ADSP-214xx SHARC Processor Hardware Reference 23-39
System Design
EZ-KIT Lite Schematics
The EZ-KIT Lite® evaluation system schematics are a good starting refer-
ence. Because the EZ-KIT Lite board is for evaluation and development,
extra circuitry is provided in some cases. Read the EZ-KIT Lite board
schematic carefully, because sometimes a component is not populated and
sometimes it has been added to make it easier to access. The design data-
base for the SHARC processor EZ-KIT Lite boards is available online and
contains all of the electronic information required for design, layout, fab-
rication, and assembly:
ftp://ftp.analog.com/pub/tools/Hardware/Reference_Designs
Oscilloscope Probes
When making high speed measurements, be sure to use a “bayonet” type
or similarly short (< 0.5 inch) ground clip, attached to the tip of the oscil-
loscope probe. The probe should be a low capacitance active probe
with 1 pF or less of loading. The use of a standard ground clip with four
inches of ground lead causes ringing to be seen on the displayed trace and
makes the signal appear to have excessive overshoot and undershoot.
A 1 GHz or better sampling oscilloscope is needed to see the signals
accurately.
Recommended Reading
The text High-Speed Digital Design: A Handbook of Black Magic is recom-
mended for further reading. This book is a technical reference that covers
the problems encountered in state-of-the-art, high frequency digital cir-
cuit design. It is also an excellent source of information and practical
ideas. Topics covered in the book include:
• High-Speed Properties of Logic Gates
• Measurement Techniques
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