MB89R112 datasheet(37/49 Pages) RAMXEED

37 / 49 page

MB89R112

DS411-00004-3v0-E

3-6. Read Lock Block Command

On receiving the Read Lock Block command, the transponder locks (read disable) permanently the data

stored in one specified single-block. The transponder performs verification after writing and returns an error

code if the writing has failed.

If the Option_flag (bit 7) is “0”, the transponder shall return its response when it has completed the lock

operation starting after “t1nom (320.9 s) + a multiple of 4096/fc (302.1s)” with total tolerance of  32/fc

(2.4 s) and latest within 20 ms. If it is “1”,the transponder shall wait for the reception of an EOF from the

reader/writer, and upon such reception still return its response (However, if an EOF is not sent within 38 ms,

the time-out occurs and the transponder can receive another command).

Once the Read Lock Block command has been received, data in the locked block cannot read by the Read

Single Block command. On the other hand, if the locked block is accessed as part of the selected blocks by

the Read Multiple Blocks command, the data of the locked block is indicated as “00H” among the batch of

the data.



Request

[Request from the reader/writer to the transponder]



Response

[Response from the transponder to the reader/writer]

(1) When Error_flag set

(2) When Error_flag not set

SOF

Flag

Command

(Read Lock Block)

IC manufacturer

code

UID

(Addressed mode)

Block

number

CRC

EOF

8 bits

8 bits (“D9H”)

8 bits (“08H”)

64 bits

8 bits

16 bits

SOF

Flag

Error code

CRC

EOF

8 bits (“01H”)

8 bits

16 bits

SOF

Flag

CRC

EOF

8 bits (“00H”)

16 bits

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