AMD 10 User Manual

26237C—May 2003

The VID codes and corresponding voltage levels are shown in
Table 27.

For more information, see the “Required Circuits” chapter of
the AMD Athlon™ Processor-Based Motherboard Design Guide,
order# 24363.

VREFSYS (W5) drives the threshold voltage for the system bus
input receivers. The value of VREFSYS is system specific. In
addition, to minimize V

CC_CORE

 noise rejection from VREFSYS,

include decoupling capacitors. For more information, see the
AMD Athlon™ Processor-Based Motherboard Design Guide, order#
24363.

ZN (AC5) and ZP (AE5) are the push-pull compensation circuit
pins. In Push-Pull mode (selected by the SIP parameter
SysPushPull asserted), ZN is tied to V

CC_CORE

 with a resistor

that has a resistance matching the impedance Z

0

 of the

transmission line. ZP is tied to VSS with a resistor that has a
resistance matching the impedance Z

0

 of the transmission line.

00000

1.850

10000

1.450

00001

1.825

10001

1.425

00010

1.800

10010

1.400

00011

1.775

10011

1.375

00100

1.750

10100

1.350

00101

1.725

10101

1.325

00111

1.675

10111

1.275

01000

1.650

11000

1.250

01001

1.625

11001

1.225

01010

1.600

11010

1.200

01011

1.575

11011

1.175

01100

1.550

11100

1.150

01101

1.525

11101

1.125

01110

1.500

11110

1.100

01111

1.475

11111

No CPU