Altera DSP Development Kit, Cyclone II Edition Getting St Manuale Utente Scaricare il pdf (Pagina 30)

2–20 Getting Started User Guide Altera Corporation

DSP Development Kit, Cyclone II Edition August 2006

Testing the Board Using the Factory Design

Collecting Data Using the SignalTap II Logic Analyzer

To collect data from the design for analysis, follow these steps.

1. In the Instance Manager section of the SignalTap II window, click

Run Analysis and observe the following:

a. Observe the D/A converter input on comb[13..0]. It shows a

combination of two sine waves.

b. Observe the A/D converter output on a2db[11..0]. It shows

an attenuated combination of two sine waves.

1 The A/D converter output is attenuated because the bit

resolution is reduced from 14 bits to 12 bits. Analog

circuitry on the Cyclone II DSP development board also

causes some additional attenuation.

2. Choose Create SignalTap II List File from Create / Update (File

Menu). The Quartus II software generates the file

sines_auto_signaltap_0.txt in the project directory.

Analyzing the Data in the MATLAB Software

To analyze the a2db data from sines_auto_signaltap_0.txt in MATLAB,

follow these steps:

1. Start the MATLAB software.

2. At the MATLAB Command Window, type the following command:

nstp_plot('sines_auto_signaltap_0.txt') r

The MATLAB software displays a normalized plot of the DAC

CHANNEL A input similar to Figure 2–11.

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Altera DSP Development Kit, Cyclone II Edition Getting St Manuale Utente Pagina 30