AS39513 datasheet(80/108 Pages) AMSCO

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[v1-10] 2018-Apr-25

AS39513 − Detailed Description

Set Access Command

Set Access Command Request:

Set Access Command Reply:

The set access command opens a specific type of EEPROM area

to be available for writing. Three of the four types of area access

can be set with this command: System, Application, and

Measurement. (The Factory areas can only be accessed through

the SPI, except for limited and specific commands like Set

Password and Lock Block.) The access level field, Level, has the

format below. Note, it is only necessary to first send a Set Access

command before a Write command if the password is non zero

for a particular EEPROM area.

Access Level Field

where:

ALEV[1:0] – Access level.

0 = Not allowed.

1 = System access level.

2 = Application access level.

3 = Measurement access level.

Each access level is independent, and only affects write

operations. If the set access command for a given level has the

correct 32-bit password, the access for writing to that level is

opened. The access remains open until the RF field is removed.

(The access will close with the loss of RF field even if the logic

is continuously powered by an external battery.)

If the set access command has an incorrect password, an

incorrect password error (error code 0xA0) is returned. The

default passwords for an unprogrammed device are

0x00000000.

The password values themselves are stored and EEPROM and

can be written with the Set Password command below.

SOF

Flags

Command

IC Mfg.

UID

Level

Password

CRC

EOF

NFLAGS

0xA0

0x36

64 bits

8 bits

4*8 bits

16 bits

SOF

Flags

CRC

EOF

RFLAGS

16 bits

Bit

765

432

Level

000

ALEV[1:0]

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