming . Resume may be initiated by I/O
register programming , keyboard request.
4. Off Mode
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