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Altera_Forum's avatar
Altera_Forum
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10 years ago

DDR2 VREF problem

Hi, My FPGA design uses 4 ddr2 devices. And I use LP2996 to output VTT and VREF for FPGA and DDR2. However, VREF measures 1.43V other than 0.9V. After I cut the VREF output trace, I found LP299...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

I'm not sure either, but if you can lift a pin and add a jumper on the LP2996 you can run a quick test.