MachXO 2280 Breakout Board Evaluation Kit
Evaluation Board User Guide
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FPGA-EB-02038-1.2
7.3.
Board Modifications
This section describes modifications to the board to change or add functionality.
7.3.1.
Bypassing the USB Programming Interface
The USB programming interface circuit (
USB Programming and Debug Interface
section) may be optionally bypassed by
removing the 0 Ω resistors: R3, R4, R7, and R9 (See
Figure A.2. USB Interface to JTAG
).
Header landing J1 provides JTAG signal access for jumper wires or a 1 × 8 pin header.
7.3.2.
Applying External Power
The Breakout Board is powered by the circuit of
Figure A.2. USB Interface to JTAG
based on the 5V USB power source.
You may disconnect this power source by removing the 0 Ω resistors: R47 (VCCIO 3.3 V, Bank 0), R48 (VCCIO 3.3 V, Bank
1), R53 (VCCIO 3.3 V, Bank 4), R54 (VCCIO 3.3 V, Bank 5), R55 (VCCIO 3.3 V, Bank 2), R56 (VCCIO 3.3 V, Bank 3), R57
(VCCIO 3.3 V, Bank 6), R58 (VCCIO 3.3 V, Bank 7), R160 (VCC core) and R162 (VCCAUX). Power connections are
available from the expansion header landing, J9,
Figure A.3. Connectors and LEDs
7.3.3.
Measuring Bank and Core Voltages
Test points (TP1, through TP10) provide access to power supplies of the LCMXO2280C PLD. 0 Ω resistors: R47
(VCCIO 3.3 V, Bank 0), R48 (VCCIO 3.3 V, Bank 1), R53 (VCCIO 3.3 V, Bank 4), R54 (VCCIO 3.3 V, Bank 5), R55 (VCCIO 3.3
V, Bank 2), R56 (VCCIO 3.3 V, Bank 3), R57 (VCCIO 3.3 V, Bank 6), R58 (VCCIO 3.3 V, Bank 7), R160 (VCC core) and R162
(VCCAUX) can be removed to add a current meter inline or add a resistor shunt to measure voltage across.
7.4.
Mechanical Specifications
Dimensions: 3 in. [L] x 3 in. [W] x 1/2 in. [H]
7.5.
Environmental Requirements
The evaluation board must be stored between -40° C and 100° C. The recommended operating temperature is between
0° C and 90° C.
The board can be damaged without proper anti-static handling.
Summary of Contents for MachXO2280 Breakout Board
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