PMBus Power System Mgt Protocol Specification – Part II – Revision 1.2X03
© 2009 System Management Interface Forum, Inc. Page 4 of 105
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9.3. Making And Calibrating Output Current Measurements ............................................................... 31
9.4. Deleted ......................................................................................................................................... 32
10. Fault Management And Reporting ................................................................................................... 32
10.1. Monitoring Operation ................................................................................................................ 32
10.2. General Description Of PMBus Device Fault Management ..................................................... 33
10.2.1. Warning Conditions ........................................................................................................... 33
10.2.2. Fault Conditions ................................................................................................................. 33
10.2.3. Clearing Warning Or Fault Bits .......................................................................................... 34
10.2.4. Clearing Individual Bits ...................................................................................................... 34
10.2.5. Clearing Bits In The STATUS_BYTE And STATUS_WORD ............................................ 34
10.2.6. Immediate Reassertion After Clearing If Condition Is Still Present ................................... 35
10.3. Conceptual View Of How Status Bits And SMBALERT# Work ................................................ 36
10.4. Setting Fault And Warning Thresholds ..................................................................................... 37
10.5. Setting The Response To A Detected Fault Condition ............................................................. 37
10.5.1. Response To Voltage, Temperature And TON_MAX Faults ............................................. 38
10.5.2. Response To Current Faults .............................................................................................. 39
10.6. Reporting Faults And Warnings To The Host ........................................................................... 41
10.6.1. SMBALERT# Signal And Process ..................................................................................... 41
10.6.2. Direct PMBus Device To Host Communication ................................................................. 41
10.7. Clearing A Shutdown Due To A Fault ....................................................................................... 42
10.8. Data Transmission Faults ......................................................................................................... 42
10.8.1. Corrupted Data .................................................................................................................. 42
10.8.2. Sending Too Few Bits ........................................................................................................ 42
10.8.3. Reading Too Few Bits ....................................................................................................... 43
10.8.4. Host Sends Or Reads Too Few Bytes ............................................................................... 43
10.8.5. Host Sends Too Many Bytes ............................................................................................. 43
10.8.6. Reading Too Many Bytes .................................................................................................. 44
10.8.7. Device Busy ....................................................................................................................... 44
10.9. Data Content Faults .................................................................................................................. 44
10.9.1. Improperly Set Read Bit In The Address Byte ................................................................... 44
10.9.2. Unsupported Command Code ........................................................................................... 45
10.9.3. Invalid Or Unsupported Data ............................................................................................. 45
10.9.4. Data Out Of Range Fault ................................................................................................... 45
10.9.5. Reserved Bits..................................................................................................................... 46
11. Address, Memory, Communication And Capability Related Commands ......................................... 46
11.1. WRITE_PROTECT ................................................................................................................... 46
11.2. STORE_DEFAULT_ALL ........................................................................................................... 46
11.3. RESTORE_DEFAULT_ALL ...................................................................................................... 47
11.4. STORE_DEFAULT_CODE ....................................................................................................... 47
11.5. RESTORE_DEFAULT_CODE .................................................................................................. 47
11.6. STORE_USER_ALL ................................................................................................................. 48
11.7. RESTORE_USER_ALL ............................................................................................................ 48
11.8. STORE_USER_CODE ............................................................................................................. 48
11.9. RESTORE_USER_CODE ........................................................................................................ 49
11.10. PAGE ........................................................................................................................................ 49
11.11. PHASE ...................................................................................................................................... 51
11.12. CAPABILITY ............................................................................................................................. 51
11.13. QUERY ..................................................................................................................................... 52
11.14. PAGE_PLUS_WRITE ............................................................................................................... 53
11.15. PAGE_PLUS_REA D ................................................................................................................. 53
12. On, Off And Margin Testing Related Commands ............................................................................ 53
12.1. OPERATION ............................................................................................................................. 53
12.2. ON_OFF_CONFIG.................................................................................................................... 54
13. Output Voltage Related Commands ................................................................................................ 56
13.1. VOUT_MODE ........................................................................................................................... 56
13.2. VOUT_COMMAND ................................................................................................................... 56
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