SOFA/DOC/source/dc_ac_character.rst

DC and AC Characteristics
-------------------------

FROG contains 196 I/O pins, whose details are summarized in the following tables.

I/O usage and port information
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

.. table:: I/O usage and sizes

  +-----------+------------------------------------------------------------------------+-------------+
  | I/O Type  | Description                                                            | No. of Pins |
  +===========+========================================================================+=============+
  | Data I/O  | Datapath I/Os of FPGA fabric                                           | 80          |
  +-----------+------------------------------------------------------------------------+-------------+
  | VDD_core  | VDD supply for FPGA core                                               | 28          |
  +-----------+------------------------------------------------------------------------+-------------+
  | VSS_core  | VSS supply for FPGA core                                               | 28          |
  +-----------+------------------------------------------------------------------------+-------------+
  | VDD_io    | VDD supply for FPGA I/Os                                               | 16          |
  +-----------+------------------------------------------------------------------------+-------------+
  | VSS_io    | VSS supply for FPGA I/Os                                               | 16          |
  +-----------+------------------------------------------------------------------------+-------------+
  | Clk       | Operating clock of FPGA core                                           | 1           |
  +-----------+------------------------------------------------------------------------+-------------+
  | Reset     | Reset flip-flop contents to logic '0'                                  | 1           |
  +-----------+------------------------------------------------------------------------+-------------+
  | ProgClk   | Clock used by configuration protocol to program FPGA fabric            | 1           |
  +-----------+------------------------------------------------------------------------+-------------+
  | ProgReset | Reset configurable memories to logic '0'                               | 1           |
  +-----------+------------------------------------------------------------------------+-------------+
  | CCin      | Input of configuation protocol to load bitstream                       | 1           |
  +-----------+------------------------------------------------------------------------+-------------+
  | CCout     | Output of configuration protocol to read back bitstream                | 1           |
  +-----------+------------------------------------------------------------------------+-------------+
  | TestEn    | Activate the test mode of FPGA fabric                                  | 1           |
  +-----------+------------------------------------------------------------------------+-------------+
  | SCin      | Input of built-in scan-chain to load data to flip-flops of FPGA fabric | 1           |
  +-----------+------------------------------------------------------------------------+-------------+
  | SCout     | Output of built-in scan-chain to read back flip-flops from FPGA fabric | 1           |
  +-----------+------------------------------------------------------------------------+-------------+
  | Spypad    | Spypads for debugging. See details in spypad section                   | 14          |
  +-----------+------------------------------------------------------------------------+-------------+
  | Total     |                                                                        | 191         |
  +-----------+------------------------------------------------------------------------+-------------+

Recommended Operating Conditions
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

.. table:: Recommended Operating Conditions

  +----------+------------------------------+------+------+-------+
  | Symbol   | Description                  | Min  | Max  | Units |
  +==========+==============================+======+======+=======+
  | VDD_io   | Supply voltage for I/Os      | 1.26 | 2.34 | V     |
  +----------+------------------------------+------+------+-------+
  | VDD_core | Supply voltage for FPGA core | 0.56 | 1.04 | V     |
  +----------+------------------------------+------+------+-------+
  | V_in     | Input voltage for other I/Os | 0.56 | 1.04 | V     |
  +----------+------------------------------+------+------+-------+
  | I_in     | Maximum current through pins | N/A  | 4    | mA    |
  +----------+------------------------------+------+------+-------+
  | f_max    | Maximum frequency of I/Os    | N/A  | 70   | MHz   |
  +----------+------------------------------+------+------+-------+
  
Typical AC Characteristics
^^^^^^^^^^^^^^^^^^^^^^^^^^

.. table:: Typical AC characteristics for FPGA I/Os

  +-----------------+-------------------------------------------+------+------+-------+
  | Symbol          | Description                               | Min  | Max  | Units |
  +=================+===========================================+======+======+=======+
  | V_in Overshoot  | Maximum allowed overshoot voltage for Vin | 2.34 | 2.34 | V     |
  +-----------------+-------------------------------------------+------+------+-------+
  | V_in Undershoot | Minimum allowed overshoot voltage for Vin | 1.26 | 1.26 | V     |
  +-----------------+-------------------------------------------+------+------+-------+
  | I_VDD_core      | Quiescent VDD_core supply current         | 5000 | 5000 | mA    |
  +-----------------+-------------------------------------------+------+------+-------+
  | I_VDD_io        | Quiescent VDD_io supply current           | TBD  | TBD  | mA    |
  +-----------------+-------------------------------------------+------+------+-------+