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DSK6455/EVM6455 FAQ

Topics

  • What is the difference between a DSK6455 and an EVM6455?
  • What is the difference between Rev. B and Rev. C boards?
  • R822 (gigabit ENET) issue on older Mezzanine cards
  • Ethernet and TCP/IP support

What is the difference between a DSK6455 and an EVM6455?
An EVM6455 a combination of a DSK6455 base card with a populated Mezzanine connector and a 6455 Mezzanine card plugged into it. This combination adds to the base functionality of the base DSK by adding a second DSP for multiprocessing through Serial Rapid I/O and Gigabit Ethernet capabilities. All documentation and target content examples will reside in the boards\dsk6455 subdirectory but the EVM6455 version will be more fully populated.

What is the difference between Rev. B and Rev. C boards?
Revision C boards incorporate a number of changes that had previously been incorporated as board level blue wire modifications on the Revision B boards. The only functional change is the DSP input clock frequency. Revision B boards used on on-board PLL to generate a 40MHz input clock (implying a 25MHz setting for the on-chip PLL for 1GHz operation). Revision C boards use a fixed 50MHz input clock, implying on on-chip PLL multiplier of 20. Consistent with this change, the configuraton DIP switches (SW3-6, SW3-7, SW3-8) that previously controlled the on-board PLL have no function on a Revision C board. Revision C is the official production version.

R822 (gigabit ENET) issue on older Mezzanine cards.
Early releases on the EVM6455 Mezzanine card have R822 (the GTXCLKDLY pull-up) populated. The correct configuration is to have R822 unpopulated. This pull-up determines part of the PHY power-up state. Depending on the code you are using, the PHY may or may not be reconfigured in software. If you are having problems with the gigabit network interface on the Mezzanine card, check R822 (see here for location).

Ethernet and TCP/IP support
Ethernet and TCP/IP support for this product is available through TI's Network Developers Kit (NDK). Please go to

http://www.ti.com/digitalmediasoftware

to request an evaluation copy.


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