XR18W753 Datasheet, PDF (15/27 Pages) Exar Corporation – SINGLE CHIP 868MHZ TO 956MHZ RF TRANSCEIVER

REV. 1.0.0
3.2 DETAILED REGISTERS DESCRIPTIONS
XR18W753
SINGLE CHIP 868MHZ TO 956MHZ RF TRANSCEIVER
ADDRESS
REGISTER NAME
DESCRIPTION
TYPE
0x13
ED_AV_TIME
Measurement time for ED Measurement
R/W
b[3:0] = 0000 --> 8 symbols
b[3:0] = 0001 --> 5.0 mSec
b[3:0] = 0010 --> 5.5 mSec
b[3:0] = 0011 --> 6.0 mSec
b[3:0] = 0100 --> 6.5 mSec
b[3:0] = 0101 --> 7.0 mSec
b[3:0] = 0110 --> 7.5 mSec
b[3:0] = 0111 --> 8.0 mSec
b[3:0] = 1000 --> 8.5 mSec
b[3:0] = 1001 --> 9.0 mSec
b[3:0] = 1010 --> 9.5 mSec
b[3:0] = 1011 --> 10.0 mSec
b[3:0] = 11xx --> 10.0 mSec
b[7:4] not used
0x14
MODEM_ED
Via this register, the ED measurement time can be defined. In case
value 0 is chosen, the measurement time is compliant to the defini-
tion of the IEEE802.15.4b standard. In the 902-928 MHz band, the
measurement time equals 128us. For the 868 MHz band, this sym-
bol time equals 320us.
LQI Value, updated as a result of successful ED measurement.
R
0x15
MODEM_LQI
The result of the ED measurement is available in this register.
The value is normalized and on average will be independent from
the ED measurement time (ED_AV_TIME). Note that the value of
MODEM_ED also depends on the content of ED_THRESH (0x2E).
LQI Value, updated after complete frame reception.
R
During reception of a data packet, the correlation values of the
symbol mapping is accumulated and divided by the number of sym-
bols in the packets. The number is a normalized Link Quality Indi-
cation.
0x16-0x1F Reserved
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