CC1110-RTR1 datasheet(167/203 Pages) TI

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CC1110

CC1110 PRELIMINARY Datasheet (Rev. 1.01) SWRS033A

Page 167 of 202

environments,

transient

and

time-varying

phenomena will produce occasional errors

even in otherwise good reception conditions.

FEC will mask such errors and, combined with

interleaving of the coded data, even correct

relatively long periods of faulty reception (burst

errors).

The FEC scheme adopted for

CC1110 is

convolutional coding, in which n bits are

generated based on k input bits and the m

most recent input bits, forming a code stream

able to withstand a certain number of bit errors

between each coding state (the m-bit window).

The convolutional coder is a rate 1/2 code with

a constraint length of m=4. The coder codes

one input bit and produces two output bits;

hence, the effective data rate is halved.

15.11.1 Interleaving

Data received through real radio channels will

often

experience

burst

errors

due

interference and time-varying signal strengths.

In order to increase the robustness to errors

spanning multiple bits, interleaving is used

when FEC is enabled. After de-interleaving, a

continuous span of errors in the received

stream will become single errors spread apart.

CC1110 employs matrix interleaving, which is

illustrated

Figure

37.

The

on-chip

interleaving and de-interleaving buffers are 4 x

4 matrices. In the transmitter, the data bits are

written into the rows of the matrix, whereas the

bit sequence to be transmitted is read from the

columns of the matrix and fed to the rate ½

convolutional

coder.

Conversely,

the

receiver, the received symbols are written into

the columns of the matrix, whereas the data

passed onto the convolutional decoder is read

from the rows of the matrix.

When FEC and interleaving is used, the

amount of data transmitted over the air must

be a multiple of the size of the interleaver

buffer (two bytes). In addition, at least one

extra byte is required for trellis termination.

The

packet

control

hardware

therefore

automatically inserts one or two extra bytes at

the end of the packet, so that the total length

of the data to be interleaved is an even

number. Note that these extra bytes are

invisible to the user, as they are removed

before the received packet enters the RFD

data register.

Due to the implementation of the FEC and

interleaver, the data to be interleaved must be

at least two bytes. One byte long fixed length

packets

without

CRC

therefore

not

supported when FEC/interleaving is enabled.

Receiver

Transmitter

1) Storing coded

data

2) Transmitting

interleaved data

4) Passing on data

to decoder

3) Receiving

interleaved data

Data

Figure 37: General principle of matrix interleaving

15.12 Radio Control

CC1110 has a built-in radio state machine that is

used to switch between different operational

states (modes) of the radio. The change of

state is done by using command strobes given

in Table 42.

A simplified state diagram, together with

typical usage and current consumption, is

shown in Figure 33 on page 155. The

complete radio control state diagram is shown

in Figure 38. The state names and numbering

shown in the figure, refer to the state value

returned by the MARCSTATE status register.

This functionality is primarily for test and

debug purposes.

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