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The most common VCCO voltages (for IOBs) are 1.2, 1.5, 1.8, 2.5, 3.3, or even 5V in legacy systems. The current can range from 1 to 20A. The typical auxiliary voltage (VCCAUX) is 3.3 or 2.5V. It powers time-critical resources in the FPGA, so it is susceptible to power-supply noise. VCCAUX can share a power plane with VCCO, but only if VCCO does not have excessive noise.
PTM Published on: 2009-11-10
Austria