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The preprogrammed demonstration design is an up counter and an output multiplexer to drive an LED array. The
demo shows a clock generator based on the ispMACH 4256ZE on-chip oscillator and timer (OSCTIMER) hardware
feature. The counter module is clocked at <5kHz to illustrate the ease at which very low speed timer functions can
be implemented with a CPLD. The 15-bit up counter advances each second. An output mux selects between hexa-
decimal patterns AAh or 55h depending on the count. The resulting light pattern will appear as an alternating pair
of lit LEDs per row.
Figure 2. Counter Demo Block Diagram
Run the Demonstration Design
WARNING: Do not connect the Breakout Board to your PC before you follow the driver installation procedure of
this section.
Communication with the Breakout Board with a PC via the USB connection cable will require the FTDI chip USB
hardware drivers contained in the
reliably recognize and program the Breakout Board. Drivers are distributed by Lattice as a stand-alone package or
with ispVM System version 17.9 or later. Use one of the two procedures below to install.
To load the FTDI chip USB hardware drivers via ispVM System:
1. Browse to
www.latticesemi.com/breakoutboards
2. Install ispVM System software.
3. Run ispVM System. Choose ispTools > Install/Uninstall LSC USB/Parallel Port Driver.
The LSC 32/64-Bit USB Drivers Install/Uninstall dialog appears.
4. Select FTDI USB 32-Bit Driver or FTDI USB 64-Bit Driver then click Install.
After a few moments, ispVM will indicate the installation is complete.
5. Click OK, then click Close from the LSC 32/64-Bit USB Drivers Install/Uninstall dialog.
6. Choose File > Exit to close ispVM System.
7. Connect the USB cable from a USB port on your PC to the board's USB mini-B socket (J2). After connection is
made, a green Power LED (D9) will light indicating the board is powered on.
8. Red LEDs will light and start to flash according to the preprogrammed demonstration design.
See the
Troubleshooting
ispMACH 4256ZE
AAh
55h
0: Count < 2
1: Count >= 2
15-bit
Up Counter
Clock
Generator
Software Requirements
section of this guide if the board does not function as expected.
ispMACH 4256ZE Breakout Board
0
2x4 LED
1
< 5kHz
section. Loading these drivers enables the computer to
and download ispVM System software.
4
Evaluation Kit User's Guide
Array
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