BenQ
Rev 1.0
3.2.3 Automatic Power Control (APC)
Purpose of the Automatic Power Control (APC) is to generate an
envelope signal to control the power ramping up, ramping down and
power level of the radio burst.
The APC structure is intended to support single slot and multi-slots
transmission with smooth power transition when consecutive bursts are
transmitted at different power level. It includes a DAC and a RAM in
which the shape of the edges (ramp-up and ramp-down) of the
envelope signals are stored digitally. This envelope signal is converted
to analog by a 10 bits digital to analog converter. Timing of the APC is
generated internally and depends of the real time signals coming from
the TSP and the content of two registers which control the relative
position of the envelope signal versus the modulated I & Q.
3.2.4 Time serial port (TSP)
Purpose of the time serial port is to control in real time the radio
activation windows of NAUSICA which are BUL power-on, BUL
calibration, BUL transmit, BDL power-on, BDL calibration and BDL
receive and the ADC conversion start.
These real time control signals are processed by the TPU of Ulysse
and transmitted serially to NAUSICA via the TSP, which consists in a
very simple two pins serial port. One pin is an enable (TEN) the other
one the data receive (TDR). The master clock CK13M divided by 2
(6.5MHz) is used as clock for this serial port.
3.2.5 Voice band Codec (VBC)
The VBC processes analog audio components in the uplink path and
transmits this signal to DSP speech coder through the voice serial port
(VSP). In the downlink path the VBC converts the digital samples of
speech data received from the DSP via the voice serial port into analog
audio signal. Additional functions such as programmable gain, volume
control and side-tone are performed into the voice band codec.
3.2.6 Micro-controller serial port (USP)
18
The micro-controller serial port is a standard synchronous serial port.
It consists in three terminals, data transmit (UDX), data receive (UDR)
and port enable (UEN). The clock signal is 13MHz clock. The USP
receives and sends data in serial mode from and to the external
micro-controller and in parallel mode from and to the internal GSM
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