文档介绍：AGP4X ,66MHz ,32bit MDC CON. VGA ATI M10-P PSB LPC, 33MHz , 4 bit MINI PCI Hub Interface66MHz , 266MB/s (HI ) RJ11 LCD Header DDR VR 33MHz PCI , 32bit ATA100 , 16bit ICH4-M 421BGA 478 uFCPGA Clock generator WIRELESS System DC/DC AC97 Pentium M Processor 266 DDR SDRAM , 64bit Intel 855PM MCH 593 uFCBGA CPU Thermal Sensor IMVP IV VR BIOS 4Mbit ICS950812 BGA DDR CHANL A CRTConnector ( ) Type-III R15B REV :A 400MHz , 64Bit M38857 FAN CON. SMC/KBC Scan KB LAN_PHY 82562EM POWER SWITCH R5532V CARDBUS R5C551 1394 CON. Type-II SLOT AC97 CODEC SIGMATEL TPA0202 AMP SPEAKERS LQFP48 ATAC9752 RJ45 DVD SO DIMM 0 () SO DIMM 1 () INT MIC INT JACK LMV358 MIC AMP SPDIF JACK LINE OUT JACK HD ATA100 , 16bit ( ) BGA DDR CHANL B 64bit 64bit USB1 USB0 USB2 Block Diagram SCHEMATIC ANNOTATIONS AND BOARD INFORMATION PCI Devices Page 3 CPU Page 4 CPU_POWER Page 5 CPU_THERMAL Page 6 855 PM MCH-1 Page 7 855 PM MCH-2 Page 8 855 PM _POWER Page 9 DDR SO-DIMM Page 10 DDR termination-S Voltage Rails (SYSTEM) +VDC Primary DC system power supply(10 to 21V) +VCC_CORE Core voltage for pro cessor +VCCP rail for processor I/O + for 855PM CORE(off in S3-S5) + DDR Termination voltage (off in S3-S5) + switched power rail (off in S3-S5) + always on power rail + power rail(off in S4-S5) + switched power rail (off in S3-S5) + power rail for DDR + always on power rail + power rail(off in S4-S5) + switched power rail(off in S3-S5) +V5_ALWAYS always on power rail +V5 power rail(off in S4-S5) +V5S switched power rail(off in S3-S5) +V12S switched power rail(off in S3-S5) Page 48 Page 49