LRI512 datasheet(20/54 Pages) STMICROELECTRONICS

20 / 54 page

LRI512

20/54

REQUEST FORMAT

The Request consists of

–SOF

– Flags

– A Command Code

– Parameters and Data

– CRC

–EOF

Table 10. General Request Format

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

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

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

Request

Flags

Command

Code

Parameters

Data

CRC

Bit 1

Sub-carrier

flag

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

Low data rate is used

High data rate is used

Bit 3

Inventory

flag

Flags 5 to 8 meaning are

according to Table 12

Flags 5 to 8 meaning are

according to Table 13

Bit 4

Protocol

Extension

flag

No Protocol format extension

Bit 5

Select flag

Request shall be executed by

any LRI512 according to the

setting of Address_flag

Request shall be executed only

by LRI512 in Selected State

Bit 6

Address

flag

Request is not addressed. UID

field is not present. It shall be

executed by all LRI512.

Request is addressed. UID field

is present. It shall be executed

only by the LRI512 whose UID

matches the UID specified in

the Request.

Bit 7 Option flag

Bit 8

RFU

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

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