MN63Y1208 Datasheet, PDF (36/120 Pages) Panasonic Semiconductor – Built-in 4-Kbit FeRAM non-volatile memory with fast write and low power consumption

Chapter 4 RF Communication Mode
4.2.5.3 Response Time Descriptor
The response time descriptor is used to specify the maximum wait time until the RFID sends a response after
reader/writer sends a command, and is included in the response to the REQ command. Figure 4-7 illustrates
the response time descriptor's format. In hardware, D0, D1, and D7 bytes are set to FFh and D2 to D4 bytes
are set to 00h. The response time calculation parameters D5 and D6 bytes are the values of the system area.
Table 4-4 shows the response time calculation parameter and corresponding command.
Response time descriptor
D0 D1 D2 D3 D4
0xFF 0xFF 0x00 0x00 0x00
D5 D6
PMM
D7
0xFF
Response time calculation parameter
Figure 4-7 Response Time Descriptor Format
Table 4-4 Response Time Calculation Parameter and Corresponding Command
Pesponse time calculation parameter
D5
D6
Command
READ
WRITE
Figure 4-8 shows the response time calculation parameter's format.
msb
lsb
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Exponent E
Real number B
Real number A
Figure 4-8 Response Time Calculation Parameter Format
The response time is calculated by the following formula:
Response time = T × [ (B + 1) × n + (A + 1) ] × 4^E
T: 256 × 16/fc (approx. 0.302 ms)
n: No. of blocks or No. of files of command parameter.
4.2.5.4 Anticollision
JISX6319-4 uses the time slot method for anti-collision (prevention of collision). This RFID always responds
according to the first slot.
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