Jumper setting in MQX 4.1.1 USB CDC virtual_nic (Ethernet over USB) example...

[rickstuart]

Hi,

I'm having problems interpreting the Readme.txt file directions that are part of the USB CDC virtual_nic (Ethernet over USB) example. 

They state:

[From: Workbench->InformationCenterForARM_ExampleProjects->USB_DCD->ExampleDescription]

  TWR-K70F120M setup [Assumed to be the ARM Processor Board / NOT the TRW-SER (aka serial port) Board.]
   ----------------
   J1   VREGIN_VBUS
   1-2  ON

I think I found the J1 jumper. But no where does it say "VREGIN_VBUS". 

[From: Workbench->InformationCenterForARM_ExampleProjects->USB_DCD->ExampleDescription]

   50MHz clock input
   J19  1-2  ON
   J18  1-2  ON

I think I found the J18 and J19 jumpers.  But the labeling doesn't say 50MHz clock.  Rather J18 and J19 are labeled as "OFF-Y1 EN" and "Y1 PWR" respectively. 

Can anyone clear this up?

-thank you.

[RadekS · Accepted solution]

You are right, these names just shortly describes what these settings really cause.

If you place jumper at connector J1, it will cause connection between VREGIN and USB0_VBUS signals.

If you place jumper at connector J19 to position 1-2, it will cause powering of on-board 50 MHz clock source.

If you place jumper at connector J18 to position 1-2, it will cause enabling on-board 50 MHz clock and connecting to main EXTAL_MAIN signal (EXTAL pin).

For more details, please see TWR-K70F120M Quick Start Guide:

http://www.freescale.com/files/32bit/doc/quick_ref_guide/TWRK70F120MQSG.pdf

and TWR-K70F120M schematic:

http://www.freescale.com/files/32bit/hardware_tools/schematics/TWR-K70F120M-SCH_C.pdf

Have a great day,
RadekS

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