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The voltage direction of the power rails is from board and on-board connectors' view:

Module Connector (B2B) DesignatorVCC / VCCIODirectionPinsNotes
JM1

3.3V

Out

97, 99

3.3V module supply voltage
3.3V_OUTIn833.3V module output voltage
VCCIO34Out61PL IO-bank VCCIO
JM2

1.8V

In

18

1.8V module output voltage
3.3V_OUTOut543.3V module output voltage
V_CFG0In53Internal module VCCIO: 3.3V or 1.8V

Table 16: Power pin description of B2B module connector.

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