Intel E7520 User Manual
Dual-Core Intel Xeon processor LV / E7520 Chipset / 6300ESB ICH
Dual-Core Intel
®
Xeon
®
processor LV with Intel
®
E7520 Chipset and Intel
®
6300ESB ICH
User’s Manual
April 2007
58
Order Number: 311274-009
8.3
Level 3 Debug (Voltage References)
includes the first items to look at when debugging a board that is not booting.
Table 25.
Level 3 Debug (Voltage Reference)
Step
Test
Pass/Fail Criteria
Cause of Failure
1
MCH DDR2 Channel A Vref
0.9 V
Vref incorrect: check resistor values
2
MCH DDR2 Channel B Vref
0.9 V
Vref incorrect: check resistor values
3
MCH Hublink Vref
0.354V
Vref incorrect: check resistor values
4
MCH Hublink Vswing
0.804V
Vswing incorrect: check resistor values
5
ICH Hublink Vref
0.347V
Vref incorrect: check resistor values
6
ICH Hublink Vswing
0.696V
Vswing incorrect: check resistor values
7
CPU0 VTT Vref
(back side of board)
0.775V
Vref incorrect: check resistor values
8
CPU1 VTT Vref
(back side of board)
0.754V
Vref incorrect: check resistor values
9
MCH VTT Vref
0.775V
Vref incorrect: check resistor values