SRIX4K datasheet(21/47 Pages) STMICROELECTRONICS

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SRIX4K

SRIX4K states

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SRIX4K states

The SRIX4K can be switched into different states. Depending on the current state of the

SRIX4K, its logic will only answer to specific commands. These states are mainly used

during the anticollision sequence, to identify and to access the SRIX4K in a very short time.

The SRIX4K provides 6 different states, as described in the following paragraphs and in

Figure 20.

6.1

Power-off state

The SRIX4K is in Power-off state when the electromagnetic field around the tag is not strong

enough. In this state, the SRIX4K does not respond to any command.

6.2

Ready state

When the electromagnetic field is strong enough, the SRIX4K enters the Ready state. After

power-up, the Chip_ID is initialized with a random value. The whole logic is reset and

remains in this state until an Initiate() command is issued. Any other command will be

ignored by the SRIX4K.

6.3

Inventory state

The SRIX4K switches from the Ready to the Inventory state after an Initiate() command has

been issued. In Inventory state, the SRIX4K will respond to any anticollision commands:

Initiate(), Pcall16() and Slot_marker(), and then remain in the Inventory state. It will switch to

the Selected state after a Select(Chip_ID) command is issued, if the Chip_ID in the

command matches its own. If not, it will remain in Inventory state.

6.4

Selected state

In Selected state, the SRIX4K is active and responds to all Read_block(), Write_block(),

Authenticate() and Get_UID() commands. When an SRIX4K has entered the Selected state,

it no longer responds to anticollision commands. So that the reader can access another tag,

the SRIX4K can be switched to the Deselected state by sending a Select(Chip_ID2) with a

Chip_ID that does not match its own, or it can be placed in Deactivated state by issuing a

Completion() command. Only one SRIX4K can be in Selected state at a time.

6.5

Deselected state

Once the SRIX4K is in Deselected state, only a Select(Chip_ID) command with a Chip_ID

matching its own can switch it back to Selected state. All other commands are ignored.

6.6

Deactivated state

When in this state, the SRIX4K can only be turned off. All commands are ignored.

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