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C-36 Sun Ultra 60 Service Manual • August 2001
■ Determines system clock frequency
■ Controls reset generation
■ Performs PCI bus and miscellaneous interrupt concentration for PSYCHO+
■ Controls flash PROM programming, frequency margining, and lab console
operation
■ 33-MHz operation
■ 3.3-Vdc and 5-Vdc supply voltage
C.1.16 SuperIO
The SuperIO is a commercial, off-the-shelf component that controls the keyboard,
diskette, and parallel port interfaces. It contains a DMA-driven diskette controller,
two serial port controllers, an IEEE 1284 parallel port interface, and an IDE disk
interface (not currently used). The SuperIO drives the various ports directly with
some EMI filtering on the keyboard and parallel port signals. Support for mixed
voltage modes and power management features for low power operation are also
included. Features of the SuperIO include:
■ Two independent serial ports used for keyboard and mouse
■ N82077 diskette drive interface
■ IEEE 1284 parallel port interface
C.2 Power Supply
The system unit uses a 350-watt power supply that operates under the voltage range
of 90 to 264 volts root-mean-square (Vrms) and a frequency range of 47 to 63 Hz. The
maximum input current is 7 amps and the inrush current is limited to 80 peak amps.
The power supply output voltages are listed in
TABLE C-8. The power supply
continues to regulate all outputs for 20 milliseconds after AC power is removed.
TABLE C-8 Power Supply Output Values
Output Voltage (Vdc) Max Current (A) Regulation Band
1 3.3 60.0 3.23 to 3.43
2 5.0 30.0 4.85 to 5.25