MIC3001GML Micrel Inc, MIC3001GML Datasheet - Page 37

• Manufacturer Part Number: MIC3001GML
• Description: IC FOM MANAGEMENT W/CALIBR 24MLF
• Manufacturer: Micrel Inc
• Type: Transceiverr

Specifications of MIC3001GML

• Protocol: SDHj Sonet
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 24-MLF®, QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of Drivers/receivers: -
• Other names: 576-1753-5; MIC3001GML

Micrel, Inc.
Acknowledge Polling
The MIC3001’s non-volatile memory cannot be accessed
during the internal write process. To allow for maximum
speed bulk writes, the MIC3001 supports acknowledge
polling. The MIC3001 will not acknowledge serial bus
transactions while internal writes are in progress. The
host may therefore monitor for the end of the write
process
acknowledgement.
Write Protection and Data Security
OEM Password
A password is required to access the OEM areas of the
MIC3001, specifically the non-volatile memory, look-up
tables, and registers at serial addresses A4
four-byte field, OEMPWSET, at serial address A6
used for setting the OEM password. The OEM password
is set by writing OEMPWSET with the new value. The
password comparison is performed following the write to
the MSB of the OEMPW, address 7B
A2
byte burst-write sequence to address 78
this will result in the MSB being written last. The new
password will not take effect until after a power-on reset
occurs or a warm reset is performed using the RST bit in
OEMCFG0. This allows the new password to be verified
before it takes effect.
The corresponding four-byte field for password entry,
OEMPW, is located at serial address A2
therefore always visible to the host system. OEMPW is
compared to the four-byte OEMPWSET field at serial
address A6
the OEM areas of the MIC3001 non-volatile memory at
serial addresses A4
zeroes, no password security will exist. The value in
OEMPW will be ignored. This helps prevent a deliberately
unsecured MIC3001 from being inadvertently locked.
Once a valid password is entered, the MIC3001 OEM
August 2004
h
. Therefore, this byte must be written last! A four-
h
by
. If the two fields match, access is allowed to
periodically
h
and A6
h
. If OEMPWSET is all
checking
h
Figure 25. Four-Byte Page_White Protocol
h
at serial address
may be used as
h
. This field is
h
and A6
for
h
h
. A
an
is
areas will be accessible. The OEM areas may be re-
secured by writing an incorrect password value at OEMPW,
e.g., all zeroes. In all cases OEMPW must be written LSB
first through MSB last. The OEM areas will be inaccessible
following the final write operation to OEMPW’s LSB. The
OEMPW field is reset to all zeros at power on. Any values
written to these locations will be readable by the host
regardless of the locked/unlocked status of the device. If
OEMPWSET is set to zero (00000000
remain unlocked regardless of the contents of the OEMPW
field. This is the factory default security setting.
NOTE: A valid OEM password allows access to the OEM
and user areas of the chip, i.e., the entire memory map,
regardless of any user password that may be in place. Once
the OEM areas are locked, the user password can provide
access and write protection for the user areas.
User Password
A password is required to access the USER areas of the
MIC3001, specifically the non-volatile memory at serial
addresses A0
serial address A2
USRPWSET is compared to the USRPW field at serial
address A2
the USER areas of the MIC3001 non-volatile memory at
serial addresses A0
by writing USRPWSET with the new value. The new
password will not take effect until after a power-on reset
occurs or a warm reset is performed using the RST bit in
OEMCFG0. This allows the new password to be verified
before it takes effect.
NOTE: A valid OEM password allows access to the OEM
and user areas of the chip, i.e., the entire memory map,
regardless of any user password that may be in place. Once
the OEM areas are locked, the user password can provide
access and write protection for the user areas. If a valid
OEM password is in place, the user password will have no
effect.
37
h
. If the two fields match, access is allowed to
h
and A2
h
is used for setting the USER password.
h
[e-mail]
and A2
h
. A one-byte field, USRPWSET at
h
. The USER password is set
h
), the MIC3001 will
or [phone]
M9999-082404-A
MIC3001