Gmch Single Generated Voltage Reference Divider Circuit; Separate Gmch And Ich4-M Voltage Divider Circuits For Vref And Vswing; Separate Ich4-M Voltage Divider Circuits For Hivref And Hi_Vswing; Figure 69. Ich4-M Locally Generated Reference Voltage Divider Circuit - Intel 852GM Design Manual

Hub Interface

Figure 69. ICH4-M Locally Generated Reference Voltage Divider Circuit

9.3.2.2.

GMCH Single Generated Voltage Reference Divider Circuit

This option allows the GMCH to use one voltage divider circuit to generate both HLVREF and
HLPSWING voltage references. The reference voltage for both HLVREF and HLPSWING must meet
the voltage specification in Table 61. The resistor values R1, R2, and R3 must be rated at 1% tolerance
(see Table 62). Normal care needs to be taken to minimize crosstalk to other signals (< 10-15 mV). If
the voltage specifications are not met, then individually generated voltage divider circuits for HLVREF
and PSWING is required.

Figure 70. GMCH Locally Generated Reference Voltage Divider Circuit

9.3.3. Separate GMCH and ICH4-M Voltage Divider Circuits for VREF
and VSWING
Sections 9.3.3.1 and 9.3.3.2 provide the option to generate individual voltage reference for VREF and
VSWING separately for GMCH and ICH4-M.
9.3.3.1.

Separate ICH4-M Voltage Divider Circuits for HIVREF and HI_VSWING

This option allows for tuning the voltage references HIVREF and HI_VSWING individually. The
reference voltage for both HIVREF and HI_VSWING must meet the voltage specification in Table 61.
Normal care needs to be taken to minimize crosstalk to other signals (< 10-15 mV).
150
VCCHI
R1
HI_VSWING
C2
C1
R2
ICH4
HIREF
C4
C3
R3
VCCHI
R1
PSWING
C5
C1
R2
GMCH
HLVREF
C3 C6
R3
®
Intel 852GM Chipset Platform Design Guide
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