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LTC2972

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MFR_COMMAND_PLUS Data Contents

BIT(S)

SYMBOL

OPERATION

b[15]

Mfr_command_plus_

reserved

Reserved. Always returns 0.

b[14]

Mfr_command_plus_id

Command plus host ID

0: Mfr_command_plus pointer and page are cached and used for all Mfr_data_plus0 accesses.

1: Mfr_command_plus pointer and page are cached and used for all Mfr_data_plus1 accesses.

b[13:9] Mfr_command_plus_page

Page to be used when peeking or poking via Mfr_data_plus0 or Mfr_data_plus1. Allowed values are 0

through 3. This page value is cached separately for Mfr_data_plus0 and Mfr_data_plus1 based on the value of

Mfr_command_plus_id when this register is written.

b[8:0]

Mfr_command_plus_

pointer

Internal memory location accessed by Mfr_data_plus0 or Mfr_data_plus1. Mfr_data_plus0 and Mfr_data_plus1

pointers are cached separately. Legal values are listed in the CMD Code column of the PMBus COMMAND

SUMMARY table. All other values are reserved, except for the special poke enable/disable values listed in the

Enabling And Disabling Poke Operations section, and the command values listed below for Mfr_status_plus0

and Mfr_status_plus1.

MFR_DATA_PLUS0 and MFR_DATA_PLUS1 Data Contents

BIT(S)

SYMBOL

OPERATION

b[15:0] Mfr_data_plus0

Mfr_data_plus1

A read from this register returns data referenced by the last matching Mfr_command_plus write. More

specifically, writes to Mfr_command_plus by host 0 update Mfr_data_plus0, and writes to Mfr_command_plus

by host1 update Mfr_data_plus1. Multiple sequential reads while pointer = Mfr_fault_Log return the complete

contents of the block read buffer. Block reads beyond the end of buffer return zeros.

A write to this register will transfer the data to the location referenced by the last matching Mfr_command_

plus_pointer when the Poke operation protocol described in the Poke Operation Using Mfr_data_plus0 section

is followed.

MFR_STATUS_PLUS0 and MFR_STATUS_PLUS1 Data Contents

BIT(S)

SYMBOL

OPERATION

b[7:2]

Reserved

b[1]

Mfr_status_plus_poke_

failed0

Mfr_status_plus_poke_

failed1

Status of most recent poke for matching host.

0: Last poke operation did not fail.

1: Last poke operation failed because pokes were not enabled as described in Enabling and Disabling Poke

Operations section.

b[0]

Mfr_status_plus_block_

peek_failed0

Mfr_status_plus_block_

peek_failed1

Status of most recent block peek for matching host.

0: Last block peek was not aborted.

1: Last block peek was aborted due to an intervening fault log EEPROM write, MFR_FAULT_LOG_STORE command,

or standard PMBus block read of MFR_FAULT_LOG. The intervening operation is always completed cleanly.

MFR_STATUS_PLUS0 is at command location 0x2C, and MFR_STATUS_PLUS1 is at command location 0x2D. These correspond to reserved PMBus

command locations. These two status registers can only be read via Command Plus peeks.

Reading Fault Log Using Command Plus and MFR_DATA_PLUS0

Write Mfr_command_plus_pointer = 0xEE with Mfr_command_plus_page = 0 and Mfr_command_plus_id = 0.

Read data from Mfr_data_plus0; each read returns the next data word of the MFR_FAULT_LOG command:

• The first word read is Byte_count[15:0] = 0x00FF.

PMBus COMMAND DESCRIPTION

LTC2972 Datasheet(PDF) 34 Page - Linear Technology

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