Power supplies – Digilent 410-138P-KIT User Manual
Page 8
Genesys Reference Manual
www.digilentinc.com
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I/O Expand
The I/O Expand tab works with an IP block in the
FPGA to provide additional simple I/O beyond the
physical devices found on the Genesys board.
Virtual I/O devices include a 24-LED light bar, 16
slide switches, 16 push buttons, 8 discrete LEDs,
a 32-bit register that can be sent to the FPGA,
and a 32-bit register that can be read from the
FPGA. The IP block, available in the Adept I/O
Expansion reference design
(AdeptIOExpansion.zip) on the Adept page of the
Digilent website, provides a simple interface with
well-defined signals. This IP block can easily be
included in, and accessed from, user-defined
circuits.
For more information, please see the Adept documentation available at the Digilent website.
Power Supplies
The Genesys board requires an external 5V 4A or greater power source with a coax center-positive
2.1mm internal-diameter plug (a suitable supply is provided as a part of the Genesys kit). Voltage
regulator circuits from Texas Instruments create the required 3.3V, 2.5V, 1.8V, 1.0V, and 0.9V
supplies from the main 5V supply. The table below provides additional information (typical currents
depend strongly on FGPA configuration; the values provided are typical of medium size/speed
designs).
The four main voltage rails on the Genesys board use TI INA219 power supply monitors to
continuously measure voltage, current, and power. Measured values may be viewed on a PC using
Digilent’s power meter that is a part of the Adept software.
Table 1: Genesys Power Supplies
Supply
Circuits
Device
Amps (max/typ)
3.3V
FPGA I/O, Video, RS-232, USB, Clocks, ROM, Audio
IC20: TPS54620 6A / 700mA
2.5V
FPGA Aux, VHDC, Ethernet PHY I/O, GPIO
IC21: TPS54620 6A / 400mA
1.0V
FPGA Core, Ethernet PHY core
IC25: TPS54620 6A / 0.8 – 1.2A
1.8V
DDR & FPGA DDR I/O
IC23: TPS54620 6A / 1A
0.9V
DDR SODIMM Termination Voltage (V
TT
)
IC22: TPS51100 3A / 1A