Digital Signal Processing Reference
In-Depth Information
Figure 21.4. Example of decoded trace output.
over JTAG or USB, where they are reconstructed for the user. You
will need to parameterize this component to select the type of
connection to the host, the number of monitors, the buffer size, etc.
The SystemConsole host application decodes and displays
the received packets to show the data as it passes through the
system. Each video packet is displayed as one line in the display.
The sections below describe common video errors and how to
recognize them in the trace output.
Debug tools are also available which allow the debug host to
access memory mapped slaves within the target. The Altera JTAG
Avalon Master and USB Debug Master components are explicitly
designed to do this: if you do not have such a component avail-
able then most processor debuggers can be used in a similar way.
21.6 Converting from Clocked to Flow-
controlled Video Streams
In a functioning system the input to the flow-controlled
domain will send data as it becomes available. The system needs
to transfer, on average, one line's worth of pixels in each line scan
