Help: ICE_KEYS_TPD

Test port data

A runtime method for reading the current contents of the test port.
The default TPOE=1 test port selects the auxiliary module.  
The current contents of this test vector are 

  bit=0  MGO	- master enable of a port, used to trigger another port or card
     =1  XSYNCI - the input of the eXternal sync port (needs DC coupled input jumpers 1&3)
     =2  TSYNCI - the input trigger bit, usually bit0 of IOModule 1
     =3  OPPMS  - a one pulse per millisecond timer
     =4  PWR5V  - enable for the IO Module's 5V power brick
     =5  TBD
     =6  TBD
     =7  PCREF  - 10MHz reference for the programmable clock