MRF24XA_15 Datasheet, PDF (108/258 Pages) Microchip Technology – Low-Power, 2.4 GHz ISM-Band IEEE 802.15.4™ RF

MRF24XA
4.9 Frame Transmission in Packet Mode
FIGURE 4-9:
TRANSMITTER PROCESSING IN PACKET MODE
TXST 1
Select BUF1
BUF1TXPP 1
Select BUF1
BUF2TXPP 1
Select BUF2
In place
processing
test
Figure 5-7
Figure 5-9
TX MHR parsing
Parsable?
Pass
Tx Security
Processing
Fail (invalid format)
if required
FRMIF 1
FCS appending
if CRCSZ = 1
TXSZIF
1
Size run over 127 bytes: TXSZIF = 1
0
TXST
1
0 (In-place test only)
TXIF 1
TXRETCCNT 0
Reset retransmission count
CSMA-CA
AckReq = 1
Figure 4-12
No
1
TXCSMAIF
Medium access failure: TXCSMAIF = 1
0
ACK required?
No (Sending complete)
TXIF 1
Yes
Acknowledge
Reception
ACK received?
Yes (success)
TXIF 1
No
Increment TXRETCCNT
TXIF 1
TXRETCCNT >=
TXRETMCNT
Yes (failure)
Max. retransmissions reached
BUF1TXPP 0
BUF2TXPP 0
TXST 0
TXBUFEMPTY 1
Interrupt Service
DS70005023C-page 108
Preliminary
 2015 Microchip Technology Inc.