MRF24XA_15 Datasheet, PDF (114/258 Pages) Microchip Technology – Low-Power, 2.4 GHz ISM-Band IEEE 802.15.4™ RF

MRF24XA
FIGURE 4-11:
FRAME RECEPTION IN PACKET MODE (TRXMODE = 00)
Frame received over the Medium
Frame loaded to buffer for debug
RXSFDIF 1
by device
BUF1RXPP 1
BUF2RXPP 1
BUF2 selected
BUF1 selected
BUF2 selected
Yes
duplicate?
No
RXOVFIF 1
Exit with failure.
Packet discarded.
Earlier packet kept.
(RXBUFFUL = 1)
Figure 4-13
RXIDENTIF 1
Acknowledge must
be sent for duplicated
frames if AckReq = 1.
1
RXBUFFUL?
0
LENTGH and MAC frame
written into buffer
RSV appending
Acknowledge
sending
is always
bypassed in
debug
MHR parsing
Fail
Parsable?
Pass
FCS-check RXFILTER
FRMIF 1
Rejected?
Yes (discard)
RXFLTIF 1
No (accepted)
RXIDENTIF 1 if
duplicate
No
ACK Required?
Yes
Auto ACK-sending
AckReq = 0 OR
AUTOACKEN = 0 OR
debug (BUF1RXPP or
BUF2RXPP)
Figure 5-15
RXIDENTIF
0
Security Material
Retrieval support
RXBUFFUL 1
RXIF 1
Exit with success
(RXBUFFUL = 1)
1
Exit with failure
Packet discarded
(RXBUFFUL = 0)
Software reads the buffer content, may
decide on proceeding to security processing
( Figure 5-16 ); finally, frees up the buffer
by clearing RXBUFFUL.
DS70005023C-page 114
Preliminary
 2015 Microchip Technology Inc.