Guide
Hub Interface
R
Intel
®
852GM Chipset Platform Design Guide 151
Figure 71. Individual HIVREF and HI_VSWING Voltage Reference Divider Circuits for ICH4-M
V
CC
HI
R4
R5
C1
C3
R6
R7
HIVREF
HI_VSWING
C4
C2
ICH4-M
Table 63. Recommended Resistor Values for HIVREF and HI_VSWING Divider Circuits for ICH4-M
Signal Recommended Resistor Values VCCHI Capacitor value
HIVREF
(350 mV)
R4 = 487 Ω ± 1%
R5 = 150
Ω ± 1%,
VCCHI=1.5 V C3 = 0.1 µF (near divider)
C2 = 0.01 µF (near component)
HI_VSWING
(800 mV)
R6 = 130 Ω ± 1%
R7 = 150
Ω ± 1%,
VCCHI=1.5 V C1 = 0.1 µF (near divider)
C4 = 0.01 µF (near component)
9.3.3.2. Separate GMCH Voltage Divider Circuits for HLVREF and PSWING
This option allows for tuning the voltage references HLVREF and PSWING individually. The reference
voltage for both HLVREF and PSWING must meet the voltage specification in Table 61. Normal care
needs to be taken to minimize crosstalk to other signals (< 10-15 mV).
Figure 72. Individual HLVREF and PSWING Voltage Reference Divider Circuits for GMCH
V
CC
HI
R4
R5
C1
C3
R6
R7
HLVREF
PSWING
C5
C6
GMCH