LRI512 데이터 시트보기 (PDF) - STMicroelectronics

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LRI512

Memory TAG IC 512 bit High Endurance EEPROM 13.56MHz, ISO 15693 Standard Compliant with E.A.S.

STMicroelectronics 

LRI512

REQUEST FORMAT

The Request consists of

– SOF

– Flags

– A Command Code

– Parameters and Data

– CRC

– EOF

Table 10. General Request Format

S

O

F

Request

Flags

Command

Code

Parameters

Data

E

CRC O

F

Request Flags

In a Request, the flags field specifies the actions to

be performed by the LRI512, and whether corre-

sponding fields are present or not.

It consists of eight bits.

The bit 3 (Inventory_flag) of the request flag de-

fines the content of the 4 MSBs (bits 5 to 8).

When bit 3 is reset (0), bits 5 to 8 define the

LRI512 selection criteria.

When bit 3 is set (1), bits 5 to 8 define the LRI512

Inventory parameters.

Table 11. Request Flags 1 to 4 Definition

Bit 1

Sub-carrier

flag

0

1

A single sub-carrier frequency

shall be used by the LRI512

Two sub-carriers shall be used

by the LRI512

Bit 2

Data_rate

flag

0 Low data rate is used

1 High data rate is used

Bit 3

Inventory

flag

0

Flags 5 to 8 meaning are

according to Table 12

1

Flags 5 to 8 meaning are

according to Table 13

Protocol

Bit 4 Extension 0 No Protocol format extension

flag

Note: 1. Sub-carrier_flag refers to the LRI512-to-VCD communi-

cation.

2. Data_rate_flag refers to the LRI512-to-VCD communica-

tion

Table 12. Request Flags 5 to 8 when Bit 3 = 0

Request shall be executed by

0 any LRI512 according to the

Bit 5 Select flag

setting of Address_flag

1

Request shall be executed only

by LRI512 in Selected State

Bit 6

Address

flag

Request is not addressed. UID

0 field is not present. It shall be

executed by all LRI512.

Request is addressed. UID field

is present. It shall be executed

1 only by the LRI512 whose UID

matches the UID specified in

the Request.

Bit 7 Option flag 0

Bit 8 RFU 0

Note: if the Select_flag is set to 1, the Address_flag shall be set to

0 and the UID field shall not be present in the Request.

Table 13. Request Flags 5 to 8 when Bit 3 = 1

Bit 5 AFI flag

0 AFI field is not present

1 AFI field is present

0 16 slots

Bit 6 Nb_slots flag

1 1 slot

Bit 7 Option flag 0

Bit 8

RFU

0

20/54

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