ST25DV02K-W1 datasheet(32/74 Pages) STMICROELECTRONICS

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Table 48. Definition of request flags 1 to 4

Bit No

Flag

Level

Description

Bit 1

Subcarrier_flag (1)

A single subcarrier frequency is used by the ST25DV02K-W1/2

Two subcarriers are used by the ST25DV02K-W1/2

Bit 2

Data_rate_flag (2)

Low data rate is used

High data rate is used

Bit 3

Inventory_flag

The meaning of flags 5 to 8 is described in Table 49. Request flags 5 to 8 when

inventory_flag, Bit 3 = 0

The meaning of flags 5 to 8 is described in Table 50. Request flags 5 to 8 when

inventory_flag, Bit 3 = 1

Bit 4

Protocol_extension_flag

No Protocol format extension

Protocol format extension. Reserved for future use.

1. Subcarrier_flag refers to the ST25DV02K-W1/2-to-VCD communication.

2. Data_rate_flag refers to the ST25DV02K-W1/2-to-VCD communication.

Table 49. Request flags 5 to 8 when inventory_flag, Bit 3 = 0

Bit nb

Flag

Level

Description

Bit 5

Select flag (1)

The request is executed by any ST25DV02K-W1/2 according to the setting of Address_flag

The request is executed only by the ST25DV02K-W1/2 in Selected state

Bit 6

Address flag

The request is not addressed. UID field is not present. The request is executed by all

ST25DV02K-W1/2s.

The request is addressed. UID field is present. The request is executed only by the

ST25DV02K-W1/2 whose UID matches the UID specified in the request.

Bit 7

Option flag

Option not activated.

Option activated.

Bit 8

RFU

1. If the Select_flag is set to 1, the Address_flag is set to 0 and the UID field is not present in the request.

Table 50. Request flags 5 to 8 when inventory_flag, Bit 3 = 1

Bit nb

Flag

Level

Description

Bit 5

AFI flag

AFI field is not present

AFI field is present

Bit 6

Nb_slots flag

16 slots

1 slot

Bit 7

Option flag

Bit 8

RFU

6.2.6

Response format

The response consists of:

•

an SOF,

•

flags,

•

parameters and data,

•

a CRC,

•

an EOF.

ST25DV02K-W1 ST25DV02K-W2

RF protocol

DS12114 - Rev 6

page 32/74

ST25DV02K-W1 Datasheet(PDF) 32 Page - STMicroelectronics

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