XDS510 USB Hardware Problem

I am developing a DM642-based target board using a XDS510 USB JTAG
emulator. Yesterday I found that the emulator can't connect my target
board.  The error log of the SDConfig is listed below:

** Checking emulator/eZdsp scan connection
** Emulator Test **
 $$ EmuProductName=XDS510USB
 $$ EmuPortAddr=0x510
 $$ EmuPortMode=USB
 $$ ProductIdQ0
 $$ ProductVersion
 ** Emulator Scan Test
   -- Found JTAG IR length of 8
   -- Found 1 JTAG device(s) in the scan chain

Where the IR length should be 38. I inserted a probe to check all JTAG signals
between my target board and the emulator and found that the EMU0/1 are at
intermediate voltage  level which were approximately 1 V.  Then I changed the
pull-up resistors of these two signals from 1k-Ohm to 82-Ohm only to find no
improvement.

Is there any possibility that my target DM642 was damaged? Or do I have to
change another new emulator?
	

Pan??

Check EMU0 & 1 connections/routing.  They should read
high with no external pullups.  If the 1K [that is
probably too low for normal useage] did not 'get the
job done', then you have a problem.  82 ohms is isWAY
too low.  There is probably a "crossed signal" or the
EMU pins on the connector are incorrecly routed.

The output that you provided indicates that the DSP is
"seeing" EMU0 & 1 as low [this selects the 8 bit
boundary scan TAP instead of the 38 bit 'emulation
TAP].

,mikedunn

--- pan.teng@pan.... wrote:

> I am developing a DM642-based target board using a
> XDS510 USB JTAG emulator. Yesterday I found that the
> emulator can't connect my target board.  The error
> log of the SDConfig is listed below:
> 
> ** Checking emulator/eZdsp scan connection
> ** Emulator Test **
>  $$ EmuProductName=XDS510USB
>  $$ EmuPortAddr=0x510
>  $$ EmuPortMode=USB
>  $$ ProductIdQ0
>  $$ ProductVersion
>  ** Emulator Scan Test
>    -- Found JTAG IR length of 8
>    -- Found 1 JTAG device(s) in the scan chain
> 
> Where the IR length should be 38. I inserted a probe
> to check all JTAG signals between my target board
> and the emulator and found that the EMU0/1 are at
> intermediate voltage  level which were approximately
> 1 V.  Then I changed the pull-up resistors of these
> two signals from 1k-Ohm to 82-Ohm only to find no
> improvement.
> 
> Is there any possibility that my target DM642 was
> damaged? Or do I have to change another new
> emulator?
> 
> 
> 
> 
> 
> 
> 
>     c6x-unsubscribe@c6x-...
> 
>  
> 
> 
> 
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