Waveform W6: Spi Bus Programming Adsic; Waveform W7: Receive Audio - Motorola ASTRO Digital Spectra Service Manual

6-4

Waveform W6: SPI Bus Programming ADSIC

Waveform W7: Receive Audio

July 1, 2002
18 Acquisitions
Tek stopped: Tek stopped:
T
T
1 1
2 1
T
T
3 1
Ch1 Ch2
Ch1 5.00V
5.00V
Ch3 5.00V
W6: SPI Bus Programming ADSIC.
Trace 1 - ADSIC_SEL*
Trace 2 - SPI_SCK
Trace 3 - MOSI
Note: These waveforms are typical to
any device on the SPI bus.
Tek stopped: 103 Acquisitions
T
T
1
2
T
3
4
T
5.00V Ch2 500mV
Ch1
Ch4
10.00V 10.00V
Ch3
W7: Receive audio: Receiving
1KHz tone @ 3KHz deviation, -60dBm. Volume set to rated audio.
Trace 1 - IRQB @ DSP (8KHz)
Trace 2 - SD0 @ C412 on Command Board
Trace 3 - SPKR_LOW Out of U450
Trace 4 - SPKR_HI Out of U450
Note 3: Actual level is dependent upon volume setting.
Troubleshooting Waveforms: ASTRO Spectra Waveforms
T
Ch1 Freq
= Hz
No period
found
T T
M 50ns Ch1 2.2 V
MAEPF-24381-O
M 200us Ch1 2.20 V
3
MAEPF-26077-O
Ch1 Freq
7.9118kHz
Low signal
amplitude
68P81076C25-C