CC113LRGPR.B datasheet(29/87 Pages) TI2

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0,1,..........,88,....................255,0,........,88,..................,255,0,........,88,.......................,255,0, ......

Internal byte counter in packet handler counts from 0 to 255 and then starts at 0 again

Infinite packet length enabled

600 bytes received

Fixed packet length mode

enabled when less than 256

bytes remains of packet

Length field received. PKTLEN set to

mode(600, 256) = 88

CC113L

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SWRS108B – MAY 2011 – REVISED JUNE 2014

When for example a 600-byte packet is to be received, the MCU should do the following (see

Figure 5-7).

•

Set PKTCTRL0.LENGTH_CONFIG=2.

•

Receive enough bytes to interpret the length field

•

Program the PKTLEN register to mod(600, 256) = 88.

•

Receive at least 345 bytes (600 - 255)

•

Set PKTCTRL0.LENGTH_CONFIG=0.

•

The reception ends when the packet counter reaches 88. A total of 600 bytes have been received.

Figure 5-7. Packet Length > 255

5.10.2 Packet Filtering

CC113L supports three different types of packet-filtering; address filtering, maximum length filtering, and

CRC filtering.

5.10.2.1 Address Filtering

Setting PKTLEN.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 PKTCTRL0 register and the 0x00 broadcast address when PKTLEN.ADR_CHK=10 or both

the 0x00 and 0xFF broadcast addresses when PKTLEN.ADR_CHK=11. If the received address matches a

valid address, the packet is received and written into the RX FIFO. If the address match fails, the packet is

discarded and receive mode restarted (regardless of the MCSM1.RXOFF_MODE setting).

If the received address matches a valid address when using infinite packet length mode and address

filtering is enabled, 0xFF will be written into the RX FIFO followed by the address byte and then the

payload data.

5.10.2.2 Maximum Length Filtering

In variable packet length mode, PKTCTRL0.LENGTH_CONFIG=1, the PKTLEN.PACKET_LENGTH

value

than

this,

the

packet

discarded

and

receive

mode

restarted

(regardless

the

MCSM1.RXOFF_MODE setting).

5.10.2.3 CRC Filtering

The filtering of a packet when CRC check fails is enabled by setting PKTLEN.CRC_AUTOFLUSH=1. The

CRC auto flush function will flush the entire RX FIFO if the CRC check fails. After auto flushing the RX

FIFO, the next state depends on the MCSM1.RXOFF_MODE setting.

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