Artesyn Embedded Technology ATCA-7540, Installation And Use Manual, Page: 133 / 324

Maps and Registers
ATCA-7540 Installation and Use (6806871A01A) 133
The table below shows the failing cause for the ME power failure.
5.1.11.2 Payload Power Failure Registers
When a payload power failure occurs, the red power failure LED is switched ON (signal
PWR_FAIL_ is driven low).
The power failing state is kept until payload power is turned off:

Manual powering: Setting the switch, SW100.1 from ON to OFF.

IPMC controlled powering: The IPMC shut down the payload power (signal
IPMC_VP48_EN_ is deasserted)
Table 5-46. ME Power Failure Cause Register
Address Offset: 0x09
Bit Description Default Access
0
Active Sleep Well (ASW) power failure:
0: No ASW power failure. ASW power is as expected.
1: ASW power failure. ASW power has different value as
expected.
Note: Only valid when ME Failure (Bit 7) of ME Power
Failure State Register (
Table 5-47
) is set.
PWR_GOOD:0 IPMC: r
7:1 Reserved 0 IPMC: r
Table 5-47. Payload Power Failure State Register
Address Offset: 0x0A
Bit Description Default Access
4:0
Payload Power Failure State. Latched last Payload Power
state when failure occurred. See
Table 5-48
.
Note: Only valid with Payload Failure (Bit 7) is set.
PWR_GOOD:0 IPMC: r
6:5 Reserved 0 IPMC: r
7
Payload Power Failure. Payload Power state machine
sampled a failing Payload Power status:
0: No Payload Power Failure. Normal Payload operation.
1: Payload Power failure. Payload Power failure
detected.
PWR_GOOD:0 IPMC: r