Troubleshooting - Lattice Semiconductor MachXO2-1200ZE User Manual

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MachXO2-1200ZE Breakout Board

Lattice Semiconductor

Evaluation Kit User's Guide

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: R5, R6, R7, R8 (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 5 of 5 based on the 5V USB power source. You

may disconnect this power source by removing the 0 ohm resistors: R42 (VCC_1.2V) and R44 (VCC_3.3V). Power

connections are available from the expansion header landings, J3 (+1.2V, pins 1 and 3, schematic sheet 3 of 5) and

J4 (+3.3V, pins 1 and 3, schematic sheet 4 of 5).

Measuring Bank and Core Power

In addition to the expansion headers, test points (TP1, TP2) provide access to power supplies of the MachXO2-

1200ZE PLD. Inline 1 ohm resistors: R24 (VCCIO0, +3.3V, Bank 0), R25 (VCCIO1, +3.3V, Bank 1), R26 (VCCIO2,

+3.3V, Bank 2), R27 (VCCIO3, +3.3V, Bank 3), R56 (VCC core, +1.2V) can be used to measure current for the

power supplies.

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.

Glossary

PLD: Programmable Logic Device

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