Silego Technology Inc.
Page 9 of 41
08/15/17
GreenPAK Advanced
Development Platform
The GreenPAK Advanced Development Platform provides three possible ways of using expansion connector:
1) Internal power is used to run the chip, no external power output is needed, external signal sources and loads can be connected
between pins and GND.
The configuration steps:
• close internal and open external power switch
• close all used expansion port switches in the software
• hit Emulation/Test mode button
This is the common way of using an Expansion connector.
2) Internal power is used to run the chip and external circuit (internal power source/sink current is limited to 50 mA).
The configuration steps:
• close internal power switch
• close external power switch
• close all used expansion port switches in the software
• hit Emulation/Test mode button
3) External power is used to run the 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)
Note that the GreenPAK chip has internal OTP memory which is normally loaded into RAM registers at initialization time.“Emu-
lation mode” will bypass this load, and write the updated version of the project directly into the RAM register inside the GreenPAK
chip many times, but after power loss all internal data will be lost. When the GreenPAK chip is already programmed the user can
use Emulation mode to load another project and test it on the emulation tool in 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 used.
Expansion connector can be divided by types of connections:
1. VDD
2. GND
3. Data connections
The VDD connection enables the user to connect/disconnect external and internal power source. This connection meets next
requirements:
• External power range: 1.8 - 5.5 V
• High resistance voltage dividers are not recommended
Figure 6. Internal Power Source
Figure 7. Internal Power Source for GreenPAK Chip and External Development Platform
