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 (Ω | ) | |||||
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P1 | +VGTLREF_BX (5/9 VTT) | R28 | 0.01 |
| GTL reference voltage for 440BX | |
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P2 | +V3_AGPREF (3.3V) | R45 | 0.01 |
| 3.3 V rail for 440BX AGPset: | |
| 82443BX reference | |||||
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P5, P6 | +V3_BX (3.3V) | R57 | 0.01 |
| 3.3 V rail for BX core | |
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P7 | +V3_PU (3.3V) | R58 | 0.01 |
| 3.3 V rail for | |
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P8 | +V3_VR (3.3V) | R59 | 0.01 |
| 3.3 V rail for voltage regulator | |
| subsystems | |||||
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P15 | +VTT MPII (1.6V) | R10, R117 | 0.0005 |
| Core Processor Voltage | |
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P16 | + VTT_BX | R90 | 0.01 |
| Low Power GTL +voltage rail for | |
| 443BX Host Bus interface pins | |||||
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| 2.5V used for clock on system | |
P17 | +V CPUIO (2.5V) | R97 | 0.01 |
| electronics and pullup voltage for | |
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| CPU cmos compatibility signals | |
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| Low Power GTL +voltage rail for all | |
P19 | +VTT_GTL_PU | R101 | 0.01 |
| GTL termination resistors and | |
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| 443BX GTL reference | |
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| 5 V input to Voltage Regulator | |
P20 | + V5_VTT (5V) | R75 | 1.0 |
| subsystem generating core VTT to | |
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| the CPU | |
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| Primary DC system power supply | |
P21 | + VIN (4.75V - 21V) | R17 | 0.025 |
| [4.75 | |
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| electronics board | |
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12 | BX400ii Interposer Board User’s Manual |