AS3900 datasheet(36/59 Pages) AMSCO

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AS3900

Data Sheet - Detail ed Description

8.8 Data Frames

8.8.1 Frame Structure for Timer Controlled Packet Mode

This Frame structure is always used during Pairing and Binding Modes. The maximum data length is 24 bytes and has to be reflected in the data

length value given in the data length byte. ID, Cycle time and Random Generator Pointer are user defined.

Table 30. Frame Structure

Preamble

Cycle-time/ RGN-pointer

data length

data

CRC

Table 31. Frame Structure Description

Name

Length (bytes)

Value (Hex)

The frame structure for all other transmission modes (streaming mode, not timer controlled modes etc.) are different and are described in the

appropriate application notes.

8.8.2 Frame Structure for ACKNOWLEDGE (ACK)

After data was received successfully (correct ID and no CRC error) ACK will be send.

Table 32. Frame Structure

Preamble

ACK

If the received ID can not be found in ID list REG 0x08 to

0x1F and the reception was successful (CRC is O.K.) the

interrupt dat_rtx is set, but no ACK is sent to the client. The

MCU reads the ID from the id_new register REG 0x34 to

0x36. If the ID is confirmed (by MCU) then the MCU writes the

new ID via SDI to the ID list REG 0x08 to 0x1F.

After the data is transmitted the Client enters the receive mode for

the dedicated time (datarate x 3byte). If ACK was not received the

interrupt ack_rtx is not generated. The Client transmit again data via

the command TRANSMIT. The procedure is repeated at Step 2.

MSB

──► data transmission direction ──►

LSB

16 bits

24 bits

4 + 4bits

8 bits

data from TX register maximum 192

bits

16 bits

Preamble

2 bytes

0x0017

not accessible

3 bytes

user defined

(PPROM programmable)

Main Register Bank

REG 0x08, 0x09, 0x0A

Cycle time

4 bits

user defined; taken from the register in

the client chip

Shadow Register Bank,

SREG 0x0C<7:5>

RNG pointer

4 bits

user defined; taken from the register in

the client chip

Shadow Register Bank,

SREG 0x0C<4:0>

Data length

5 bits

user defined

Main Bank

REG 0x37<4:0>

Status Bits

3 bits

user defined

Main Bank

REG 0x37<7:5>

Payload data

0 – 24 bytes

user defined

REG 0x38 (MSB) to REG 0x51 (LSB)

CRC (CRC16)

2 bytes

calculated from payload data

Not accessible

16 bits

8bits

Table 29. Scan / Reconnect / Pair Clients

Step

Master

Client

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