Arria II EP2AGX45CU17C6N power up failure.

Hi all,

I am using Arria II EP2AGX45CU17C6N FPGA in my PCIe interfacing card project, I had only one FPGA device mounted on PCB and power section.

Power voltage rail on PCB board

3.3V & 0.9 (sw_reg - Dual O\P)

|

2.5V (LDO)

| |

1.5 & 1.1V (LDO - Dual O\P)

On doing Initial power supply check in PCB only some FPGA VCC pins

Receives voltage Vccio = 3.3V , Vcc =0.9V ,Vccl_GXB=1.1V,VccH_GXB=1.5V

And VCCA=2.5V.

but other pins like vcca_pll(2.5v),vcc_pll(0.9v) and vccb(1.5v) are open

(isolated from getting powered by removing ferrite bead component on pcb)

At this point I measured Voltage rail, all voltage output are fine and as per expected (no Heat on FPGA and regulators)

After some time i mounted all the components and powered up the board

so that other VCC and PPL pins also receives voltage VCCA_PLL

(2.5V),VCC_PLL(0.9V) and VCCB(1.5V),At this time I found VCCB(1.5V)

Pins got shot to GND pin also 1.5V LDO and FPGA got heat. I switched of

Supply and check the impedance now VCCB pin of FPGA and GND Pin is

Short (Z = 0 ohm),

I came to know VCCB pin of FPGA got gone bad,

my query,

1. Can i connect only some FPGA VCC pin to respective voltage initially (not connecting PLL and VCCB pins,. connecting these PINs second time power on)?? Will devices pin go bad on second power up??

2. Should I connect all the power supply pin of FPGA including PLL and VCCB every time power up for device to work properly?? not to get spoil of any pins??

Note:-

Last option... I might have received fault\damage FPGA but it’s my last option getting bad FPGA chip from standard manufacturing is very least possibilities...