AR# 52745: Virtex-4Q - Why do I see additional current draw when carrying out Readback operations?
AR# 52745
Virtex-4Q - Why do I see additional current draw when carrying out Readback operations?
Description
When carrying our readbackfor scrubbing operations on a Virtex-4Q device, I see that there is additional current draw on the Vccaux and Vccint supplies. What causes this current draw?
Solution
Accessing configuration logic to carry out Readback operations enables internal buses and logic in the device which contribute to current drawn. This is expected behavior. The current drawn is not characterized but should make a negligible contribution to overall power consumption.