User's Manual

Table Of Contents

Using the TRF7970A EVM With PC GUI

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2.3.16 TI Custom Commands

The TRF7970A supports the two custom commands that are outlined in the ISO/IEC 15693 standard and

defined by Texas Instruments. The format outlined in the standard for custom VICC commands is shown

in Table 7. These commands are only supported by TI "Plus" silicon based transponders, which can be

identified by part numbers containing RI-xxx-112A.

Table 7. Custom Commands Request Format

Custom

Manufacturer

SOF Request Flags Command Custom Request Parameters CRC16 EOF

Code

1 byte Custom defined by IC 2 bytes

1 byte 1 byte

(0x07 = TI) manufacturer (handled by TRF7970A)

2.3.16.1 Write Two Blocks (Command Code 0xA2)

When receiving the Write 2 Block Command, the transponder programs the requested blocks with the

data contained in the request and reports the success of the operation in the response.

The addressed pair of blocks must contain one even and one odd block (for example, block numbers 2

and 3 or block numbers 6 and 7). The start block must have the even address (for example, number2,

number4, or number6). If the odd address is used in the start block, the transponder does not execute the

write operation and returns the error code 0xA1.

If one or both of the addressed blocks are locked, the transponder does not execute the write operation

and returns the error code 0xA2.

The transmitted LSB block data are written to the LSB of the even addressed block (bytes 0-3) and the

MSB transmitted data to the odd addressed block (bytes 4-7).

2.3.16.2 Lock Two Blocks (Command Code 0xA3)

When receiving the Lock_2_Block Command, the Transponder shall lock the addressed blocks and report

the success of the operation in the Response.

The addressed pair of blocks must contain one even and one odd block (for example, block numbers 2

and 3 or block numbers 6 and 7). The start block must have the even address (for example, number2,

number4, or number6). If the odd address is used in the start block, the Transponder does not execute the

Lock Block operation and returns the error code 0xA1.

If one or both of the addressed blocks are locked, the VICC returns the error code 0xA2.

TRF7970A Evaluation Module (EVM) SLOU321– August 2011

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