MN63Y1208 Datasheet, PDF (90/120 Pages) Panasonic Semiconductor – Built-in 4-Kbit FeRAM non-volatile memory with fast write and low power consumption

Chapter 7 Tunnel Mode
7.3.3 Timeout
In tunnel mode command processing for communication between host and RFID, a timeout processing is
applied if the host sends no response to QUERY and ANSWER commands.
Figure 7-3 shows the wait time for commands in tunnel mode.
Subsequent section describes the wait time for QUERY and ANSWER commands.
Wait time for QUERY command
Wait time for ANSWER command
RF-I/F
Tunnel mode
command
Response to
tunnel mode
NIRQ
Slave
reception
Slave transmission
QUERY
command
Response to
QUERY
ANSWER
command
Response to
ANSWER
Figure 7-3 Wait Time for Commands
Note: In timeout measurement processing for I2C, the start of command is detected at the start of ACK
transmission to a slave address input, not start condition.
7.3.3.1 Wait Time for QUERY Command
The time sequence (QRTRY = 1) for timeout of waiting for QUERY command (no response from the host) is
shown in Figure 7-4 . The measurement of timeout starts when the IRQ state of NIRQ pin changes to low from
high.
A timeout time is the longer of QWT setting time or I2CWT setting time.
No response from the host
RF-I/F
Tunnel mode
command
QWT setting time
Response with an error
(No response from the host)
Response to
tunnel mode
NIRQ
Slave reception
Slave transmission
Figure 7-4 Timeout of Waiting for QUERY Command (No Response from the Host)
Next, the time sequence when the RFID receives a command other than QUERY from the host while it waits
for a QUERY command is shown in Figure 7-5 .Note that the timeout measurement time does not include the
time from serial communication command issue to the response to the command.
For more information, see Section 9.3 Flow Chart in Tunnel Mode.
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