22
MachXO2280 Breakout Board Evaluation Kit
USB Programming and Debug Interface
The USB mini-B socket of the Breakout Board serves as the programming and debug interface.
JTAG Programming: For JTAG programming, a preprogrammed USB PHY peripheral controller is provided on the
Breakout Board to serve as the programming interface to the MachXO2280 PLD.
Programming requires the ispVM System software.
Table 15. USB Interface Reference
Item
Description
Reference Designators
U2
Part Number
FT2232HL
Manufacturer
Future Technology Devices International (FTDI)
Web Site
www.ftdichip.com
Board Modifications
This section describes modifications to the board to change or add functionality.
Bypassing the USB Programming Interface
The USB programming interface circuit (
USB Programming and Debug Interface
section) may be optionally
bypassed by removing the 0 ohm resistors: R3, R4, R7, and R9 (See
Appendix A. Schematics
, Sheet 2 of 5).
Header landing J1 provides JTAG signal access for jumper wires or a 1x8 pin header.
Applying External Power
The Breakout Board is powered by the circuit of Schematic Sheet 2 of 4 based on the 5V USB power source. You
may disconnect this power source by removing the 0 ohm resistors: R47 (VCCIO 3.3V, Bank 0), R48 (VCCIO 3.3V,
Bank 1), R53 (VCCIO 3.3V, Bank 4), R54 (VCCIO 3.3V, Bank 5), R55 (VCCIO 3.3V, Bank 2), R56 (VCCIO 3.3V,
Bank 3), R57 (VCCIO 3.3V, Bank 6), R58 (VCCIO 3.3V, Bank 7), R160 (VCC core) and R162 (VCCAUX). Power
connections are available from the expansion header landing, J9, Schematic Sheet 3 of 5.
Measuring Bank and Core Voltages
Test points (TP1, through TP10) provide access to power supplies of the MachXO2280 PLD. 0 ohm resistors: R47
(VCCIO 3.3V, Bank 0), R48 (VCCIO 3.3V, Bank 1), R53 (VCCIO 3.3V, Bank 4), R54 (VCCIO 3.3V, Bank 5), R55
(VCCIO 3.3V, Bank 2), R56 (VCCIO 3.3V, Bank 3), R57 (VCCIO 3.3V, Bank 6), R58 (VCCIO 3.3V, 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.
Mechanical Specifications
Dimensions: 3 in. [L] x 3 in. [W] x 1/2 in. [H]
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.
