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Document Reference No.: FT_000198
MORPH-IC-II Datasheet
Version 1.04
Clearance No.: FTDI# 164
3.3 Morph-IC-II Signal Levels Supported.
Morph-IC-II provides a flexible method to process signals of different voltage levels. This method allows a
voltage of either 3.3V, 2.5V, 1.8V or 1.5V to be applied to I/O Bank 4 by adjusting the externally
supplied power supply to bank 4 and reconfiguring the pin-map. This means Morph-IC-II supports the
different voltage levels on different banks as shown in Fig. 3.
As illustrated in Fig. 3 I/O Banks 1 – 3 can only process 3.3V TTL and CMOS signals. Other voltage levels
are not supported on these I/O banks since signal lines between FT2232H and FPGA are connected to
these I/Os. Therefore a 3.3V power supply is hardwired to the voltage supplies of I/O Bank 1-3.
A step by step example of how to modify the I/O signal levels of I/O Bank 4 is given in a separate
applications note “ AN_141_MorphIO-II and MorphLd Utilities for Morphic- II”. T his can be downloaded
from the FTDI website.
3V3
I/O Bank 2
All I/O Banks Support
3.3-V LVTTL/LVCMOS
3V3
I/O Bank 1
Only I/O Bank 4 Support
I/O Bank 3
2.5-V LVTTL/LVCMOS
1.8-V LVTTL/LVCMOS
1.5-V LVCMOS
3V3
Individual
Power Bus
1V5 / 1V8 / 2V5 /3V3
I/O Bank 4
Fig. 3 – I/O Bank Logic Voltage Levels
Copyright ? 2010 Future Technology Devices International Limited
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