View source for XDEV command

{{NextRegister
|Number=$F0
|Readable=Yes
|Writable=Yes
|ShortDesc=Issue 4 only
}}
  * Select Mode
     (R)
       bit 7 = 1 if in select mode
       bits 1:0 indicate currently selected device
         00 = none
         01 = Xilinx DNA
         10 = Xilinx XADC
     (W)
       bit 7 = 1 to enter select mode, 0 to enter selected device mode (no other bits have effect)
       bit 6 = 1 to change selected device
       bits 1:0 selected device
         00 = none
         01 = Xilinx DNA
         10 = Xilinx XADC
   * Xilinx DNA Mode
     (R)
       bit 0 = dna bit (serial stream shifts left)
       the first eight bits read will indicate the length of the following dna bits
     (W)
       bit 7 = 1 to enter select mode (write has no other effect)
       otherwise causes dna string to reload, ready for fresh read
   * Xilinx XADC Mode (Documented in Xilinx Series 7 UG480)
     (R)
       bit 6 = 1 if XADC is busy with conversion (BUSY)
       bit 1 = 1 if XADC conversion completed since last read (EOC, read clears)
       bit 0 = 1 if XADC conversion sequence completed since last read (EOS, read clears)
     (W)
       bit 7 = 1 to enter select mode (write has no other effect)
       bit 6 = 1 to reset XADC (RESET)
       bit 0 = 1 to start conversion (CONVST)
* Re-enter select mode at any time by writing to the register with bit 7 set
* Select a device to communicate with by writing to the register with bits 6 & 7 set
* Exit select mode by writing zero to bit 7; thereafter the particular device is attached to the nextreg