Maxim Integrated MAX15303 PMBus Command Set - Manual (Page 42)

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: 0 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.