CC2510FX Datasheet, PDF (205/244 Pages) List of Unclassifed Manufacturers – True System-on-Chip with Low Power RF Transceiver and 8051 MCU

If the radio goes from TX or RX to IDLE by
issuing an SIDLE strobe, calibration will not be
performed. The calibration takes a constant
number of XOSC cycles (see Table 71 for
timing details).
When RX is activated, the chip will remain in
receive mode until a packet is successfully
received or the RX termination timer expires
(see Section 14.12.3). Note: The probability
that a false sync word is detected can be
reduced by using PQT, CS, maximum sync
word length, and sync word qualifier mode as
describe in Section 14.10.1. After a packet is
successfully received the radio controller will
then go to the state indicated by the
MCSM1.RXOFF_MODE setting. The possible
destinations are:
• IDLE
• FSTXON: Frequency synthesizer on
and ready at the TX frequency. Activate
TX with STX.
• TX: Start sending preambles
• RX: Start search for a new packet
Similarly, when TX is active the chip will
remain in the TX state until the current packet
has been successfully transmitted. Then the
state will change as indicated by the
MCSM1.TXOFF_MODE setting. The possible
destinations are the same as for RX.
It is possible to change the state from RX to
TX and vice versa by using the command
strobes. If the radio controller is currently in
C2510Fx / CC2511Fx
transmit and an SRX strobe is written to the
RFST register, the current transmission will be
ended and the transition to RX will be done.
If the radio controller is in RX when the STX or
SFSTXON command strobes are used and
MCSM1.CCA_MODE ≠ 00, the TX-if-CCA
function will be used. If the channel is not
clear, the chip will remain in RX. For more
details on clear channel assessment, see
Section 14.10.7 on Page 201.
The SIDLE command strobe can always be
used to force the radio controller to go to the
IDLE state.
14.12.2 Timing
The radio controller controls most timing in
CC2510Fx/CC2511Fx, such as synthesizer
calibration, PLL lock time and RX/TX
turnaround times. Timing from IDLE to RX and
IDLE to TX is constant, dependent on the auto
calibration setting. RX/TX and TX/RX
turnaround times are constant. The calibration
time is constant 18739 clock periods (f_Ref).
Table 71 shows the timing for key state
transitions.
Power on time and XOSC start-up times are
variable, but within the limits stated in Table 11
and Table 12
Note that in a frequency hopping spread
spectrum or a multi-channel protocol it is
possible to reduce the calibration time
significantly. This is explained in Section
14.17.2.
Description
Idle to RX, no calibration
Idle to RX, with calibration
Idle to TX/FSTXON, no
calibration
Idle to TX/FSTXON, with
calibration
TX to RX switch
RX to TX switch
RX or TX to IDLE, no calibration
RX or TX to IDLE, with calibration
Manual calibration
f_Ref Periods
2298
~21037
2298
~21037
560
250
2
~18739
~18739
Transition Time
f_Ref = 26 MHz
88.4 µs
f_Ref = 24 MHz
95.8 µs
809 µs
876.5 µs
88.4 µs
95.8 µs
809 µs
876.5 µs
21.5 µs
9.6 µs
0.1 µs
721 µs
721 µs
23.3 µs
10.4 µs
0.1 µs
780.8 µs
780.8 µs
Table 71: State Transition Timing
SWRS055D
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