ARM Technical Support Knowledge Articles

MEMORY ADDRESS MISMATCH AT ADDRESS 0X20

Applies to: MCB2100 Evaluation Board

Answer


Information in this article applies to:


QUESTION

I'm using the Keil MCB2100 Board together with ULINK. Whenever I start the debugger, I get a message box with the following:

Error
Memory Mismatch!
Address: 0x00000020
Value = 0xB0
Expected = 0x58

What can be wrong?

ANSWER

It appears that the device is in Serial Flash Download Mode and the Interrupt vector gets redirected.

Check to see if the jumper settings match the default setting. The MCB2100 Board is shipped with the following configuration:

Jumper       State    Description
--------------------------------------------------------------
J1 - ISP      ON      Enable In-System Programming via COM0.
J2 - AV       ON      Connect POT1 potentiometer to AIN0.
J3 - 3.3V     ON      Connect 3.3V to CPU.
J4 - 1.8V     ON      Connect 1.8V to CPU.
J5 - V3A      ON      Connect analog reference voltage to CPU.
J6 - LED      ON      Enable Port1.16 - Port1.23 LED's.
J7 - INT1     ON      Enable INT1 Push Button.
J8 - ETM      OFF     Disable Embedded Trace.
J9 - JTAG     ON      Enable JTAG interface.
J10 - RST     ON      Enable Reset via COM0.
J11 - CAN     ON      Enable CAN driver.
J12 - RD1     ON      Connect RD1 CAN receiver input.
J13 - RD2     ON      Connect RD2 CAN receiver input.
--------------------------------------------------------------

If J1 and J7 are OFF, the LPC21xx device may go into Flash Download Mode on Reset.

A similar problem may occur if you have connected the MCB2100 COM0 port to a PC. In this case disconnect J1 and J10.

MORE INFORMATION

SEE ALSO

Article last edited on: 2006-09-11 15:16:49

Rate this article

[Bad]
|
|
[Good]
Disagree? Move your mouse over the bar and click

Did you find this article helpful? Yes No

How can we improve this article?

Link to this article
Copyright © 2011 ARM Limited. All rights reserved. External (Open), Non-Confidential