UDIMM/SODIMM—PWR_EN and PWR_GOOD - UDIMM/SODIMM—PWR_EN and PWR_GOOD - 1.0 English - PG456

UDIMM and SODIMM modules use PWR_EN to enable the on-DIMM PMIC:

PWR_EN

PWR_EN connects to the VR_EN input of the DIMM PMIC. It must be driven HIGH (1.26V to 3.6V per JESD301-2 and JESD301-6) to initiate PMIC operation.

Sequence

Assert PWR_EN HIGH, then wait for PWR_GOOD to assert before releasing POR. The Versal device does not monitor PWR_GOOD—external board-level sequencing is required.

References

• JESD301-2
• JESD301-6