User`s manual

9
SECTION 4 – BUILDING A QuickMAP
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Monitoring DSP Resource Meters
As described in the previous section, the ISP-100 utilizes three DSP chips to
generate the various processing device algorithms. In the QuickBUILD
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software, you will be shown a series of DSP resource meters for each of the
three chips. These meters provide a real-time estimate of DSP resource usage,
thus giving you a guideline on how many devices you can place in a given chip.
An accurate resource accounting may be requested from the “QMap
Information” report found in the “Edit” menu. Keep in mind that the DSP
resource meters are only estimates of DSP resource usage, and all designs
should be periodically monitored in the “QMap Information” report to know that
your design will “fit” within the DSP capabilities of the ISP-100. Here is what the
DSP resource meters look like:
Figure 3.
Figure 3’s meter settings represent your total resources available for all three
chips. (This is what your resource meters look like when you begin a new
QuickMAP.) X, Y, and P are DSP memory resources (measured in words), and C
represents DSP cycles. The “C” meter, or DSP cycles, will be your most
commonly watched resource. We will discuss X, Y, and P memory in more detail
in the Advanced Design section of this manual. A certain amount of resources
are necessary for the operating system to function, which accounts for the partial
usage of each meter. As a “rule of thumb”, we do not recommend that you
allow your DSP cycles to fall below 100.
When you select a device to be placed on the screen, you will be given a choice
as to which DSP chip it will reside in. As soon as the device is placed on the
screen, you will immediately see the DSP usage impact of that device. The
devices will be color-coded as to which DSP they reside in. Devices in DSP #1
will be Yellow. Devices in DSP #2 will be Green. And Devices in DSP #3 will
be Blue.