Texas Instruments CC2541EMK User Manual

Frametransmittedsuccessfully
Incompleteornoframetransmission
Writeaframetothe
TXbufferusing:
- TXBUF
- TXBUFCP
-Memoryaccess
- A combinationof
thesemethods
Thiscanbedone
before,after,orin
parallelwiththe TX
strobe.
STXONCCASTXON
SSAMPLECCA
No
TXcompletes?
TX_FRM_DONE
TXstarted?
Yes
Nexttime...
Why?
Toretransmitor
transmita
differentframe...
TX_OVERFLOW
TXbufferoverfilled
Errorcondition
Nexttime...
SFLUSHTXSFLUSHTX
Errorcondition
(leftsideoftheflow
diagramshouldbe
ignoredbecausethe
TXbufferiscorrupted.)
TX_UNDERFLOW
SFLUSHTX
Writethenext
frametothe TX
buffer
(before,after,orin
parallelwiththe
TXstrobe)
Writethenew
frametothe TX
buffer
before,after,orin
parallelwiththe
TXstrobe)
Writethenext
frametothe TX
buffer
before,after,orin
parallelwiththe
TXstrobe)
Writethenew
frametothe TX
buffer
(before,after,orin
parallelwiththe
TXstrobe)
Success?
Yes
(SAMPLED_CCA =1)
Yes
(SAMPLED_CCA =1)
No
(SAMPLED_CCA =0)
No
(SAMPLED_CCA =0)
NoCSMA-CA UnslottedCSMA-CA SlottedCSMA-CA
Betweentwotransmissions,therecanbemultipleotheractivitiessuchasframereception,RXFIFOaccess,andacknowledgmenttransmission(usingSACK,
SACKPEND,or AUTOACK),oridleperiods(randombackoffs). Thishasnosideeffectsonthestateofthe TXbuffer.
TheplacementoftheSFLUSHTXstrobeinthediagramshowsthelatestpointintimewherethisstrobecanbeexecuted.Iffewerspecialcasesisdesired,itis
alwayspossibletousetheSFLUSHTXstrobeandthenloadorreload TXBUFwiththenextframetobetransmitted.
Restartfromthe
topofthediagram
Ifanythingis
writtentothe TX
buffer,itis
appendedtothe
currentdata.
Databuffering
Restartfromthe
topofthediagram
Donotwrite
anythingtothe TX
buffer
Restartfromthe
topofthediagram
Restartfromthe
topofthediagram
Restartfromthe
topofthediagram
Restartfromthe
topofthediagram
TXisabortedby
SRXON,
STXONorSRFOFF
TIME
Toretransmitthe
currentframe...
Totransmita
differentframe...
To(re)transmit
whatis
currentlyin
the TXbuffer...
Totransmita
differentframe...
Toretransmitor
transmita
differentframe...
F0035-01
www.ti.com Transmit Mode
Figure 23-6. TX Flow
231
SWRU191C–April 2009–Revised January 2012 CC253x Radio
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Texas Instruments CC2541EMK Specifications

General

Brand	Texas Instruments
Model	CC2541EMK
Category	Microcontrollers
Language	English