CC2520_11 Datasheet, PDF (119/133 Pages) Texas Instruments – 2.4 GHZ IEEE 802.15.4/ZIGBEE RF TRANSCEIVER

CC2520 DATASHEET
2.4 GHZ IEEE 802.15.4/ZIGBEE® RF TRANSCEIVER
SWRS068 – DECEMBER 2007
FSMSTAT1, A 0x033, R 0x00, Radio status register
Bit
Bit mnemonic
no.
7
FIFO
6
FIFOP
5
SFD
4
CCA
3
SAMPLED_CCA
2
LOCK_STATUS
1
TX_ACTIVE
0
RX_ACTIVE
Reset
value
0
0
0
0
0
0
0
0
Mode
R
R
R
R
R
R
R
R
Description
FIFO is high whenever there is data in the RXFIFO. Low during
RXFIFO overflow
FIFOP is set high when there are more than FIFOP_THR bytes of
data in the RXFIFO that has passed frame filtering.
FIFOP is set high when there is at least one complete frame in the
RXFIFO. FIFOP is set low again when a byte is read from the
RXFIFO and this leaves less than FIFOP_THR bytes in the FIFO.
FIFOP is high during RXFIFO overflow
In TX:
0: When a complete frame with SFD has been sent or no SFD has
been sent
1: SFD has been sent
In RX:
0: When a complete frame has been received or no SFD has been
received
1: SFD has been received
Clear channel assessment. Dependent on CCA_MODE settings.
See CCACTRL1 for details.
Contains a sampled value of the CCA. The value is updated
whenever a SSAMPLECCA or STXONCCA strobe is issued
'1' when PLL is in lock, otherwise '0'.
Status signal, active when FFCTRL is in one of the transmit states
Status signal, active when FFCTRL is in one of the receive states
FIFOPCTRL, A 0x034, R 0x40, FIFOP threshold
Bit
Bit mnemonic
no.
7
RESERVED
6:0
FIFOP_THR[6:0]
Reset
value
0
0x40
Mode
R0
R/W
Description
Read as zero
Threshold used when generating FIFOP signal
FSMCTRL, A 0x035, R 0x01, FSM options
Bit
Bit mnemonic
no.
7:2
RESERVED
1
SLOTTED_ACK
0
RX2RX_TIME_OFF
Reset
value
0x00
0
1
Mode
R0
R/W
R/W
Description
Read as zero
Controls timing of transmission of acknowledge frames
0: The acknowledge frame will be sent 12 symbol periods after
the end of the received frame which requests the aknowledge.
1: The acknowledge frame will be sent at the first backoff slot
boundary more than 12 symbol periods after the end of the
received frame which requests the aknowledge
Defines whether or not a 12 symbol time out should be used after
frame reception has ended.
0 - No time out.
1 - 12 symbol period time out.
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