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CC2520 Datasheet(PDF) 69 Page - Texas Instruments |
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CC2520 Datasheet(HTML) 69 Page - Texas Instruments |
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69 / 134 page  CC2520 DATASHEET 2.4 GHZ IEEE 802.15.4/ZIGBEE® RF TRANSCEIVER SWRS068 – DECEMBER 2007 WWW.TI.COM 69 19.4 TX Flow Diagram Figure 17 summarizes the previous sections in a flow diagram: 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. STXONCCA STXON SSAMPLECCA No No (SAMPLED_CCA = 0) Yes (SAMPLED_CCA = 1) TX completes? TX_FRM_DONE TX started? Yes Next time... To retransmit the current frame... Why? To retransmit or transmit a different frame... TX is aborted by SRXON, STXON or SRFOFF TX_OVERFLOW TX buffer overfilled Error condition To transmit a different frame... Next time... To (re)transmit what is currently in the TX buffer... To transmit a different frame... SFLUSHTX SFLUSHTX Error condition (left side of the flow diagram should be ignored since the TX buffer is corrupted) TX_UNDERFLOW To retransmit or transmit a different frame... 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) No (SAMPLED_CCA = 0) Success? Yes (SAMPLED_CCA = 1) 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 will have 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 will be 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 Figure 17: TX flow |
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