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12 BX400ii Interposer Board User’s Manual
Hardware Reference
3.3 Test Points
Power measurement header descriptions are provided in Table 4.
Table 4. Power Measurement Header Descriptions
Header Voltage Rail Resistor
Effective
Resistance (Ω)
Description
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
P17 +V CPUIO (2.5V) R97 0.01
2.5V used for clock on system
electronics and pullup voltage for
CPU cmos compatibility signals
P19 +VTT_GTL_PU R101 0.01
Low Power GTL +voltage rail for all
GTL termination resistors and
443BX GTL reference
P20 + V5_VTT (5V) R75 1.0
5 V input to Voltage Regulator
subsystem generating core VTT to
the CPU
P21 + VIN (4.75V - 21V) R17 0.025
Primary DC system power supply
[4.75V-21V]fromsystem
electronics board