FM3580 Datasheet, PDF (1/11 Pages) Fairchild Semiconductor – 5-Bit VID Controller with PC Security Element

January 2002
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.
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
Block Diagram
SCL
SDA
ASEL
WP
Level
Mux_Sel
/Override
I[4:0]
SMbus
Interface &
Control
Control
Logic
Security Encoder
EEPROM &
Register Array
Muliplexer &
Output Logic
Non_Mux_Out
Y[4:0]
© 2002 Fairchild Semiconductor Corporation
1
FM3580 Rev. A.5
www.fairchildsemi.com