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FM3570 Folha de dados(PDF) 1 Page - Fairchild Semiconductor |
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FM3570 Folha de dados(HTML) 1 Page - Fairchild Semiconductor |
1 / 8 page 1 www.fairchildsemi.com www.fairchildsemi.com FM3570 Rev. A FM3570 CPU CONFIGURATION CONTROLLER Register/Multiplexer for Microprocessor VID General Description The Fairchild FM3570 replaces the CPU motherboard’s configu- ration switches with an electronic implementation consisting of a 4/5-bit multiplexed, 1-bit latched port, standard 2-wire bus inter- face, and non-volatile latches. The FM3570 multiplexes the I-port input signals with two internal non-volatile registers that can be loaded through the serial port. The multiplexer is selected via the serial port and defaults to the I-port upon power-up. Pull-up resistors are provided on the input port to accommodate connections to open-drain outputs and to eliminate the need for external resistors. The device has open- drain outputs for easy interface to devices with different V DD levels. Block Diagram Preliminary March 2001 SOPRA SOPRB IIC Interface Start/Stop Logic Shift Register Slave Address Register Comparator Control Logic Mux3 Mux2 Non_Mux_Out Y[4:0] I[4:0] IIC Read Logic SDA SCL ASEL OVRD MUXSEL MXSB, MXSA Mux1 The serial port is an IIC compatible slave-only interface and supports both 100kbit and 400kbit modes of operation. The port is used to read the I-Port, write data to the internal non-volatile registers and select whether the I-port or one of the internal non- volatile registers is output to the Y-port. The FM3570 is fabricated with advanced CMOS technology to achieve high density and low power operation. Features I Extended Operating Voltage Range 3.0V-5.5V I IIC Compatible Slave Interface. I ESD performance: Human body model > 2000V I Choice of 2.5V Outputs or Open-Drain Outputs © 2001 Fairchild Semiconductor Corporation |
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Descrição semelhante - FM3570 |
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