Board Modifications; Bypassing The Usb Programming Interface; Applying External Power; Measuring Bank And Core Power - Lattice Semiconductor MachXO2 Breakout Board User Manual

MachXO2 Breakout Board Evaluation Kit
Evaluation Board User Guide

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 by-passed
by removing the 0 ohm resistors: R5, R6, R7, R8 (See Appendix A. Schematic Diagram, Sheet 2 of 5). 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 Schematic Sheet 5 of 5 based on the 5 V USB power source. You may
disconnect this power source by removing the 0 Ω resistors: R42 (VCC_1.2 V) and R44 (VCC_3.3 V). Power connections
are available from the expansion header landings, J3 (+1.2 V, pins 1 and 3, schematic sheet 3 of 5) and J4 (+3.3 V, pins 1
and 3, schematic sheet 4 of 5).

7.3.3. Measuring Bank and Core Power

In addition to the expansion headers, test points (TP1, TP2) provide access to power supplies of the MachXO2 FPGA.
Inline 1 ohm resistors: R24 (VCCIO0, +3.3 V, Bank 0), R25 (VCCIO1, +3.3 V, Bank 1), R26 (VCCIO2, +3.3 V, Bank 2), R27
(VCCIO3, +3.3 V, Bank 3), R56 (VCC core, +1.2 V) can be used to measure current for the power supplies. VCCIO3 (Bank
3), VCCIO4 (Bank 4) and VCCIO5 (Bank 5) in the current version of the board with LCMXO2-7000HE-4TG144C device are
all connected to the same +3.3V supply.

7.4. Mechanical Specifications

Dimensions: 3 in. [L] × 3 in. [W] × 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.

7.6. Glossary

FPGA — Field Programmable Gate Array
DIP — Dual in-line package
LED — Light Emitting Diode.
LUT — Look Up Table
PCB — Printed Circuit Board
RoHS — Restriction of Hazardous Substances Directive
USB — Universal Serial Bus
WDT — Watchdog Timer
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All other brand or product names are trademarks or registered trademarks of their respective holders. The specifications and information herein are subject to change without notice.
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