Artesyn ATCA-7480 Installation and Use (February 2015) - Manual (Page 132)

Maps and Registers
ATCA-7480 Installation and Use (6806800T17A) 132
5.1.11 IPMC Power Failure Registers
There are 8 failure registers implemented to indicate the cause of a power failure and report
some status information.
The content of the failure registers are also displayed via the seven segment LED displays.
5.1.11.1 ME Power Failure Registers
When an ME failure occurs, the red power failure LED (signal PWR_FAIL_) starts blinking. (The
LED is one second ON and one second OFF).
The error state is kept until ME wakes up (signal SLP_A_ becomes high).
The table below shows all possible failing states and their coding.
Table 5-44 ME Power Failure State Register
Address Offset: 0x08
Bit Description Default Access
2:0 ME Power Failure State. Latched last ME state when
failure occurred. See
Table 5-48 ME Power Failure
States.
Note: Only valid with ME Failure (Bit 7) set
PWR_GOOD:
0 IPMC: r
6:3 Reserved 0 IPMC: r
7 ME Failure. ME state machine sampled a failing ME
Power status:
0: No ME Failure. Normal ME operation.
1: ME failure. ME failure detected. PWR_GOOD:
0 IPMC: r
Table 5-45 ME Power Failure States
State
Coding State
Name
Description
0 ME_OFF Timeout. ASW power good for more than 45ms
also ME is in ME_OFF state.
2 ME_ON: ASW power good lost