Honeywell International Inc. RTA-50D Manuale Utente
MAINTENANCE MANUAL
965-1696
• Ethernet loopback
• RF control FPGA interface test
• Voltage monitor.
(g)
Operator-initiated functional self-test can be initiated by pressing the front panel switch,
grounding the functional test discrete or OMS command. The set of tests executed are
the same as in the power on self-test plus additional transmitter and receiver loop back
tests that check the functionality of the transmitter, antenna, interface, and receiver. This
mode is useful in diagnosing problems only seen after the RTA-50D VDR has been
running for some time.
grounding the functional test discrete or OMS command. The set of tests executed are
the same as in the power on self-test plus additional transmitter and receiver loop back
tests that check the functionality of the transmitter, antenna, interface, and receiver. This
mode is useful in diagnosing problems only seen after the RTA-50D VDR has been
running for some time.
(h)
Background self-tests are run continuously in the RTA-50D VDR as long as power is
applied. These tests only exercise circuitry in a way that is nonintrusive to system
operation. The background self-tests listed as follows are a subset of the functional
self-tests but, where possible, use the same test software routines:
applied. These tests only exercise circuitry in a way that is nonintrusive to system
operation. The background self-tests listed as follows are a subset of the functional
self-tests but, where possible, use the same test software routines:
• MPC8250 SDRAM
• MPC8250 FLASH
• MPC8250 EEPROM
• DSP HPI interface
• TMS6711 DSP SDRAM
• Ethernet loopback
• RF control FPGA interface test
• Voltage monitor.
(3)
Main DSP
(a)
The main DSP is a Texas Instruments TMS320C6711 DSP with 64 Mbit of external
SDRAM for program and data memory.
SDRAM for program and data memory.
(b)
The TMS6711 DSP interfaces to the RF control FPGA through a MCBSP serial bus
and to the TMS5410 DSP through a second MCBSP serial bus. The TMS6711 DSP
interfaces to the MPC8250 through shared memory accessed by its HPI interface. The
shared memory is configured as 64 message buffers of 4,096 bytes for each transfer
direction as well as a 592-byte control/status buffer. The TMS6711 DSP program is
loaded into its internal RAM and external SDRAM by the MPC8250 on power up.
and to the TMS5410 DSP through a second MCBSP serial bus. The TMS6711 DSP
interfaces to the MPC8250 through shared memory accessed by its HPI interface. The
shared memory is configured as 64 message buffers of 4,096 bytes for each transfer
direction as well as a 592-byte control/status buffer. The TMS6711 DSP program is
loaded into its internal RAM and external SDRAM by the MPC8250 on power up.
(c)
The TMS6711 DSP processes digital data provided by the RF control FPGA to generate
the receiver AGC loop control voltage in all voice and data receive modes of operation.
the receiver AGC loop control voltage in all voice and data receive modes of operation.
(d)
When operating in voice mode, the TMS6711 DSP monitors the PTT input to determine
when to switch between receive and transmit operation, and controls the switching of the
TMS5410 DSP between transmit and receive operation.
when to switch between receive and transmit operation, and controls the switching of the
TMS5410 DSP between transmit and receive operation.
(e)
When operating in voice transmit mode, the TMS6711 DSP performs the real-time
DSB-AM of digitized voice samples received from the TMS5410 DSP and delivers
252-kilo sample each second streams of I and Q digital modulation samples to the
RF CCA for RF carrier modulation and downlink transmission. Simultaneously while
transmitting the modulation samples, the TMS6711 DSP delivers the forward power
samples received from the RF CCA to the TMS5410 for side-tone output.
DSB-AM of digitized voice samples received from the TMS5410 DSP and delivers
252-kilo sample each second streams of I and Q digital modulation samples to the
RF CCA for RF carrier modulation and downlink transmission. Simultaneously while
transmitting the modulation samples, the TMS6711 DSP delivers the forward power
samples received from the RF CCA to the TMS5410 for side-tone output.
(f)
When operating in voice receive mode, the TMS6711 DSP performs envelope detection
of the 84-kilo sample each second I and Q digital data streams received from the RF CCA
and delivers the demodulated samples to the TMS5410 DSP.
of the 84-kilo sample each second I and Q digital data streams received from the RF CCA
and delivers the demodulated samples to the TMS5410 DSP.
EFFECTIVITY
ALL
23-20-59
Page 42
1 Mar 2011
© Honeywell International Inc. Do not copy without express permission of Honeywell.