WARP FPGA Board Power Supplies

FPGA Power Supplies

The Virtex-II Pro FPGA has a number of different power inputs. The table below summarizes the power supplies on the WARP FPGA board.

Supply	Voltage	Description
VCC_INT	1.5v	FPGA core logic
VCC_AUX	2.5v	FPGA clock resources
VCC_O	3.3v	FPGA I/O banks
AVCCAUXRX	2.5v	MGT Rx logic
AVCCAUXTX	2.5v	MGT Tx logic
VTTX	2.5v	MGT Tx termination
VTRX	2.5v or 1.8v	MGT Rx termination

The WARP FPGA board uses switching power supplies for the 1.5 and 3.3v supplies. Both supplies are Texas Instruments' ​PTH12020W 18A DC-DC power modules.

The 2.5v VCC_AUX supply is a ​LT1963A linear regulator from Linear Technology.

The MGT supplies are all driven by linear supplies in order to minimize noise in the MGT circuitry. Two LT1963A linear regulators are used, one configured for 1.8v output, the other for 2.5v. The receive termination voltage (VTRX) for four MGTs can be configured for either 1.8v or 2.5v. Four 3-pin jumpers are used to select VTRX for MGTs 3, 4, 5 and 6. A 2-pin shunt should be mounted on each 3-pin jumper, shorting either the bottom two or top two pins of each jumper. Shorting the bottom two pins selects 2.5v; shorting the top two selects 1.8v. These jumpers should generally be configured for 2.5v.

Daughtercard Power Supplies

Hardware Figures

FPGA Power Supplies

MGT Power Supplies & Rx Termination Configuration