ZL8802 Datasheet, PDF (88/91 Pages) Intersil Corporation – Dual Channel/Dual Phase PMBus™ ChargeMode™ Control DC/DC Digital Controller

ZL8802
Write
Attempted
Y
Y
Y
Write
Prohibited
N
Always
Writeable
?
N
Read
Only
?
N
Security
Level == 3
?
N
Default
UNPROTECT
== 0
?
N
Security
Level == 2
?
N
User
UNPROTECT
== 0
?
N
Security
Level == 1
?
Y
Y
Y
Y
Write
Allowed
FIGURE 12. ALGORITHM USED TO DETERMINE WHEN A COMMAND IS WRITEABLE
Security Level 3 – Module Vendor
Level 3 is intended primarily for use by module vendors to protect device configurations in the default store. Clearing a UNPROTECT bit
in the default store implies that a command is writeable only at Level 3 and above. The device’s security level is raised to Level 3 by
writing the private password value previously stored in the default store. To be effective, the module vendor must clear the UNPROTECT
bit corresponding to the STORE_DEFAULT_ALL and RESTORE_DEFAULT commands. Otherwise, Level 3 protection is ineffective since
the entire store could be replaced by the user, including the enclosed private password.
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FN8760.1
December 11, 2015