Hardware Reference

3.3Test Points

Power measurement header descriptions are provided in Table 4.

Table 4. Power Measurement Header Descriptions

Header

Voltage Rail

Resistor

Effective

 

Description

Resistance (

)

 

 

 

 

 

 

 

 

 

 

P1

+VGTLREF_BX (5/9 VTT)

R28

0.01

 

GTL reference voltage for 440BX

 

 

 

 

 

 

P2

+V3_AGPREF (3.3V)

R45

0.01

 

3.3 V rail for 440BX AGPset:

 

82443BX reference

 

 

 

 

 

 

 

 

 

 

 

P5, P6

+V3_BX (3.3V)

R57

0.01

 

3.3 V rail for BX core

 

 

 

 

 

 

P7

+V3_PU (3.3V)

R58

0.01

 

3.3 V rail for pull-ups

 

 

 

 

 

 

P8

+V3_VR (3.3V)

R59

0.01

 

3.3 V rail for voltage regulator

 

subsystems

 

 

 

 

 

 

 

 

 

 

 

P15

+VTT MPII (1.6V)

R10, R117

0.0005

 

Core Processor Voltage

 

 

 

 

 

 

P16

+ VTT_BX

R90

0.01

 

Low Power GTL +voltage rail for

 

443BX Host Bus interface pins

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.5V used for clock on system

P17

+V CPUIO (2.5V)

R97

0.01

 

electronics and pullup voltage for

 

 

 

 

 

CPU cmos compatibility signals

 

 

 

 

 

 

 

 

 

 

 

Low Power GTL +voltage rail for all

P19

+VTT_GTL_PU

R101

0.01

 

GTL termination resistors and

 

 

 

 

 

443BX GTL reference

 

 

 

 

 

 

 

 

 

 

 

5 V input to Voltage Regulator

P20

+ V5_VTT (5V)

R75

1.0

 

subsystem generating core VTT to

 

 

 

 

 

the CPU

 

 

 

 

 

 

 

 

 

 

 

Primary DC system power supply

P21

+ VIN (4.75V - 21V)

R17

0.025

 

[4.75 V-21 V] from system

 

 

 

 

 

electronics board

 

 

 

 

 

 

12

BX400ii Interposer Board User’s Manual

Page 12
Image 12
Intel BX400II user manual Test Points, Power Measurement Header Descriptions