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SLVUAW9C September 2016 – February 2020 UCD90320

UCD90320 Sequencer and System Health Controller PMBus Command Reference

9.1 (B5h) BLACK_BOX_FAULT_INFO (USER_DATA_05)

The read/write block common command returns detail information of the first fault.

1. The time that I happened in milliseconds and days
Whether or not the fault is page specific
The page or GPI that triggered the fault (when applicable)
The type of fault.
Status of all GPOs when the fault occurred
Status of all GPIs when the fault occurred

Clearing the Log: Writing a block whose data bytes are all 0x00 clears BLACK BOX log entries. Nonzero values in any data byte returns a NACK due to Invalid Data. Clearing the black box log will allow to re-log the same GPI fault in both blackbox log and normal fault log.

Table 13. BLACK_BOX_FAULT_INFO Command Format

Byte Number (Write)	Byte Number (Read)	Payload Index	Description
0			CMD = B5
1	0		BYTE_COUNT =18
2	1	0	Bit	Description
			0	paged or non-paged fault
			1:	first fault log valid(1)/not valid(0)
			2:	Reserved
			7:3	fault_page_num
3	2	1	Days(low byte)
4	3	2	Days(high byte)⁽¹⁾
5	4	3	Milliseconds(low byte)⁽²⁾
6	5	4	Milliseconds(middle Byte)
7	6	5	Milliseconds(middle high byte)
8	7	6	Milliseconds(high byte)
			Bit	Description
			7:3	Fault Type see Table 52
			2:0	Milliseconds[26:24]
9	8	7	Fault Value(low byte) See Table 52
10	9	8	Fault Value(middle low byte) See Table 52
11	10	9	Fault Value(middle high byte) See Table 52
12	11	10	Fault Value(high byte) See Table 52
13	12	11	Bit
			0	Not Valid Log(0)/Valid Log(1)⁽³⁾
			7:1	Reserved bits
14	13	12	GPO status bit mask
			Bit	Description
			7:0	GPO[7-0]
15	14	13	Bit	Description
15	14	13	7:0	GPO[15-8]
16	15	14	GPI status bit mask (low byte).
			Bit	Description
			7:0	GPI[7-0]
17	16	15	GPI status bit mask (middle byte)
			Bit	Description
			7:0	GPI[15-8]
18	17	16	GPI status bit mask (high byte)
			Bit	Description
			7:0	GPI[23-16]
19	18	17	GPI status bit mask(high byte)
			Bit	Description
			7:0	GPI[31-24]

(1) The days is offset from 2000-01-01 00:00:00.00. It is responsible of application to add that time base when retrieving the time stamp.

(2) when this bit is set, only the first 10 byte payload data in the blackbox log(BLACK_BOX_FAULT_INFO) is valid, which describes the simple information of the first fault. GPIs and GPOs in the BLACK_BOX_FAULT_INFO, RAILS_WARNING and RAILS_VALUES may not be valid which is decided by the valid log bit.

(3) when this bit set, whole blackbox log is valid. Application can call RAILS_WARNING and RAILS_VALUE command to retrieve the rest black box log information.