Dallas Chip Question...

[Promocom]

I can save my company $$$ if I can repair a custom made multiplexer unit we had made in the 1990's. The designer has long gone out of business and most parts are unobtainable.
The present problem is a couple of the Dallas DS2550T controller modules have gone bad. I was able to find a couple blanks from overseas but I need to copy one of the good modules to the blanks. Can this be done and is there some company that could do it?

**broken link removed**

Thanks

 

[dknguyen]

You need to be more specific. "Copy?" "Blank?" WHat exactly do you mean by these terms?

If any of this involves reverse engineering an obsolete IC, you are flat out of luck. Far cheaper to just design a brand new module from scratch.

 

[Pommie]

Do you have a link to a data sheet?

Mike.

 

[arhi]

DS2250 is a 8051 board with battery and some ram.... lemme check ..

google rules: Dallas Semiconductor DS2250T

The Dallas Semiconductor DS2250T is an 8051 Soft Microcontroller Module, 32 I/O lines, 2 Timers/Counters, 5 Interrupts/2 priority levels, ROM-less, 128 Bytes On-chip RAM, Real-time Clock, 128k Byte XRAM with Battery Backup, Bootstrap Loader.

now, you need someone to fetch the software from that module and burn on another one ...

so ... DS5000FP on board (8051 compatible) ... I did not go trough the user guide and data sheet but it should be possible to read the code from the module if it is not "protected", if it is contact **broken link removed**, they migt be able to help

 

[kchriste]

Looks like you are really screwed:

SOFTWARE SECURITY
One of the most important features of the Secure Microcontroller
family is firmware/memory security. The devices
were specifically designed to offer an unprecedented
level of protection to the user application
software, preventing unauthorized copying of firmware
and denying access to critical data values. The use of
RAM rather than the traditional ROM or EPROM for program
storage increases the security, since tampering
with the system will result in the loss of the RAM contents.
Additional features such as real–time high–speed
memory encryption, generation of dummy addresses
on the bus, and internal storage of vector RAM increases
the security of a Secure Microcontroller/Microprocessor–
based system.
The DS5002FP Secure Microprocessor Chip and
DS2252T Secure Microcontroller Module offer the highest
level of security, with permanently enabled memory
encryption, a 64–bit random encryption key, and a self–
destruct input for tamper protection. The DS5000FP
Soft Microprocessor Chip and DS5000(T) and
DS2250(T) Soft Microcontroller Modules offer lesser,
but still substantial, protection with optional data encryption
and a 48–bit encryption key.

 

[Promocom]

I was afraid of that. Thanks anyway.