SL3ICS3001 datasheet(8/54 Pages) NXP

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SL3ICS3001_072831

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Product data sheet

COMPANY PUBLIC

Rev. 3.1 — 9 July 2012

072831

8 of 54

NXP Semiconductors

SL3ICS3001

UCODE HSL

State transition description

• Power-On

– state change when interrogator field is turned on

• Power-Off

– state change when interrogator field is turned off

• Select

state change due to selection of tag by GROUP_SELECT commands

• Unselect

– state change due to deselection of tag by GROUP_UNSELECT commands

• Data_Read

– state change due to first read access in collision arbitration process

• Read

– state change due to read access independent of collision arbitration process

• Initialize

– state change due to deselection of all tags by the INITIALIZE command

As the state machine only supports 3 active states (READY, ID and DATA_EXCHANGE),

only 3 opportunities of the tag status exist when the tag comes into the ready state after

the power-off state.

1. The tag is new in this environment or was out of the field for a long while. In this case

the tag should stay in the ready state until a new collision arbitration loop is initiated by

a GROUP_SELECT command.

2. The tag has been participating in a collision arbitration and lost power through field

nulls or just came out of the operating range. In this case, the tag has lost one or more

collision arbitration commands and should therefore no longer participate in the active

collision arbitration round. It should stay in the ready state until a new collision

arbitration loop is initiated by a GROUP_SELECT command.

3. The tag had been selected already and was powered-down due to field nulls or short

time being out of the operating range. In this case the tag no longer needs to be

considered in the collision arbitration loops of this interrogator. Interrogators using the

GROUP_SELECT_FLAG and GROUP_UNSELECT_ FLAG commands appropriately

do not need to handle tags with DE_SB set and therefore limit the number of tags for

the next collision arbitration loop to only those tags that have not been handled

before.

By use of above mechanism each field null shorter than tDE_SB, which is at least several

seconds does not require a tag to be handled more than once in the collision arbitration. In

general the use of the DE_SB bit improves the number of tags identified within a certain

time especially for large tag numbers when field nulls exist.

The exact transition between these states is specified in Table 5.

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