MRF24XA_15 Datasheet, PDF (193/258 Pages) Microchip Technology – Low-Power, 2.4 GHz ISM-Band IEEE 802.15.4™ RF

MRF24XA
7.4 Streaming
The Streaming feature provides the maximum
throughput between two nodes. In this mode, the two
packet buffers are used to transmit/receive packets by
alternating between the two.
The main advantage of this mode is that MCU can
perform buffer RW while the packet is being transmitted
over the air.
Auto-ACK and Auto-Retransmission are unavailable in
this mode. Additionally, CSMA-CA operation is skipped
to provide the maximum throughput.
7.4.1 TX
After the initial negotiation (channel, power, security
key, and so on), the TX node sets the TRXMODE<1:0>
register to 2’b10. The MCU shall write the packets to
address 0x200. The switching is handled internally.
Note that MCU must write MRF24XA if the
TXBUFFEMPTY flag is set. To maximize throughput,
“WRITE and set TXST” SPI framing format is
recommended.
Note that TXRDBUF, BUSWRBUF, and TXBUFEMPTY
signals are the output on the GPIO pins with
GPIOMODE = 1010 settings.
Handling buffer empty flag by an additional interrupt is
recommended to avoid constant polling over SPI.
FIGURE 7-3:
STREAMING MODE TX TIMELINE
 2015 Microchip Technology Inc.
Preliminary
DS70005023C-page 193