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Theory of Operation 4-11
♦ Provides type F transfers
♦ Interrupt controller
♦ Provides 14 interrupt channels
♦ Independently programmable level/edge triggered channels
♦ Counter/Timers
♦ Provides 8254 compatible timers for system timer, refresh request, speaker
output use
♦ Keyboard controller
♦ Built-in PS2/AT keyboard controller
♦ The specific I/O is used to save the external TTL buffer
♦ Real time clock
♦ Built-in real time clock
♦ 128-byte CMOS RAM with 2
♦ Plug-and-Play port support
♦ Programmable chip select
♦ Steerable interrupt request lines
♦ PMU interface
♦ Supports CPU SMM mode, SMI feature
♦ Supports programmable stop clock throttle
♦ Supports the APM control
♦ Provides external suspend mode switch/turbo switch/ring-in switch
♦ Provides four system states for power saving (on, doze, standby, suspend)
♦ Provides three timers from 1 second to 300 minutes to individually monitor
VGA, MODE, IN status
♦ Supports RTC alarm wake up control
♦ IDE interface
♦ Built-in PCI IDE master controller