FM3580 5-Bit VID Controller Integrated with Serial Interface 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鈥檚 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 鈥渁nti-clone鈥?Security controller
I
Configurable Output type
鈥?TTL
鈥?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擄C to +70擄C
I
Package: 20-Pin TSSOP
Block Diagram
Security Encoder
SCL
SDA
ASEL
WP
SMbus
Interface &
Control
Control
Logic
EEPROM &
Register Array
Level
Mux_Sel
/Override
I[4:0]
Muliplexer &
Output Logic
Non_Mux_Out
Y[4:0]
漏 2002 Fairchild Semiconductor Corporation
FM3580 Rev. A.5
1
www.fairchildsemi.com