ECP5 SERDES interface. The input clock source for the reference clock generation circuit can be onboard oscillator or the PLL output from ECP5 FPGA which can be selected by the ref_sel input of the ispClock5406D.
Figure 5.1 shows the power supply block of the ECP5 VIP processor board. The Mini-B USB connector is used only for programming and the external power adaptor must be connected to source power for the on board regulators for the normal operation and successful programming.
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