CC2400-RTR1 datasheet(32/84 Pages) TI2

32 / 84 page

CC2400

SWRS042A

Page 32 of 83

If 8/10 coding is selected when using the

packet mode support, it should be noted

that the preamble and the sync words are

not encoded.

24.2 Data encoding in un-buffered

mode

When data buffering is not used, but the

DIO/DCLK interface, the

CC2400 can be

configured for two different data formats:

Synchronous NRZ mode. In transmit

mode

CC2400 provides the data clock at

DCLK, and DIO is used as data input.

Data is clocked into

CC2400 at the rising

edge of DCLK. The data is modulated at

RF without encoding. In receive mode

CC2400 does the synchronization and

provides received data clock at DCLK and

data at DIO. The data should be clocked

into the interfacing circuit at the rising

edge of DCLK. See Figure 12.

Synchronous Manchester encoded mode.

In transmit mode

CC2400 provides the data

clock at DCLK, and DIO is used as data

input. Data is clocked into

CC2400 at the

rising edge of DCLK and should be in NRZ

format. The data is modulated at RF with

Manchester code. The encoding is done

CC2400. In this mode the effective bit

rate is half the baud rate due to the

coding. This limits the maximum bit rate to

500 kbps. In receive mode

CC2400 does

the synchronization and provides received

data clock at DCLK and data at DIO.

CC2400 does the decoding and NRZ data

is presented at DIO. The data should be

clocked into the interfacing circuit at the

rising edge of DCLK. See Figure 13.

DCLK

DIO

“RF”

Clock provided by

CC2400

FSK modulating signal (NRZ),

internal in CC2400

Data provided by microcontroller (NRZ)

Transmitter side:

Clock provided by

CC2400

Demodulated signal (NRZ),

internal in CC2400

Data provided by CC2400 (NRZ)

Receiver side:

“RF”

DCLK

DIO

Figure 12. Synchronous NRZ mode

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