SL3ICS3001 datasheet(13/54 Pages) NXP

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SL3ICS3001_072831

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Product data sheet

COMPANY PUBLIC

Rev. 3.1 — 9 July 2012

072831

13 of 54

NXP Semiconductors

SL3ICS3001

UCODE HSL

6. If only one tag transmits and the ID is received correctly, the base station shall send

the DATA_READ command with the ID. If the DATA_READ command is received

correctly, then that tag moves to the DATA_EXCHANGE state and will transmit its

data. The base station shall sends SUCCESS. All tags in the ID state decrement

COUNT.

7. If only one tag has a count of ‘1’ and transmits, step 5 or 6 repeats. If more than one

tag transmits, step 2 repeats. (Possibility 3)

8. If only one tag transmits and the ID is received with an error, the base station shall

send the RESEND command. If the ID is received correctly, step 5 repeats. If the ID is

received again some variable number of times (this number can be set based on the

level of error handling desired for the system), it is assumed that more than one tag is

transmitting, and step 2 repeats. (Possibility 4)

8.6 Data exchange sequences

8.6.1 Forward link

Every command starts with a command header consisting of PREAMBLE_DETECT,

PREAMBLE and START DELIMITER. In this document, the appearance of these

sequences is given in NRZ format. A NRZ ‘1’ means maximum field strength and NRZ ‘0’

means lower or even zero field (see also Section 9.3). Compared to the Manchester

coded data, these sequences are given in halfbits.

All other transmitted data will be defined Manchester coded. This means that the digital

data will be defined by a falling or rising transition in the middle of the bit. Furthermore,

this means that a Manchester coded bit can be defined by two halfbits of a NRZ code.

The forward link consists of the following sequences:

• PREAMBLE_DETECT

no transition allowed during this time

• PREAMBLE

tag calibrates onto forward data rate

• START DELIMITER (STDEL)

tag verifies its calibration

• COMMAND (CMD)

• Address + Byte Mask + Data

only if required by the command

• CRC - 16

16 check bits, calculated from COMMAND + Address + Byte Mask + Data

• WAIT

only if COMMAND was a WRITE, to power the tag during EEPROM write

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