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<tr><td width="100%" colspan="2" height="100" align="center" valign="top"><br><p align="center">[<a href="嵌入式系统.htm">回到开始</a>][<a href="375.htm">上一层</a>][<a href="380.htm">下一篇</a>]
<hr><p align="left"><small>发信人: doot (ltt), 信区: Embedded <br>
标 题: BDM手册(english)(1) <br>
发信站: BBS 水木清华站 (Thu Oct 26 16:16:13 2000) <br>
<br>
后面的网址可以买。目前所有的BDM都是 <br>
它们做的，只是它们不做软件，因此vision click <br>
,sds等都加上自己的软件大赚一笔。 <br>
The ZEN of BDM <br>
Craig A. Haller <br>
Macraigor Systems Inc. <br>
This document may be freely disseminated, electronical <br>
ly <br>
or in print, provided its total content is maintained, <br>
<br>
including the original copyright notice. <br>
Introduction <br>
You may wonder, why The ZEN of BDM ? <br>
Easy, BDM (Background Debug Mode) is different <br>
from other types of debugging in both implementation and in approach. Once y <br>
ou have a <br>
full understanding of how this type of debugging works, the spirit behind <br>
it if you will, you <br>
can make the most of it. <br>
Before we go any further, a note on terminology. “BDM” is Motorola’s term <br>
for a method of <br>
debugging. It also refers to a hardware port on their microcontroller chips, <br>
the “BDM <br>
port”. Other chips and other manufacturers use a JTAG port (IBM), a OnCE po <br>
rt (Motorola), <br>
an MPSD port (Texas Instruments), etc. (more on these later). The type of de <br>
bugging we <br>
will be discussing is sometimes known as “BDM debugging” even though it ma <br>
y use a <br>
JTAG port! For clarity, I will refer to it as “on- chip debugging” or OCD. <br>
This will include <br>
all the various methods of using resources on the chip that are put there to <br>
enable <br>
complete software debug and aid in hardware debug. This includes processors <br>
from IBM, <br>
TI, Analog Devices, Motorola, and others. <br>
This paper is an overview of OCD debugging, what it is, and how to use it mo <br>
st effectively. <br>
A certain familiarity with debugging is assumed, but novice <br>
through expert in <br>
microprocessor/ microcontroller design and debug will gain much from its rea <br>
ding. <br>
Throughout this paper I will try to be as specific as possible when it relat <br>
es to how <br>
different chips implement this type of debugging. The infomation comes from <br>
various <br>
sources. Motorola freely publishes all the information needed to use and imp <br>
lement their <br>
on- chip debugging features. Texas Instruments charges several thousand doll <br>
ars for the <br>
information and it is included in their emulator porting package. IBM releas <br>
es most of the <br>
information under Non- Disclosure Agreement. Analog Devices will not divulge <br>
the <br>
information with the belief that their debugger is all one needs (no comment <br>
from the <br>
author on this). <br>
This paper consists of two sections. <br>
SECTION I - The Past - a review for those new to microcontroller debugging <br>
“Debugging through history” is a quick review of the debugging methods <br>
that have <br>
been popular with embedded system designs. <br>
“Limitations, etc.” discusses the limitations of the aforementioned me <br>
thodologies. <br>
SECTION II - On- Chip Debugging <br>
“What is OCD - Hardware, Software?” describes various OCD implementati <br>
ons and <br>
exactly what OCD is. <br>
“Types of OCD” goes into specifics for various processors on the marke <br>
t. <br>
“Designing your Prototype” gives hints and advice on how to get the mo <br>
st out of OCD <br>
by properly designing your prototype system. <br>
“Designing your Product” gives hints and advice on how to use OCD in y <br>
our final <br>
product. <br>
“Choosing a Debugger” discusses the features to look for in a debugger <br>
to get the most <br>
out of the OCD features. <br>
About the author … <br>
The author is the president of Macraigor Systems, Inc., an OEM of embedded s <br>
ystems <br>
debug tools, and a firm believer that the silicon manufacturers are not mark <br>
eting the <br>
advantages of OCD nearly enough! This paper is intended to be purely infomat <br>
ional and <br>
not a marketing tool, although you should feel free to contact the author ab <br>
out OCD <br>
products. Contact information is at the end of the paper. <br>
Note: BDM, OnCE, and ColdFire are trademarks of Motorola Semiconductor. RISC <br>
Watch, <br>
RISCTrace, PowerPC, and IBM are trademarks of IBM Corporation. SHARC is prob <br>
ably a <br>
trademark of Analog Devices. Other terms which are trademarks are the proper <br>
ty of their <br>
respective owners. <br>
<br>
-- <br>
<br>
※ 来源:·BBS 水木清华站 smth.org·[FROM: 202.117.114.7] <br>
</small><hr>
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