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Part 4: FPGA Power Supply

In order for FGPA to work properly, we need to provide 3.3V, 1.8V, 2.5V,

1.2V and VCCIO five-way power for the FPGA. Let's talk about the power pin

portion of the FPGA, which includes the power pins for each bank, the core

voltage pins, the analog voltage, and the phase-locked loop power supply pins.

VCCINT is the FPGA core power supply pin, connected to 1.2V; VCCIO

is the power supply voltage of each BANK of the FPGA, where VCCIO1 is the

power supply pin of the BANK1 of the FPGA. Similarly, VCCIO2~VCCIO8 are

the power supply of the BANK2~BANK8 of the FPGA respectively. In the

AC4040 core board, VCCIO3 and VCCIO4 are connected to 1.8V, because

BANK3 and BANK4 are IOs connected to DDR2. The other BANK (BANK1~2,

BANK5~8) voltages are connected to the adjustable VCCIO, which enables the

BANK IO voltage of the FPGA to be flexibly adjusted. By adjusting the

resistance value of the VCCIO power supply part, different output voltages are

obtained, so that the FPGA core The board's IO level can be applied to different

voltages (the default VCCIO voltage is 3.3V). In addition, with DDR2 on the

core board, a termination power supply VTT and a reference power supply

VREF for DDR2 are required.

The power supply (VCCIO, 1.2V, 1.8V) with three large current

requirements on the FPGA development board adopts the TLV62130RGT

DCDC chip imported from TI Company of the United States. It has high

efficiency, small size, no heat, can provide large current, small ripple, etc. It is

an excellent power solution for FPGA; a large number of high-grade imported

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ALINX ALTERA Core Board AC4075 User Manual

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