Gmch Analog Power - Intel 855GME Design Manual

®
Intel 855GME Chipset and Intel
be placed within 0.5 inches of their respective pins and connected with a 15 mil wide trace. To
avoid coupling with any other signals, maintain a minimum of 25 mils of separation to other
signals.
Figure 61. GMCH HXSWING and HYSWING Reference Voltage Generation Circuit
4.8.3.4

GMCH Analog Power

Table 25
are: VCCASM, VCCQSM, VCCAHPLL, VCCADPLLA, VCCADPLLB, VCCADAC,
VCCAGPLL, and VCCALVDS. VCCADAC, VCCAGPLL, and VCCALVDS do not require an
RLC filter but do require decoupling capacitors.
Figure 62. Example Analog Supply Filter
V
CC
116
®
6300ESB ICH Embedded Platform Design Guide
+VCCP
R1a
301
HXSWING
R2a
C1a
150
summarizes the eight analog circuits that require filtered supplies on the GMCH. They
†
R
DAMP
Noise
†
R is not required for all
DAMP
filters
HYSWING
HXSWING HYSWING
Intel®
855GME
Chipset
GMCH
Figure 62 depicts an example analog supply filter.
Low Pass Filtering
L
C
†
+VCCP
R1b
301
R2b
C1b
150
Filtered V
C
HIGH
BULK
R
DAMP
CC