1Presentation Title Barbados Power Sequence EE team member: Jack CH Chang, Jia Chuang, Paul Hsu EE Lead:Vernon Ho

2Presentation Title Barbados Block Diagram

3Presentation Title  Please link to >>>>>> Power on sequence block diagram

4Presentation Title How can we know Macallen3 is working? 1) Use probe to touch the DBG2 pin 2 ( DEBUG_OUT ) without inserting AC adapter. 2) As for oscilloscope, set up Trigger Mode : Normal. 3) Final step that have to insert AC adapter but do not press Power Button. 4) Eventually, we should have 4 set of pulses as below.

5Presentation Title Good Signal From Macallen

6Presentation Title Procedure Of Checking Macallen Pulses a) If we couldn’t have such pulses from Macallen3. b) Please go back to check the signal step by step. +3.3VRTC +3VALW DEBUG_OUT X3( PIN 1, 2, XTAL ). c) There are several circuit portion listed below.

7Presentation Title Macallen3 need VCCRTC Power Page 29

8Presentation Title Macallen3 receive ACAV_IN

9Presentation Title Macallen3 output ALWON

10Presentation Title Macallen3 Reset and Start Working Reset Macallen See Page 30

11Presentation Title Macallen3 Output Pulses

12Presentation Title Procedure Of Checking No Power Issues First Case: No +3VALW and +5VALW power a) Firstly, check if Charger U5 pin6 ACAV_IN drive high? b) Check U13 pin 20 V+ get 19.5V? +3VALW and +5VALW power use LDO to generate. b) Check if ALWON is high?(3.3V signal) See page 42 and 39.

13Presentation Title Procedure Of Checking No Power Issues Symptom : 3 LED light turn on entirely First Case: a) Firstly, you can jump to check VCC_CORE power plane. b) Does CPU power comes up? c) If doesn’t. Please go back to check with the power sequence from beginning as +5VSUS/+3VSUS +1.8VSUS_PG SUSPWROK RUN_ON +1.05VRUN_PWRGD RUNPWROK. d) These action will check which power plane have no power up.

14Presentation Title Procedure Of Checking No Power Issues Second Case: a) Assumed that CPU voltage can attain 0.9 Volt above. b) We may prove that the rest of power plane before VCC_CORE power plane would be fine. c) Afterward, please check with PLT_RST1# GTL_CPURST#. d) If PLT_RST1# still can’t exist, we can check the following signal RESET_OUT( From Macallen3) IMVP_PWROK. ICH_PWROK e) If GTL_CPURST# can’t driven high, go back to check the PLT_RST1#. f) In addition, we can check whether reference voltage( 2/3 Vcc_IO ) for GMCH correct or not, that is, H_VREF ( R108 pin 2)

15Presentation Title Procedure Of Checking No Power Issues 1) If both PLT_RST1# and GTL_CPURST# driven high. We’ll keep tracking the next signal which connect between CPU and GMCH, that is, GTL_ADS#. ( Fig.1 ). 2) We can assume that CPU may failure if we can’t get these pulses in Fig.1. 3) Another case is only show up one pulse in Fig.1 that we can suspect the failure in U32 ( Bios Rom ) or CPU NG.

16Presentation Title Fig.1 ( GTL_ADS# ) GTL_ADS# is the “ first signal ” generated by CPU,

17Presentation Title LPC_LFRAME# WAVEFORM COME OUT AFTER GTL_ADS# PRODUCED BY CPU

18Presentation Title CPU access BIOS data flow N/BS/BKBCCPU VCC Clock GTL_CPURST# Reset GTL_ADS#DMILPC_LFRAME # GTL_TRDY#DMI GTL_D#(63:0) LAD(3:0) BIOS VCC A(19:0) KBC_D(7:0)

19Presentation Title Barbados Power Sequence Waveform Please reference to Proto-1.0 board power sequence.

20Presentation Title Keyboard LEDs Error code Please see attached file=> Power Event log: