HP Vectra XA 5/xxx HP Vectra xA 5/XXX Series 5 /vl 5/xxx series 5 pc Technical - Page 74

4 Summary of the HP/Phoenix BIOS Power Saving and Ergonometry dog timer detects that the BIOS is inactive (and not reloading the timer once every 6 seconds), the computer is turned off without further BIOS acknowledgment. The following table summarizes the main signals that drive or are driven by the Little Ben chip. Signal1 Address Description SMI_OFF User wants to power off: computer enters RPO shutdown mode (computer clock, HDDs all stopped; only RTC, Little Ben and network board still active) SMI_RWU Ã pin 69, LBen channel 7 Signal from RTC, FAX, control panel, and power key on keyboard. Magic Frame from network board: computer wakes up from RPO mode. CoffeeBreak# Æ pin 66, LBen channel 0 Connected to the lock button (coffee break) on the control panel. ASL# Æ pin 65, LBen channel 4 Connected to the Super IO Auto Soft Lock (ASL) timer. Reset by an interrupt from the keyboard or mouse. APM chip-set SMI# Æ pin 67, LBen channel 2 SMIs from the chip set pass first to Little Ben, then are sent on to SMI# the processor on the SMI# line StopClk# Stops the processor clock SMI_CONFIG Tells Little Ben that the processor is in SMM SMI_ACT# SMI_TRIG_EN SMI channels index Ah Used to enable individual SMI channels during the boot process SMI_EN index Bh, bit 0 Enable general SMI generation (during the boot process) SMI status register index 10h This register is cleared when the computer is re-booted SM index 11h, bit 1 When set, computer mains button is disabled index 11h, bit 2 When set, Flash ROM is write protected; Super IO space is write protected (Serial EEPROM access, serial ports configuration, parallel port configuration, flexible disk drive configuration) index 11h, bit 4 When set, flexible disk drive is write protected PWD_EN pin 21 index Dh, bit 3 Not used Super Secure Mode pin 64 (shared with Not used FLPWPT#) 1. Ã indicates triggered on a rising edge; Æ indicates triggered on a falling edge 74