CC1110-RTR1 datasheet(164/203 Pages) TI

164 / 203 page

CC1110

CC1110 PRELIMINARY Datasheet (Rev. 1.01) SWRS033A

Page 164 of 202

15.8.3 Packet filtering in Receive Mode

CC1110 supports two different packet-filtering

criteria: address filtering and maximum length

filtering.

15.8.3.1 Address Filtering

Setting PKTCTRL1.ADR_CHK to any other

value than zero enables the packet address

filter. The packet handler engine will compare

the destination address byte in the packet with

the programmed node address in the ADDR

PKTCTRL1.ADR_CHK=10 or both 0x00 and

0xFF

broadcast

addresses

when

PKTCTRL1.ADR_CHK=11. If the received

address matches a valid address, the packet is

received and written into the RFD register. If

the address match fails, the packet is

discarded

and

receive

mode

restarted

(regardless of the MCSM1.RXOFF_MODE

setting).

15.8.3.2 Maximum Length Filtering

In the variable packet length mode the

PKTLEN.PACKET_LENGTH register value is

used to set the maximum allowed packet

length. If the received length byte has a larger

value than this, the packet is discarded and

receive mode restarted (regardless of the

MCSM1.RXOFF_MODE

setting).

the

received length byte has a larger value than

this, the packet is discarded and receive mode

restarted

(regardless

the

MCSM1.RXOFF_MODE setting).

15.8.4 Packet Handling in Transmit Mode

The payload that is to be transmitted must be

written into RFD. The first byte written must be

the length byte when variable packet length is

enabled. The length byte has a value equal to

the payload of the packet (including the

optional address byte). If fixed packet length is

enabled, then the first byte written to RFD is

interpreted as the destination address, if this

feature is enabled in the device that receives

the packet.

The modulator will first send the programmed

number of preamble bytes. If data is written to

RFD, the modulator will send the two-byte

(optionally 4-byte) sync word and then the

payload written to RFD. If CRC is enabled, the

checksum is calculated over all the data pulled

from RFD and the result is sent as two extra

bytes at the end of the payload data.

If whitening is enabled, the length byte,

payload data and the two CRC bytes will be

whitened. This is done before the optional

FEC/Interleaver stage. Whitening is enabled

by setting PKTCTRL0.WHITE_DATA=1.

If FEC/Interleaving is enabled, the length byte,

payload data and the two CRC bytes will be

scrambled by the interleaver, and FEC

encoded before being modulated.

15.8.5 Packet Handling in Receive Mode

In receive mode, the demodulator and packet

handler will search for a valid preamble and

the sync word. When found, the demodulator

has obtained both bit and byte synchronism

and will receive the first payload byte.

If FEC/Interleaving is enabled, the FEC

decoder will start to decode the first payload

byte. The interleaver will de-scramble the bits

before any other processing is done to the

data.

If whitening is enabled, the data will be de-

whitened at this stage.

When variable packet length is enabled, the

first byte is the length byte. The packet handler

stores this value as the packet length and

receives the number of bytes indicated by the

length byte. If fixed packet length is used, the

packet handler will accept the programmed

number of bytes.

Next, the packet handler optionally checks the

address and only continues the reception if the

address matches. If automatic CRC check is

enabled, the packet handler computes CRC

and matches it with the appended CRC

checksum.

At the end of the payload, the packet handler

will optionally write two extra packet status

bytes that contain CRC status, link quality

indication and RSSI value.

15.9 Modulation Formats

CC1110 supports amplitude, frequency and

phase shift modulation formats. The desired

modulation

format

set

the

MDMCFG2.MOD_FORMAT register.

Optionally, the data stream can be Manchester

coded by the modulator and decoded by the

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