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[v1-10] 2018-Apr-25

AS39513 − Detailed Description

Request Command Structure

The Request Command Structure from the Reader is:

where SOF is the ISO15693 start-of-frame, the Flags are the

protocol control flags described below, the command code

determines which command is being requested, UID is the

unique identifier, parameters and data are zero or more bytes

depending on the command, the CRC is the error check code,

which is calculated in accordance with ISO15693-3 and EOF is

the ISO15693 end-of-frame. The UID can be present or not

present depending on the Flags settings.

For the custom commands (command codes 0xA0 through

0xDF), the command code field will be followed immediately

by an IC manufacturing code, which for the AS39513 is 0x36 for

legacy reasons.

Flags

There are two types of request command flags used in

ISO15693: inventory flags (abbreviated IFLAGS) and

non-inventory flags (abbreviated NFLAGS). Their formats are as

follows.

The Inventory Flags are:

where:

SUBCAR – Sub-carrier selection.

0 = Use a single sub-carrier frequency in the response.

1 = Use two sub-carriers in the response.

DRATE – Data rate selection.

0 = Use low data rate.

1 = Use high data rate.

AFI – AFI field usage. Only 0 (no AFI field) is supported in the

AS39513.

NBSLOTS – Number of anti-collision slots.

0 = 16 slots.

SOF

Flags

Command Code

UID

Parameters

Data

CRC

EOF

8 bits

64 bits

n*8 bits

m*8 bits

16 bits

Bit

432

IFLAGS

OPTION

NBSLOTS

AFI

DRATE

SUBCAR

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