Eric wrote:
> Piotr wrote:
>
> > Where can I find a schematic of JTAG interface for MAC7100 (ARM7DMI)?
>
> Are you sure you want to use these? It's my understanding these are
> marketted only to automotive related companies. And if you worked for
> one of them, you'd probably have the budget to buy commercial tools.
>
> I advise the Atmel or Luminary Arm devices for hobbiest and people who
> work for small companies. The NXP/Philips parts are also worth
> considering but I'm not real happy with their support.
>
> If if you're a diehard Freescale user, try their new Coldfire devices.

Probably the same problem.  With 1.5V core, 2.5V DDR and 3.3V I/O, the
jtag lines should be between 1.5V and 3.3V.  I have seen similar
requirements with jtag at 2.5V.   In any case, don't hock it up with
cheap jtag programmer.  I have learned my lesson, have you?

> 
> Eric

Piotr wrote:

> Where can I find a schematic of JTAG interface for MAC7100 (ARM7DMI)?

Are you sure you want to use these? It's my understanding these are
marketted only to automotive related companies. And if you worked for
one of them, you'd probably have the budget to buy commercial tools.

I advise the Atmel or Luminary Arm devices for hobbiest and people who
work for small companies. The NXP/Philips parts are also worth
considering but I'm not real happy with their support.

If if you're a diehard Freescale user, try their new Coldfire devices.

Eric

Amontec, Larry wrote:
> Piotr wrote:
>
> > linnix wrote:
> >  > Here are two options (other people can give you more):
> >  >
> >  > 1. Use a CPLD (e.g. Xilinx cool runner) between the parallel port and
> >  > Mac7100.
> >  >
> >  > 2. Use a micro (e.g. Atmel AVR) and rs232 (Max232) between the serial
> >  > port and Mac7100.
> >  >
> >  > Which one are you interested in?
> >
> > Hi, Thanks for your replay.
> >
> > I would like use the second solutions, but I don't know that you mean.
> > What I should do with uC Atmel AVR?
> >

Use the micro to buffer data and translate voltage levels.   Start out
with the micro at 5V, while talking to the rs232 driver.  Download a
page of data into the micro.  Switch to the target power (2.5V) and
switch on the Jtag lines.  The rest is standard jtag commands.  Don't
forget to tri-state and pull the lines to 2.5V while talking to the PC.

>
> But what do you want to do ?
>   - doing a new JTAG emulator
>   - accessing your ARM7TDMI via JTAG (as using the Amontec JTAGkey-Tiny)

Great for buring the 2.5V jtag lines.  The Amontec JTAGkey-Tiny is 2.8V
to 5V.

> 
> Regards,
> Laurent

Amontec, Larry wrote
 > But what do you want to do ?

I want to programming my MAC7121, so I search for schematic of JTAG or 
something else. I don't want to buy this, but I would like to build it.

-- 
Piotr Piwko

Piotr wrote:

> linnix wrote:
>  > Here are two options (other people can give you more):
>  >
>  > 1. Use a CPLD (e.g. Xilinx cool runner) between the parallel port and
>  > Mac7100.
>  >
>  > 2. Use a micro (e.g. Atmel AVR) and rs232 (Max232) between the serial
>  > port and Mac7100.
>  >
>  > Which one are you interested in?
> 
> Hi, Thanks for your replay.
> 
> I would like use the second solutions, but I don't know that you mean. 
> What I should do with uC Atmel AVR?
> 

But what do you want to do ?
  - doing a new JTAG emulator
  - accessing your ARM7TDMI via JTAG (as using the Amontec JTAGkey-Tiny)

Regards,
Laurent

linnix wrote:
 > Here are two options (other people can give you more):
 >
 > 1. Use a CPLD (e.g. Xilinx cool runner) between the parallel port and
 > Mac7100.
 >
 > 2. Use a micro (e.g. Atmel AVR) and rs232 (Max232) between the serial
 > port and Mac7100.
 >
 > Which one are you interested in?

Hi, Thanks for your replay.

I would like use the second solutions, but I don't know that you mean. 
What I should do with uC Atmel AVR?

-- 
Piotr Piwko

linnix wrote:
> Piotr wrote:
> 
>>Hi,
>>
>>Where can I find a schematic of JTAG interface for MAC7100 (ARM7DMI)? I
>>would like to programming this uC, but I can't find free programming tools.
>>
> 
> 
> Here are two options (other people can give you more):
> 
> 1. Use a CPLD (e.g. Xilinx cool runner) between the parallel port and
> Mac7100.
> 
> 2. Use a micro (e.g. Atmel AVR) and rs232 (Max232) between the serial
> port and Mac7100.
> 
> Which one are you interested in?
> 
> PS:  Google error, second posting
> 

Hi Piotr,

Use the sdkarm + Amontec JTAGkey - Tiny, only &#4294967295;29.-
sdk4arm (software dev. kit for ARM) includes the OpenOCD JTAG server 
compatible with the JTAGkey-Tiny, includes GCC GDB + ECLIPSE ...

This low cost bundle will allow you to have a very fast access to your 
ARM7TDMI via JTAG. HALT RESET RAM ACCESS STEP-BY-STEP ...

The JTAG interface of the ARM7TDMI are all the same.

This sdkarm + Amontec JTAGkey was used for uploading the  Philips 
LPC21xx and Atmel SAM7 internal Flash, but the OpenOCD must be modified 
for all specific devices! You can take the source code of OpenOCD (yes 
it 'is free) and modify it for your MAC7100.

If you are in production and need a very robust JTAG interface, please 
use the JTAGkey instead the JTAGkey-Tiny.

goto http://www.amontec.com to download the sdk4arm.

Best regards,
Laurent

Piotr wrote:
> Hi,
>
> Where can I find a schematic of JTAG interface for MAC7100 (ARM7DMI)? I
> would like to programming this uC, but I can't find free programming tools.
>

Here are two options (other people can give you more):

1. Use a CPLD (e.g. Xilinx cool runner) between the parallel port and
Mac7100.

2. Use a micro (e.g. Atmel AVR) and rs232 (Max232) between the serial
port and Mac7100.

Which one are you interested in?

PS:  Google error, second posting