Instruction Manual

MAX15303 PMBus Command Set User’s Guide

Page 42 of 52

Memory and Storage Commands

STORE_DEFAULT_ALL

Reference:

Standard Command

Lockable:

Yes

Command Code:

0x11

Format:

N/A

Data Bytes:

Units:

N/A

Transfer:

Send Byte

Factory Value:

N/A

Description/Notes:

See Section 11.2 of the PMBus Specification Part II.

The MAX15303 includes three banks of nonvolatile (flash memory) storage for most “writable”

PMBus command values, referred to as the USER, DEFAULT, and MAXIM stores. These stores are fully

independent, but identical in structure.

The DEFAULT store is intended to function as a backup of an original equipment manufacturer (OEM)

preferred device configuration. OEMs should save identical configurations to the USER store and the

DEFAULT store, such that the USER store can be refreshed from the DEFAULT store if needed.

The contents of the DEFAULT store are never loaded into working memory unless the

RESTORE_DEFAULT_ALL command is sent.

In general, when the STORE_DEFAULT_ALL command is sent, the existing contents of the DEFAULT

store are erased, and the contents of the working PMBus memory (volatile RAM) are written into the

DEFAULT store. There are exceptions to this behavior, as follows:

OPERATION The OPERATION command is not stored to prevent unintentional

enabling/disabling of the output.

COMP_MODEL The working memory COMP_MODEL data is only stored if the

command has been edited (as recorded by STRAP_DISABLE).

MANUF_CONF The manufacturer flags for password command locking are stored

independently in nonvolatile memory for security.

MANUF_PASSWD The manufacturer security password is always volatile for obvious

reasons.

USER_CONF The user flags for password command locking are stored

independently in nonvolatile memory for security.

USER_PASSWD The user security password is always volatile for obvious reasons.

DEADTIME_GCTRL This command is used to initiate a partial internal edit of the

nonvolatile “Config Page” special-purpose memory bank.

Wait at least 450ms for execution after sending the STORE_DEFAULT_ALL command before sending

additional PMBus commands.