Digilent Eclypse Z7 Hardware Reference Manual page 13

The Platform MCU (PMCU) enumerates the SYZYGY ports and determines the power
needs of each Zmod installed in the system. The 5V power budget of the Eclypse is
then determined based on the needs of each Zmod, as well as the USB OTG VBUS,
RGB LEDs, and Fan. Table 1.2.2 describes the 5V power budget of the Eclypse Z7 in
more detail.
Table 1.2.2: Eclypse 5V Power Budget
Device or Connector
RGB LEDs
USB OTG VBUS
Zmod Port A
Zmod Port B
Case Fan
The two SYZYGY ports share a budget of 2A from the 3.3V supply. The two Pmod ports
share a budget of 0.5A, which is allocated to the SYZYGY ports if no Pmods are
installed.
Due to the requirements of the custom power sequencer (IC29), Digilent recommends
that peripheral modules (Pmods and Zmods) attached to and powered by the Eclypse
meet the specifications described in Table 1.2.3.
Table 1.2.3: Recommended Maximum Additional Capacitance for Add-on Modules
Port
Zmod Port A
Zmod Port A
Rail
VCC5V0
VCC3V3
Max Current (mA)
124.8
500
1000
1000
250
Max Capacitance (µF)
500
500