SPIRIT1 datasheet(29/94 Pages) STMICROELECTRONICS

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SPIRIT1

Operating modes

Doc ID 022758 Rev 3

29/94

After TX completion, the possible destinations are:

●

TX, if the persistent-TX option is enabled in the PROTOCOL configuration registers

●

PROTOCOL, if some protocol option (e.g. automatic re-transmission) is enabled

●

READY, if TX is completed and no protocol option is in progress.

Similarly, when RX is activated by the RX command, the state machine goes into RX state

and remains there until the packet is successfully received or the RX timeout expires. In

case of direct mode RX, the RX stops when the RXFIFO overflow condition is reached or

the SABORT command is applied. After RX completion, the possible destinations are:

●

RX, if the persistent-RX option is enabled in the PROTOCOL configuration registers

●

PROTOCOL, if some protocol option (e.g. automatic acknowledgement) is enabled

●

READY, if RX is completed and the LDCR mode is not active

●

SLEEP, if RX is completed and the LDCR mode is active.

The SABORT command can always be used in TX or RX state to break any deadlock

condition and the subsequent destination depends on SPIRIT1 programming according to

the description above.

Commands are used in the SPIRIT1 to change the operating mode, to enable/disable

functions, and so on. A command is sent on the SPI interface and may be followed by any

other SPI access without pulling CSn high.

The complete list of commands is reported in Table 18. Note that the command code is the

second byte to be sent on the MOSI pin (the first byte must be 0x80).

Table 18.

Commands list

Command

code

Command name

Execution state

Description

0x60

READY

Start to transmit

0x61

READY

Start to receive

0x62

READY

STANDBY, SLEEP,

LOCK

Go to READY

0x63

STANDBY

READY

Go to STANDBY

0x64

SLEEP

READY

Go to SLEEP

0x65

LOCKRX

READY

Go to LOCK state by using the RX configuration of the

synthesizer

0x66

LOCKTX

READY

Go to LOCK state by using the TX configuration of the

synthesizer

0x67

SABORT

TX, RX

Exit from TX or RX states and go to READY state

0x68

LDC_RELOAD

All

Reload the LDC timer with the value stored in the

LDC_PRESCALER/COUNTER registers

0x69

SEQUENCE_UPDA

All

Reload the packet sequence counter with the value

stored in the PROTOCOL[2] register.

0x6A

AES Enc

All

Start the encryption routine

0x6B

AES Key

All

Start the procedure to compute the key for decryption

0x6C

AES Dec

All

Start decryption using the current key

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