Rainbow Electronics RF22 - Manual (Page 26)

RF22
Version: 0.1 Date: 12/23/2008
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6.4.2. Packet Handler Enabled
When the packet handler is enabled, all the fields of the packet structure need to be configured. If multiple packets are
desired to be stored in the FIFO, then there are options available for the different fields that will be stored into the FIFO.
Figure 19 demonstrates the options and settings available when multiple packets are enabled. Figure 20 demonstrates
the operation of fixed packet length and correct/incorrect packets.
Register
Data
Register
Data
FIFO
Data
Header(s)
Length
rx_multi_pk_en = 1
H
Data
rx_multi_pk_en = 0
txhdlen = 0 txhdlen > 0
fixpklen fixpklen
0 1 0 1
Data Data Data Data
L L
H
RX FIFO Contents: Transmission:
Figure19. Multiple Packets in RX Packet Handler
Data
L
H
Data
L
H
Data
L
H
Data
L
H
Write
Pointer
Write
Pointer
RX FIFO Addr.
63
0
RX FIFO Addr.
63
0
Data
L
H
Write
Pointer
RX FIFO Addr.
63
0
Data
L
H
Data
L
H
Write
Pointer
RX FIFO Addr.
63
0
CRC
error
Data
L
H
Data
L
H
Write
Pointer
RX FIFO Addr.
63
0
Initial state PK 1 OK PK 2 OK PK 3
ERROR
PK 4 OK
Figure20. Multiple Packets in RX with CRC or Header Error
Table13. RX Packet Handler Configuration
Data mod
es
dtm
od
[1:0
]
enpacrx Direct Da
ta a
nd
CLK I
O
Preamble &
Syn
c
word
de
tecti
o
n
Header H
andl
in
g
Data St
orage
in
FIF
O
CRC Ha
ndli
n
g
Manche
ster a
n
d
Wh
it
en
in
g
FIFO_PH 10 1 option set option set option option
FIFO 10 0 option set — set — option
Direct 0X X set set — — Manchester optional for sync-detection