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Major Chips Description 2-15
• 32-bit addressability
• Provides compatible DMA transfers
• 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 2µA standby current maximum
• 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
• Supports PIO modes up to mode 5 timings, and multiword DMA mode 0, 1, 2
• 8 x 32-bit pre-read and posted-write buffers
• Dedicated pins for ATA interface
• Supports up to 256 KB ROM size decode
• Reserved USB interface
• 208-pin PQFP package