LRI64 datasheet(15/38 Pages) STMICROELECTRONICS

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LRI64

FLAGS AND ERROR CODES

Request Flags

In a Request, the 8-bit Flags Field specifies the ac-

tions to be performed by the LRI64, and whether

corresponding fields are present or not.

Flag bit 3 (the Inventory_flag) defines the way the

four most significant flag bits (5 to 8) are used.

When bit 3 is reset (0), bits 5 to 8 define the LRI64

selection criteria. When bit 3 is set (1), bits 5 to 8

define the LRI64 Inventory parameters.

Table 3. Request Flags 1 to 4

Note: 1. If the value of the Request Flag is a non authorized value,

the LRI64 does not execute the command, and does not

respond to the request.

Table 4. Request Flags 5 to 8 (when Bit 3 = 0)

Note: 1. Only bit 6 (Address flag) can be configured for the LRI64.

All others bits (5, 7 and 8) must be reset to 0.

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

Note: 1. Bits 7 and 8 must be reset to 0.

Response Flags

In a Response, the 8-bit Flags Field indicates how

actions have been performed by the LRI64, and

whether corresponding fields are present or not.

Table 6. Response Flags 1 to 8

Response Error Code

If the Error Flag is set by the LRI64 in the Re-

sponse, the Error Code Field is present and pro-

vides information about the error that occurred.

Table 7. shows the one error code that is support-

ed by the LRI64.

Table 7. Response Error Code

Bit

Name

Value 1

Description

Sub-

carrier

Flag

Single sub-carrier

frequency mode.

(Option 1 is not supported)

Data_rate

Flag

High data rate mode.

(Option 0 is not supported)

Inventory

Flag

Flags 5 to 8 meaning are

according to Table 4.

Flags 5 to 8 meaning are

according to Table 5.

Protocol

Extension

Flag

No Protocol format

extension. Must be set to 0.

(Option 1 is not supported)

Bit

Name

Value 1

Description

Select

Flag

No selection mode.

Must be set to 0.

(Option 1 is not supported)

Address

Flag

Non addressed mode.

The UID field is not present

in the request. All LRI64

shall answer to the request.

Addressed mode.

The UID field is present in

the request. Only the LRI64

that matches the UID

answers the request.

Option

Flag 1

No option. Must be set to 0.

(Option 1 is not supported)

RFU 1

No option. Must be set to 0.

(Option 1 is not supported)

Bit

Name

Value 1

Description

AFI Flag

AFI field is not present

AFI field is present

Nb_slots

Flag

16 slots

11 slot

Option

Flag

No option. Must be set to 0.

(Option 1 is not supported)

8RFU

No option. Must be set to 0.

(Option 1 is not supported)

Bit

Name

Value

Description

Error Flag

No error

Error detected. Error

code is in the "Error"

field.

2RFU

3RFU

4RFU

5RFU

6RFU

7RFU

8RFU

Error

Code

Meaning

0Fh

Error with no specific information given

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