CC2430-RTR1-F64Z datasheet(176/234 Pages) TI

176 / 234 page

CC2430

CC2430 PRELIMINARY Data Sheet (rev. 1.03) SWRS036A

Page 176 of 232

r10

r11

r12

r13

r14

r15

Data

input

(LSB

first)

Figure 48:

CC2430 Frame Check Sequence (FCS) hardware implementation [1]

MPDU

Length byte

MPDU

n-2

RSSI

(signed)

CRC / Corr

Bit number

CRC

Correlation value (unsigned)

Data in RXFIFO

Figure 49: Data in RXFIFO when MDMCTRL0L.AUTOCRC is set

14.17 RF Data Buffering

CC2430 can be configured for different

transmit and receive modes, as set in the

MDMCTRL1L.TX_MODE

and

MDMCTRL1L.RX_MODE

control

bits.

Buffered mode (mode 0) will be used for

normal operation of

CC2430, while other

modes are available for test purposes.

14.17.1 Buffered transmit mode

In buffered transmit mode (TX_MODE 0),

the 128 byte TXFIFO, located in

CC2430

RAM, is used to buffer data before

transmission. A synchronization header is

automatically inserted before the length

field during transmission. The length field

must always be the first byte written to the

transmit buffer for all frames.

Writing one or multiple bytes to the

TXFIFO is described in the FIFO access

section on page 169. A DMA transfer can

be configured to write transmit data to the

TXFIFO.

Transmission is enabled by issuing a

STXON or STXONCCA command strobe.

See the Radio control state machine

section on page 179 for an illustration of

how the transmit command strobes affect

the state of

CC2430. The STXONCCA strobe

is ignored if the channel is busy. See

section 14.25 on page 182 for details on

CCA.

The preamble sequence is started 12

symbol

periods

after

the

transmit

command strobe. After the programmable

start

frame

delimiter

has

been

transmitted, data is fetched from the

TXFIFO.

The TXFIFO can only contain one data

frame at a given time.

After complete transmission of a data

frame, the TXFIFO is automatically refilled

with the last transmitted frame. Issuing a

new STXON or STXONCCA command

strobe will then cause

CC2430 to retransmit

the last frame.

Writing to the TXFIFO after a frame has

been transmitted will cause the TXFIFO to

be automatically flushed before the new

byte is written. The only exception is if a

TXFIFO underflow has occurred, when a

SFLUSHTX command strobe is required.

14.17.2 Buffered receive mode

In buffered receive mode (RX_MODE 0),

the 128 byte RXFIFO, located in

CC2430

RAM, is used to buffer data received by

the demodulator. Accessing data in the

RXFIFO is described in the FIFO access

section on page 169.

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