The recommended power-on sequence is VCCINT, VCCINT_IO/VCCBRAM , VCCAUX/VCCAUX_IO, and VCCO to achieve minimum current draw and ensure that the I/Os are 3-stated at power-on. The recommended power-off sequence is the reverse of the power-on sequence. If VCCINT and VCCINT_IO/VCCBRAM have the same recommended voltage levels, they can be powered by the same supply and ramped simultaneously. VCCINT_IO must be connected to VCCBRAM. If VCCAUX/VCCAUX_IO and VCCO have the same recommended voltage levels, they can be powered by the same supply and ramped simultaneously. VCCAUX and VCCAUX_IO must be connected together. VCCADC and VREF can be powered at any time and have no power-up sequencing requirements.
For devices with HBM, the HBM power supplies can be powered on/off after or in-parallel with the core power supplies. The required power-on sequence is VCCAUX_HBM and VCCINT_IO followed by VCC_HBM/VCC_IO_HBM. VCC_IO_HBM must be connected to VCC_HBM. VCCAUX_HBM must be equal to or higher than VCC_HBM at all times. The recommended power-off sequence is the reverse of the power-on sequence.
The recommended power-on sequence to achieve minimum current draw for the GTY or GTM transceivers is VCCINT, VCCINT_GT, VMGTAVCC, VMGTAVTT OR VMGTAVCC, VCCINT, VCCINT_GT, VMGTAVTT. There is no recommended sequencing for VMGTVCCAUX. Both VMGTAVCC and VCCINT can be ramped simultaneously. When VCCINT and VCCINT_GT have the same recommended operating conditions, VCCINT and VCCINT_GT can be connected to the same power regulation circuit. When VCCINT and VCCINT_GT are connected to separate regulation circuits, VCCINT_GT must be within the recommended operating condition before device configuration.The recommended power-off sequence is the reverse of the power-on sequence to achieve minimum current draw. If these recommended sequences are not met, current drawn from VMGTAVTT can be higher than specifications during power-up and power-down.