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FM3580 Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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FM3580 Datasheet(HTML) 1 Page - Fairchild Semiconductor |
1 / 11 page 1 www.fairchildsemi.com FM3580 Rev. A.5 FM3580 5-Bit VID Controller with PC Security Element General Description The FM3580 is an standard 5-bit VID controller with an integrated a Security controller. FM3580 extends the typical VID feature to a PC motherboard by offering a security function which deters cloning of PC motherboards. FM3580’s Security block generates a new pseudo-random code each time one of its internal registers is read. The PC BIOS is programmed to poll pseudo-random code from the FM3580 at frequent intervals. If the appropriate code is not read, the system shuts down, or refuses to boot at power-up. The VID controller portion of FM3580 is identical to FM3560 and is pin compatible with FM3560. FM3580 is designed using low power CMOS technology. Block Diagram January 2002 Features I VID controller similar to FM3560 I Integrated “anti-clone” Security controller I Configurable Output type — TTL — Open-Drain I Pin compatible to FM3560 I SMBus interface to Security/VID controls I Operating V CC : 2.7V to 5.5V I Operating Temp: 0°C to +70°C I Package: 20-Pin TSSOP © 2002 Fairchild Semiconductor Corporation SMbus Interface & Control Muliplexer & Output Logic Security Encoder EEPROM & Register Array Control Logic /Override Level Mux_Sel I[4:0] WP SDA ASEL SCL Y[4:0] Non_Mux_Out |
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