Spectrum Digital TMS320DM642, Technical Reference

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Spectrum Digital, Inc
1-7
1.6 Power Supply
The EVM operates from a 5V external power supply connected to the main
power input (J5) or from the PCI slot. Internally, the +5V input is converted into +1.4V
and +3.3V using Texas Instruments swift voltage regulators. The +1.4V supply is used
for the DSP core while the +3.3V supply is used for the DSP's I/O buffers and all other
chips on the board. The power connector is a 2.5mm barrel-type plug. LDO voltage
regulators are used to generate the FPGA core voltage, and video input and output
voltages.
There are five power test points on the EVM at TP4, TP8, TP13, TP15, and TP16.
These test points provide a convenient mechanism to check the EVM’s multiple power
supplies. The table below shows the voltages for each test point and what the supply is
used for.
Table 4: Power Test Points
Test Point Voltage Voltage Use
TP4 +1.4 V DSP Core
TP8 +3.3 V DSP I/O and logic
TP13 +1.8 V FPGA
TP15 +3.3 V Video encoder
TP16 +1.8 V Video decoder