Guide

Platform Design Checklist
R
238 Intel
®
852GM Chipset Platform Design Guide
14.3. Design Checklist Implementation
The voltage rail designations in this checklist are as general as possible. The following table describes
the equivalent voltage rails in the Intel reference board schematics.
Checklist Rail Intel CRB Rail On S0-S1 On S3 On S4 On S5 Notes
Vcc1_2 +V1.2S_GMCH_CORE,
+V1.2S_GMCH_HUB,
+V1.2S_GMCH_HGPLL,
+V1.2S_GMCH_DPLL,
+V1.2S_GMCH_ASM
X
Vcc1_25 +V1.25S [DDR_Vtt] X 4
Vcc1_5 +V1.5S_GMCH_DVO,
+V1.5S_GMCH_ALVDS,
+V1.5S_GMCH_ADAC,
+V1.5S_GMCH_DLVDS,
+V1.5S_ICH,
+V1.5S_ICHHUB
X
VccSus1_5 +V1.5_ICHLAN X X 1,3
V1_5ALWAYS +V1.5A_ICH X X X X
VccSus2_5 +V2.5_GMCH_SM,
+V2.5_GMCH_QSM,
+V2.5_GMCH_TXLVDS,
+V2.5_DDR
X X
Vcc3_3 +V3.3S_ICH,
+V3.3S_GMCH_GPIO,
+V3.3S_CLKRC,
+V3.3S_SPD,
+V3.3S_LVDS,
+V3.3S_FWH
X
VccSus3_3 +V3.3_ICHLAN,
+V3.3_LAN
X 1,2,3
V3ALWAYS +V3.3ALWAYS_ICH X X X X
Vcc5 +V5S_DAC X
VccSus5 +V5_USB X X 1,3
V5ALWAYS +V5A_ICH X X X X
Vcc12 +V12S X
VccRTC +V_RTC X X X X
VCCP +VCC_IMVP X 5
VCCA +VCC_VID X 6
NOTES:
1. A rail powered in Sx is dependent on implementation.
2. VccLANx rail is powered on in Sx is dependent on implementation.
3. xALWAYS rail can be the SUS rail depending on implementation.
4. Vcc1_25 is the 1.25 V VTT rail for DDR.
5. For the Mobile Intel Pentium 4 Processor-M Front Side Bus, VCCP is the 1.2 V-1.3 V. Note that VCCP is the
supply to both the Vtt and Vcore for Mobile Intel Pentium 4 Processor-M.
6. VCC_VID is 1.2 V for processor PLL and VID circuitry.