GreenPAK Universal
Development Board
Silego Technology Inc.
www.silego.com
10/13/2014
Figure 3-9. Internal power source for GreenPAK3 chip and external board
3) The external power is used to run chip and external circuit (internal source output is in Hi-Z
state).
The configuration steps:
- open internal power switch;
- close external power switch;
- close all used expansion port switches in the software;
- hit Emulation/Test mode button (External power should be applied before this step);
Mention that GreenPAK3 chip is OTP part and "Emulation mode" allows to load the
project into GreenPAK3 chip many times, but after power loss all internal data will be lose.
Also when the GreenPAK chip is already programmed - user can use Emulation mode to
load some other project and test it on the emulation tool during the
Emulation mode, in that case emulation data will be cleared. The "Emulation" mode is not
necessary for checking programmed parts: in this case the "Test mode" is enough.
Expansion connector can be divided on 3 types of connections.
1. VDD;
2. GND;
3. Data connections.
VDD connection allows you to connect/disconnect external and internal power source. This
connection meets next requirements:
External power in range 1.8 - 5.5 volt.
High ohm voltage dividers are not recommended.
GND connection is connected directly to Development board, and cannot be controlled with
GreenPAK3 Designer.
Data connections are easiest way to connect external lines to GreenPAK3 chip. They are
software controlled switches. Every line is connected with 100Ohm resistor.
