AIS Baseband Processor
CMX910
SPC_ SPC_ SPC_
Special command code
Notes
In0
In1 Out0
Sets the gain factor to be applied to each
sample when calculating RSSI or CSTDMA
signal strength:
RSSI_gain = SPC_In0 ÷ 32768
CSTDMA_gain = SPC_In1 ÷ 32768
$14 (setup_gain)
•
•
Note: The value written into SPC_In0/1
must be between 0 and 32767 ($7FFF).
Used in AIS burst mode transmit only.
Waits until the message buffer is ready
then reports back (in SPC_Out0) the total
number of message bits created.
$17 (read_message_length)
$1F (eye_monitor)
•
Allows the Rx1 and Rx2 “eye diagrams” to
be monitored for diagnostic purposes.
When enabled, this function drives the
demodulated Rx1 and Rx2 channel signals
onto the Tx I and Q output pins
•
respectively.
SPC_In0 = $0000: Disable eye_monitor
SPC_In0 = $0001: Enable eye_monitor
© 2009 CML Microsystems Plc
51
D/910/6
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