Question about AM335x and XDS100v2-ARM

Hi g.f.,

g.f. said:

Should I layout the JTAG signal as TI 20-pin CTI and use adaptor to connect to the XDS10v2-ARM?

Yes, this is the JTAG layout used in all reference designs.

g.f. said:

If yes, which adaptor should I use?

See this page: http://www.blackhawk-dsp.com/products/PinConverters.aspx

Hi Biser,

Thank you for the reply.

So, I should use 20-pin cTI JTAG header on the target board, right?

XDS100v2-ARM has 20-pin ARM connector so that I need 20pinCTI - 20pinARM adaptor.

But from Blackhawk homepage, it seems that there are no adaptor for this.

Is this means that XDS100v2-ARM is not available for AM335x?

By the way, "ARM 20-pin Legacy" and "ARM 20-pin Cortex+ETM" signals are diffent.

Which is appropriate to XDS100v2-ARM?

best regards, g.f.

Which exactly part number did you order?

Hi Biser,

Thank you for the reply.

Actually, this question is from my customer.

They have order TMDSEMU100V2U-ARM .

best regards,

g.f.

For AM335X they should have ordered the TMDSEMU100V2U-20T. Tell them to change the order if it isn't too late.

Hi Biser,

Thank you for the reply.

It's too late to cancle/change the order.

I found the adaptor(TMDSADPEMU-20T) at following TI wiki: http://processors.wiki.ti.com/index.php/JTAG_Connectors#TMDSADPEMU-20T

Is it available to use this adaptor with TMDSEMU100V2U-ARM?

If yes, I will tell my customer to use cTI-20 pin header at target board side

and connect TMDSEMU100V2U-ARM via TMDSADPEMU-20T.

best regards,

g.f.

Yes, that is the correct adapter.

Hi Biser,

Suppose customer uses TMDSEMU100V2U-ARM without the adapter, the JTAG assignment on customer board should be ARM 20-pin Legacy in below table.

Correct ?

http://processors.wiki.ti.com/index.php/XDS_Target_Connection_Guide#Table_8._Emulation_Header_Pin_Definition

Thanks and regards,

Koichiro

Hi Koichiro,

What processor are you asking about? If it's the AM335X they would need to replicate the adapter on their PCB. I cannot say if this has ever been tried.

Hi Biser,

The device is AM3357. I am afraid I misunderstood something.

Here are my understanding based on the discussion.

Please correct me what is wrong.

1) Customer already has TMDSEMU100V2U-ARM.

The header pin assignment is ARM 20-pin Legacy (shown above)

2) According to your advice, JTAG connector on AM3357 must be cTI 20-pin.

And customer needs to buy TMDSADPEMU-20T adapter.

So connection should be like this:

TMDSEMU100V2U-ARM (ARM 20-pin) <=> TMDSADPEMU-20T (ARM 20-pin to cTI 20-pin) <=> cTI 20-pin connector on PCB <=> AM3357

3) Customer does not want to buy TMDSADPEMU-20T. It requires additional cost.

Instead, they want to put ARM 20-pin connector on their custom PCB (AM3357 on it).

They are asking how to connect ARM 20-pin connector and AM3357 JTAG signals.

I guess the adapter simply switches JTAG signals, so it is not difficult.

Using TMDSADPEMU-20T is mandatory, if customer uses TMDSEMU100V2U-ARM ?

(i.e. the adapter does something special which cannot be done on customer PCB ?)

Thanks and regards,

Koichiro

I don't have the schematics for connecting the AM335X JTAG signals directly to the ARM emulator, sorry.