Intel E7520 user manual Level 3 Debug Voltage References

Dual-Core Intel Xeon processor LV / E7520 Chipset / 6300ESB ICH

8.3Level 3 Debug (Voltage References)

Table 25 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	0.775V	Vref incorrect: check resistor values
		(back side of board)
	8	CPU1 VTT Vref	0.754V	Vref incorrect: check resistor values
		(back side of board)
	9	MCH VTT Vref	0.775V	Vref incorrect: check resistor values

Dual-Core Intel® Xeon® processor LV with Intel® E7520 Chipset and Intel® 6300ESB ICH
User’s Manual	April 2007
58	Order Number: 311274-009