Analog Devices ICE-100B, User Manual

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Designing Custom Processor Boards
2-4 ICE-100B Emulator User Guide
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Designing Custom Processor Boards
When designing a custom processor board using Analog Devices
processors and DSPs, special care must be taken to ensure that the JTAG
interface is designed and laid out correctly. If the board is not designed
correctly, communication via the JTAG port may not work. Another side
effect may be that the interface works, but you are not able to run at the
highest possible JTAG clock frequency. The JTAG clock frequency is
dependant on the particular Analog Devices processor, as well as the delay
characteristics of the custom processor board.
To ensure that the custom board’s JTAG interface is designed and laid out
correctly, refer to Engineer-to-Engineer Note, Analog Devices JTAG Emu-
lation Technical Reference (EE-68), available from the Analog Devices Web
site. This document is a technical reference for implementing the JTAG
interface on your target.
Mechanical Specifications
The outer dimensions of the ICE-100B emulator are 2.99” x 0.785”. The
height of the JTAG connector (J1) is approximately 0.310”. The tallest
component on the top is 0.235”, and the tallest component on the bottom
is 0.045”. Refer to
Figure 2-3 .
Care must be taken when locating a custom target JTAG interface
connector, that no components are taller than about 0.15” if located
under the emulator.
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If there are any concerns that emulator components may short to
the target board, an insulator should be used to provide protection.