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1. up to 2048 I/O Pins
2. I/O pin read and writes optimized for software bit-bang
   1. all memory accesses are on 32 bit boundaries
   2. output value can be bit 0, 7, 15 or 31 (assistance for software shift operations)
   3. output value can optionally be inverted
   4. tri-state control and output holding registers are treated the same
   5. tri-state control and output holding registers can be updated separately or with one write operation
   6. tri-state control and output holding registers can be read back
   7. I/O pin input "high" can be read as bit 0, 7, 15 or 31, or as 0xFFFFFFFF
   8. I/O pin input vale value can be optionally inverted
3. Virtual I/O Pins
   1. access similar to physical I/P Pins
   2. optional read only access to TMS, TCK, TDI pins
   3. optional access to DNA primitive pins
   4. access to LED's pins
4. optional LED'S output port (maximum 32 LED's)
   1. all LED's accessible with single 32 bit write
   2. accessible as single bit I/O as well
   3. output polarity is can be defined for each LED
   4. output value when RESET is asserted can be defined for each LED

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