SRI4K datasheet(29/45 Pages) STMICROELECTRONICS

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SRI4K

SRI4K commands

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8.3

Slot_marker(SN) command

Command code = x6h

The SRI4K must be in Inventory state to interpret the Slot_marker(SN) command.

The Slot_marker byte code is divided into two parts:

●

b3 to b0: 4-bit command code

with fixed value 6.

●

b7 to b4: 4 bits known as the Slot_number (SN). They assume a value between 1 and

15. The value 0 is reserved by the Pcall16() command.

On receiving the Slot_marker() command, the SRI4K compares its Chip_slot_number value

with the Slot_number value given in the command code. If they match, the SRI4K returns its

Chip_ID value. If not, the SRI4K does not send any response.

The Slot_marker() command, used together with the Pcall16() command, allows the reader

to search for all the Chip_IDs when there are more than one SRI4K device in Inventory state

present in the reader field range.

Figure 29.

Slot_marker request format

Request parameter:

●

x: Slot number

Figure 30.

Slot_marker response format

Response parameters:

●

Chip_ID of the SRI4K

Figure 31.

Slot_marker frame exchange between reader and SRI4K

SOF

Slot_marker

CRCL

CRCH

EOF

AI07675b

X6h

8 bits

SOF

Chip_ID

CRCL

CRCH

EOF

AI07671

8 bits

SOF

X6h

CRCL

CRCH EOF

AI10886

Reader

SRI4K

SOF

Chip_ID

CRCL CRCH

EOF

<-t0-><-t1->

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