Re: JTAG and ICE difference

From: Roman Mashak (mrv_at_tusur.ru)
Date: 06/02/04 

Date: Wed, 2 Jun 2004 14:26:33 +0900

Hello, Jack!
You wrote on Tue, 01 Jun 2004 22:21:21 -0500:

 JK> The traditional ICE (In Circuit Emulator) is a device that replaces
 JK> the processor or controller on the board. Inside it usually contains
 JK> a processor or controller of the same family. In some cases, this is
 JK> a special "bond out" on from the chip vendor, that brings out
 JK> extra hardware signals from inside the chip that are not connected to
 JK> pins in the regular version.
    So - mostly ICE is used when you don't have 'real' processor on your
development board, right ?
    But I don't quite understand JTAG function.... If I can debug and test
hardware/software using ICE, then why JTAG?
 JK> In addition to the processor it replaces, it generally contains other
 JK> circuitry such as RAM to emulate RAM and EPROM/ROM, and extra control
 JK> circuits to allow starting and stopping, single-stepping, and so on.
 JK> It might also have extra trace memory to capture bus cycles and so on.

    I was searching in Internet - and I found usually ICE consists of
seperate device, realizing all logic and functions, and pod installing on
socket in board. Then it's connected with cable....
    Did I understand correctly?

With best regards, Roman Mashak. E-mail: mrv@tusur.ru

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