CC1110-RTR1 datasheet(169/203 Pages) TI

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CC1110

CC1110 PRELIMINARY Datasheet (Rev. 1.01) SWRS033A

Page 169 of 202

•

Calibrate when going from IDLE to

either RX or TX (or FSTXON)

•

Calibrate when going from either RX

or TX to IDLE

•

Calibrate every fourth time when going

from either RX or TX to IDLE

The calibration takes a constant number of

XOSC cycles (see Table 48 for timing details).

When RX is activated, the chip will remain in

receive mode until the RX termination timer

expires (see section 15.12.3) or a packet has

been

successfully

received.

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 15.10. After a packet is

successfully received the radio controller will

then go to the state indicated by the

MCSM1.RXOFF_MODE setting. The possible

states 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.

The CPU can change the state from RX to TX

and vice versa by using the command strobes.

If the radio controller is currently in transmit

and the SRX strobe is written, 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 issued, the

“TX if clear channel” function will be used. If

the channel is not clear, the chip will remain in

RX. The MCSM1.CCA_MODE setting controls

the conditions for clear channel assessment.

See section 15.10.4 on page 166 for details.

The SIDLE command strobe can always be

issued to force the radio controller to go to the

IDLE state.

15.12.2 Timing

The radio controller controls most timing in

CC1110, such as synthesizer calibration, PLL

lock and RT/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. Table 48 shows timing in

crystal clock cycles for key state transitions.

Power on time and XOSC start-up times are

variable, but within the limits stated in Table 8.

Description

XOSC

periods

26MHz

crystal

Idle to RX, no calibration

2298

88.4µs

Idle to RX, with calibration

~21037

809µs

Idle to TX/FSTXON, no calibration

2298

88.4µs

Idle to TX/FSTXON, with calibration

~21037

809µs

TX to RX switch

560

21.5µs

RX to TX switch

250

9.6µs

RX or TX to IDLE, no calibration

0.1µs

RX or TX to IDLE, with calibration

~18739

721µs

Manual calibration

~18739

721µs

Table 48: State transition timing

15.12.3 RX Termination Timer

CC1110 has optional functions for automatic

termination of RX after a programmable time.

The main use for this functionality is wake-on-

radio (WOR), but it may be useful for other

applications. The termination timer starts when

enabling the demodulator. The timeout is

programmable

with

the MCSM2.RX_TIME

setting. When the timer expires, the radio

controller will check the condition for staying in

RX; if the condition is not met, RX will

terminate. After the timeout, the condition will

be checked continuously.

The programmable conditions are:

•

MCSM2.RX_TIME_QUAL=0:

Continue

receive if sync word has been found

•

MCSM2.RX_TIME_QUAL=1:

Continue

receive if sync word has been found or

preamble quality is above threshold (PQT)

If the system can expect the transmission to

have started when enabling the receiver, the

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