PUMA T2
Technical Handbook
Technical description
Page 42 OTE Proprietary information
P/N: 779-0306/01
Revision 03
• Programming data sent on HDATASER (24 pulses to program synthesizer,
16+16+16 = 48 pulses to program the DACs), otherwise maintained at logic 0
state.
• Read of the calibration data registered on EEPROM at the edge of the radio
card by the microcontroller through SERDATAIN. Such a read is carried out
only when the equipment is turned on.
HENSYNT: CMOS digital signal for sending downloading pulse, active high, to the
synthesizer; it is generated by the Field Programmable Gate Array (FPGA) at the
end of a synthesizer programming sequence.
HENDAC: CMOS digital signal to enable the three 4 channel DACs. It is active low
and is generated by the Field Programmable Gate Array (FPGA) controlled by the
microprocessor.
HEN-EEPROM: TTL digital signal to enable the 32 kbit serial EEPROM on which
the main factory regulations of the radio card are written. Is active low, and is
generated by the µC.
SERDATAIN: serial data coming from the serial EEPROM. Since it is a 5 V TTL
type, it is shifted to 3.3 V TTL level to make it compatible to the microcontroller.
VBI: Voltage of interrupted battery (nominal: 7.2/7.4 V). It brings the battery voltage
after the switch in order to supply the Band Base card.
Fref: sinusoidal analogue signal; frequency reference of the synthesizer.
Electrical characteristics: 1 Vpp, 0 Vdc. It is generated by VCTXO on the radio card
and routed to the PLL on band base card by means of a suitable buffer which
provides to adjust the signal level.
The audio interface exchanges signals between the audio devices (microphone
and loudspeaker) and the DSP, both in uplink and downlink. This procedure is
monitored by the microcontroller.
The RT interface exchanges signals between the RT radio card and the DSP, both
in uplink and downlink.
The keyboard has 18 led backlit keys located on a 3x6 matrix and is monitored by
the microprocessor
The display (96x64 pixel) is led backlit and is monitored by the microprocessor.
The microcontroller manages:
• TETRA protocol from Upper MAC sublevel to the superior levels of the
Mobility Management and the Call Control;
• MMI (user commands, keyboards, display);
• DTE;
• interface towards the firmware of the lower MAC located on the DSP;
• terminal identification;
• DSP operative programs download;
• external accessories.
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