SRTAG512L datasheet(40/51 Pages) STMICROELECTRONICS

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RF command sets

SRTAG512L

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DocID027439 Rev 2

The FSDI field codes the FSD that defines the maximum size that an RF host is able to

receive. Table 49 gives the conversion from FDSI to FSD.

The DID field defines the value of the addressed SRTAG512L.

The FSCI codes the FSC which stands for the maximum frame size that the SRTAG512L is

able to receive. The SRTAG512L is able to receive up to 64 bytes of command. If the RF

host sends a command with more than 64 bytes, the SRTAG512L will not be able to treat

the command and will not reply.

The FWI which stands for the Frame Waiting time Integer codes the FWT. This time

corresponds to the maximum duration while an RF host shall send before sending the next

command.

Table 48. RATS command

Name

INS

Param

CRC

Byte field

0xE0

1 byte

2 bytes

Bit field

b7-b4

b3-b0

Instruction code

FSDI

DID (0

≤ DID ≤ 14)

2 CRC bytes

Table 49. Conversion from FDSI to FSD

FSDI

0x0

0x1

0x2

0x3

0x4

0x5

0x6

0x7

0x8

0x9h-

0xE

0xF

FSD

128

256

RFU

256

Table 50. ATS response

Name

TA(1)

TB(1)

TC(1)

CRC

Byte field

0x05

0x75

0x80

0x60

0x02

2 bytes

Bit field

b8-b5

b4-b1

Length of the ATS

response

FSCI = 5 => FSC = 64 bytes

The maximum ascending data rate is 106 kbps

The maximum descending data rate is 106 kbps

FWI field (FWI = 6 => FWT = 19.2 ms)

SFGI field (SFGI = 0 => SFGT =302 µs)

The DID is supported

2 CRC bytes

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