Recommended Reading - Analog Devices ADSP-21261 SHARC Hardware Reference Manual

Designing for High Frequency Operation
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.
CASE 1:
BYPASS CAPACITORS ON NON-COMPONENT
(BOTTOM) SIDE OF BOARD, BENEATH DSP PACKAGE
Figure 15-6. Bypass Capacitor Placement

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
15-18
a
ADSP-21262
S
CASE 2:
BYPASS CAPACITORS ON COMPONENT (TOP)
SIDE OF BOARD, AROUND DSP PACKAGE
ADSP-2126x SHARC Processor Hardware Reference