CC1110-RTR1 datasheet(163/203 Pages) TI

163 / 203 page

CC1110

CC1110 PRELIMINARY Datasheet (Rev. 1.01) SWRS033A

Page 163 of 202

MDMCFG2.SYNC_MODE=3 or 7. The sync

word will then be repeated twice.

CC1110 supports both fixed packet length

protocols and variable length protocols.

The maximum packet length is 255 bytes.

For longer packets, infinite packet length

mode must be used.

Fixed packet length mode is selected by

setting

PKTCTRL0.LENGTH_CONFIG=0.

The desired packet length is set by the

PKTLEN register. The packet length is

defined as the payload data, excluding the

length byte and the optional automatic

CRC. In variable length mode, the PKTLEN

packet length allowed in RX. Any packet

received with a length byte with a value

greater than PKTLEN will be discarded.

Note that the minimum packet length

supported (excluding the optional length

byte and CRC) is one byte of payload

data.

With PKTCTRL0.LENGTH_CONFIG=2, the

packet length is set to infinite and

transmission and reception will continue

until turned off manually. The infinite mode

can be turned off while a packet is being

transmitted or received. As described in

the next section, this can be used to

support packet formats with different

length

configuration

than

natively

supported by

CC1110.

15.8.2.1 Arbitrary length field

configuration

The

fixed

length

field

can

reprogrammed

during

receive

and

transmit. This opens the possibility to have

a different length field configuration than

supported for variable length packets. At

the start of reception, the packet length is

set to a large value. The CPU reads out

enough bytes to interpret the length field in

the packet. Then the PKTLEN value is set

according to this value. The end of packet

will occur when the byte counter in the

packet handler is equal to the PKTLEN

program the correct length, before the

internal counter reaches the packet length.

By utilizing the infinite packet length

option, arbitrary packet length is available.

At the start of the packet, the infinite mode

must be active. When less than 256 bytes

remains of the packet, the CPU sets the

PKTLEN register to mod(length, 256),

disables

infinite

packet

length

and

activates fixed length packets. When the

internal byte counter reaches the PKTLEN

value, the transmission or reception ends.

Automatic CRC appending/checking can

be used (by setting PKTCTRL0.CRC_EN to

1).

When for example a 454-byte packet is to

be transmitted, the CPU does the

following:

•

Set

PKTCTRL0.LENGTH_CONFIG=2

(10).

•

Pre-program the PKTLEN register to

mod(454,256)=198.

•

Transmit at least 198 bytes, for

example by filling the 64-byte TX FIFO

four times (256 bytes transmitted).

•

Set

PKTCTRL0.LENGTH_CONFIG=0

(00).

The transmission ends when the packet

counter

reaches

198.

total

256+198=454 bytes are transmitted.

Preamble bits

(1010...1010)

Data field

Optional CRC-16 calculation

Optionally FEC encoded/decoded

8 x n bits

16/32 bits

bits

8 x n bits

16 bits

Optional data whitening

Legend:

Inserted automatically in TX,

processed and removed in RX.

Optional user-provided fields processed in TX,

processed but not removed in RX.

Unprocessed user data (apart from FEC

and/or whitening)

Figure 36: Packet Format

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