FM3565MT20X ,CPU CONFIGURATION CONTROLLER Register/Multiplexer for Microprocessor VIDFM3565 CPU CONFIGURATION CONTROLLERRegister/Multiplexer for Microprocessor VIDPreliminaryMarch 200 ..
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FM3565MT20-FM3565MT20X
CPU CONFIGURATION CONTROLLER Register/Multiplexer for Microprocessor VID
FM3565 CPU CONFIGURATION CONTROLLER Register/Multiplexer for Microprocessor VID Preliminary March 2001 FM3565 CPU CONFIGURATION CONTROLLER Register/Multiplexer for Microprocessor VID The serial port is an IIC compatible slave-only interface and General Description supports both 100kbit and 400kbit modes of operation. The port The Fairchild FM3565 replaces the PC motherboard’s CPU is used to read the I-Port and to write data to the internal non- configuration switches with an electronic implementation, consist- volatile registers. The FM3565 is fabricated with advanced CMOS ing of a 5-bit multiplexed port, standard 2-wire bus interface, and technology to achieve high density and low power operation. non-volatile latches with external hardware control. Features The FM3565 multiplexes the I-port input signals with two internal non-volatile registers that can be loaded through the serial port. � Extended Operating Voltage Range 3.0V-5.5V The multiplexer output is under hardware control, and is deter- � IIC Compatible Slave Interface. mined by the inputs OVRD, MUXSEL, and A/B. Pull-up resistors � ESD performance: Human body model > 2000V are provided on the input port to accommodate connections to open drain outputs and to eliminate the need for external resistors. � Open-Drain Outputs The device has open-drain outputs for easy interface to devices with different V Levels. DD Block Diagram I [4:0] Y [4:0] Mux1 SOPRA Mux2 SOPRB MXSB, MXSA IIC Read Logic Mux3 MUXSEL Control Logic A/B OVRD SDA Shift Slave Address IIC Register Interface Register SCL Comparator ASEL Start/Stop Logic 1 © 2001 FM3565 Rev. A.1
