HFA3860 Datasheet, PDF (26/40 Pages) Intersil Corporation – 11 Mbps Direct Sequence Spread Spectrum Baseband Processor

HFA3860
1.00E^-04
1.00E^-05
BER 1.0
BER 2.0
BER 5.5
BER 11
1.00E^-06
-50 -40 -30 -20 -10 0 10 20 30
CARRIER OFFSET AT 2.4GHZ (PPM)
FIGURE 18. BER vs CARRIER OFFSET
40 50
A Default Register Configuration
The registers in the HFA3860 are addressed with 6-bit numbers
where the lower 2 bits of an 8-bit hexadecimal address are left
as unused. This results in the addresses being in increments of
4 as shown in the table below. Table 11 shows the register
values for a default 802.11 configuration with various rate
configurations. The data is transmitted as either DBPSK,
DQPSK, BMBOK, or QMBOK depending on the configuration
chosen. It is recommended that you start with the simplest
configuration (DBPSK) for initial test and verification of the
device and/or the radio design. The user can later modify the
CR contents to reflect the system and the required
performance of each specific application.
CONFIGURATION
REGISTER
CR0
CR1
CR2
CR3
CR4
CR5
CR6
CR7
CR8
CR9
CR10
CR11
CR12
CR13
CR14
CR15
CR16
CR17
CR18
CR19
CR20
CR21
CR22
CR23
TABLE 11. CONTROL REGISTER VALUES FOR SINGLE ANTENNA ACQUISITION
NAME
TYPE
REGISTER
ADDRESS HEX 1/2/5.5/11 MBps
Part / Version Code
R
00
01
I/O polarity
R/W
04
00
TX & RX Control
R/W
08
14
A/D_CAL_POS Register
R/W
0C
02
A/D_CAL_NEG Register
R/W
10
FF
CCA antenna control
R/W
14
04
Preamble Length
R/W
18
80
Scramble_Tap (RX and TX)
R/W
1C
48
RX_SQ1_ ACQ (High) Threshold
R/W
20
01
RX-SQ1_ ACQ (Low) Threshold
R/W
24
88
RX_SQ2_ ACQ (High) Threshold
R/W
28
00
RX-SQ2_ ACQ (Low) Threshold
R/W
2C
98
SQ1 CCA Thresh (high)
R/W
30
01
SQ1 CCA Thresh (low)
R/W
34
98
ED or RSSI Thresh
R/W
38
20
SFD Timer
R/W
3C
90
Signal Field (BPSK - 11 Chip Barker sequence)
R/W
40
0A
Signal Field (QPSK - 11 Chip Barker sequence)
R/W
44
14
Signal Field (BPSK - Mod Walsh sequence)
R/W
48
37
Signal Field (QPSK - Mod Walsh sequence)
R/W
4C
6E
TX Signal Field
R/W
50
00/01/02/03
TX Service Field
R/W
54
00
TX Length Field (high)
R/W
58
FF
TX Length Field (low)
R/W
5C
FF
4-26