Problem with McBSP XWDLEN

   I'm developing on DSK with C6713. A want send data by EDMA at 100MHz 
to McBSP0. I configured EDMA and McBSP by DSP/BIOS Configurator.

   But, there is a problem. When I set Element length XWDLEN to 16-bits, 
everithing is OK, but, when I set Element length to 8-bits, output data 
are inconsistent.

   Example, when I sending 0xAA (10101010) at loop...

16-bits - OK - 101010101010101010101010101010101010101010101010101...
  8-bits - ?? - 10101010????????10101010????????10101010????????101...

??? - it's something as hi impedance.

Where is mistake? Is it possible sending 100MHz data with CPU at 200MHz?

Thank for reply.

-- MiLo

Miloslav H�la wrote:
>   I'm developing on DSK with C6713. A want send data by EDMA at 100MHz 
> to McBSP0. I configured EDMA and McBSP by DSP/BIOS Configurator.
> 
>   But, there is a problem. When I set Element length XWDLEN to 16-bits, 
> everithing is OK, but, when I set Element length to 8-bits, output data 
> are inconsistent.
> 
>   Example, when I sending 0xAA (10101010) at loop...
> 
> 16-bits - OK - 101010101010101010101010101010101010101010101010101...
>  8-bits - ?? - 10101010????????10101010????????10101010????????101...
> 
> ??? - it's something as hi impedance.
> 
> Where is mistake? Is it possible sending 100MHz data with CPU at 200MHz?
> 
> Thank for reply.
> 
> -- MiLo

Look at the data sheet.  It says the maximum speed is CPU/2 or 75 MHz, 
whichever is smaller.