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1-26 Service Guide
1.6.7.1 PMU Timers
There are several devices related timers available on the V1-LS chip. Each timer may have zero
or more devices assigned to the timer for the purpose of retriggering the timer.
Table 1-15 PMU Timers List
Item Descriptions
Video timer
Timer value 30sec, 1min, 1.5min, 2min, 2.5min, 3min, 3.5min, 4min, 4.5min, 5min, 6min, 7min,
8min, 9min, 10min, 15min, 20min, 30min(if AC plugged-in)
System activities
and timer
retriggers
System activities
− The video display (CRT and LCD) is in power saving mode.
Timer retriggers
− KBC, PS/2 mouse will retrigger the timer..
Detective hardware
change
Parallel/serial timer
Timer value Parallel port/COM1/COM2/FIR: 30sec
System activities
and timer
retriggers
System activities
− Parallel/serial port pins are in standby mode, serial port clock is stopped and
parallel port and UART1 decode in the 87338 chip is disabled.
Timer retriggers
− Parallel port/COM1/COM2/FIR activities
Detective hardware
change
COM1: The pin-25 of U4 MAX3243 (PX3-SPPD#) is from H to L.
Hard disk timer
Timer value First phase heuristic time-out table for entering HDD standby mode: 10sec, 20sec,
30sec, 40sec, 50sec, 60sec, 70sec, 80sec, 90sec, 2min, 3min, 4min, 5min, 30min(if
AC plugged-in)
Second phase fixed timer for entering HDD suspend mode: 10sec
System activities
and timer
retriggers
System activities
− First phase time-out (heuristic) results in hard disk spin down and IDE interface
disable. The second time-out (10sec) results in hard disk power off and IDE
controller clock is stopped and its internal HDD buffer disabled.
Timer retriggers
− The I/O access to 1F0-7, 3F6 will retrigger the timer.
Detective hardware
change
1. The U20 pin Y15(PX3_HDPON) is from H to L, HDD is powered off.
FDD/CD-ROM timer
Timer value The system with internal floppy: 30sec
The system with internal CD-ROM
1
: 1min, 2min, 3min, 4min, 5min, 6min, 7min,
8min, 9min, 10min, 15min, 30min(AC)
1
This parameter is for both internal CD-ROM and external floppy.