MB89R119B datasheet(22/46 Pages) RAMXEED

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MB89R119B

DS411-00002-4v0-E

12. Timing definitions

(1)Transponder waiting time before transmitting its response after reception of an EOF from the reader/writer

: t1_a

After detection of an EOF signal sent from the reader/writer, each transponder must wait for a certain time

(t1_a) before sending a response to the reader/writer. t1_a begins at the rising edge of the EOF pulse, and

it is defined as follows.The minimum value is 4320/fc (318.6 s), the nominal value is 4352/fc (320.9 s),

and the maximum value is 4384/fc (323.3 s).

If the transponder detects a carrier modulation for ASK 100% or 10% within the time t1_a, it shall reset its

t1_a timer and wait for further time t1_a before starting to transmit its response to a reader/writer.

MB89R119B defines the same waiting time t1_a for Write commands as follows, although the maximum

value is not defined in ISO/IEC 15693-3 and ISO/IEC 18000-3 (Mode 1) . The minimum value is 4320/fc

(318.6 s), the nominal value is 4352/fc (320.9 s), and the maximum value is 4384/fc (323.3 s).Timing

conditions for Write command in which the option_flag is “1”, has optional field are defined in the command

descriptions.

(2) Transponder modulation ignore time after reception of an EOF from the reader/writer : tmit

After detection of an EOF signal sent from the reader/writer, MB89R119B shall ignore any received 10%,

modulation during tmit. tmit starts from the detection of the rising edge of the EOF, and the minimum value

is defined as 4384/fc (323.3 s)  tnrt. tnrt stands for the response time of MB89R119B.

(3) Reader/writer waiting time before sending a subsequent request : t2_a

When the reader/writer has received a response from the transponder to a previous request other than

Inventory and Quiet command, it shall wait a time t2_a before sending a subsequent request. The minimum

value of t2_a is 309.2 s. It is defined in ISO/IEC 15693-3 and ISO/IEC 18000-3 (Mode 1) .

When the reader/writer has sent Stay Quiet command or Kill command, which causes no response from the

transponder, or MB89R119B does not return any response, MB89R119B can receive a command in

309.2 s from the detection of the rising edge of the EOF.

(4) Reader/writer waiting time before sending a request(switching to the next slot) during an Inventory process

: t2inv

During Inventory process, the reader/writer sends an EOF to switch to the next slot. In this case, the waiting

time is defined as follows depending on whether transponders return responses.

- Waiting time applied when the reader/writer has received one or more responses : t2invwr

It is defined in ISO/IEC 15693-3 and ISO/IEC 18000-3 (Mode 1) that when the reader/writer has received

one or more responses, the reader/writer must wait until responses from the transponders have been

completed (that is, the reader/writer receives an EOF or tnrt passes). After that, the reader/writer must

wait as additional t2_a, and then send a 10% or 100% ASK modulated EOF to switch to the next slot.

- Waiting time applied for when the reader/writer has not received any responses : t3_a

When the reader/writer has not received any responses from the transponders, the reader/writer must

wait until t3_a passes before sending an EOF signal. In this case, t3_a starts from the rising edge of the

last sent EOF. The minimum value of t3_a is defined as shown in the following table.

(a) If the reader/writer sends a ASK10% modulated EOF,

the minimum value of t3_a (ASK 10%) is ’4384/fc (323.3 s) + tnrt’.

(b) If the reader/writer sends a ASK100% modulated EOF,

the minimum value of t3_a (ASK 100%) is ’4384/fc (323.3 s) + tsof’.

tnrt : The nominal response time of transponder

tsof : The time for transponder to transmit a SOF to the reader/writer

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