MRF49XAT-I-ST Datasheet, PDF (93/102 Pages) Microchip Technology – ISM Band Sub-GHz RF Transceiver

MRF49XA
APPENDIX A: READ SEQUENCE
AND PACKET
STRUCTURES
Figure 1 shows the STSREG read sequence with FIFO
read as an example.
FIGURE A-1:
STSREG READ SEQUENCE
CS
SCK
SDI
SDO
0
1
2
3
4
5
6
7
8
9
10
11 12 ₁₃ 14 ₁₅
16
17
Command
(1)(2)(3)
TXRXFIFO
Interrupt Bits Out
(1,2,3)
POR
TXOWR WUTI
XOF
NT
LCE
XINT
LBTD
FIFO
EM
(Latched) (Latched) (Latched) (Latched) (Latched)
(1,2,3)
ATRS
SI
DQDO
Status Bits Out
CLKRL AFCCT OFFSV ^{OFFSB OFFSB OFFSB OFFSB}
<3>
<2>
<1>
<0>
(Sign)
FIFO Out
FO FO+1 FO+2
Note: 1. Applicable when the RXCEN bit is set using the PMCREG.
2. Applicable when the RXCEN bit is cleared using the PMCREG.
3. These bits are internally latched and the other bits are only multiplexed out.
TABLE A-1: RECOMMENDED FIFO PACKET STRUCTURES
Length
Preamble
Synchronous Word/Network ID Payload
CRC
Minimum Length
4-8 bits (0x0A or 0x05)
0xD4 (programmable)
Recommended Length 8-12 bits (e.g., 0xAA or 0x55) 0x2DD4 (D4 is programmable)
—
4-bit-1 byte
—
2 bytes
© 2009-2011 Microchip Technology Inc.
Preliminary
DS70590C-page 93