Cyclone® 10 GX Core Fabric and General Purpose I/Os Handbook

ID 683775
Date 7/08/2024
Public
Document Table of Contents

10.7.1. Power-Up Sequence Requirements for Cyclone® 10 GX Devices

The power rails in Cyclone® 10 GX devices are each divided into three groups. Refer to the Cyclone® 10 GX Device Family Pin Connection Guidelines and the AN 692: Power Sequencing Considerations for Cyclone® 10 GX, Arria® 10, and Stratix® 10 Devices for additional details.

The diagram below illustrates the voltage groups of the Cyclone® 10 GX devices and their required power-up sequence.

Figure 183. Power-Up Sequence for Cyclone® 10 GX Devices


Note: VCCBAT is not in any of the groups below. VCCBAT does not have any sequence requirements. VCCBAT holds the contents of the security keys.
Table 100.  Voltage Rails
Power Group Cyclone® 10 GX Power Supplies
Group 1

VCC

VCCP

VCCERAM

VCCR_GXB

VCCT_GXB

Group 2

VCCPT

VCCH_GXB

VCCA_PLL

Group 3

VCCPGM

VCCIO

All power rails in Group 1 must ramp up (in any order) to a minimum of 90% of their respective nominal voltage before the power rails from Group 2 can start ramping up.

The power rails within Group 2 can ramp up in any order after the last power rail in Group 1 ramps to the minimum threshold of 90% of its nominal voltage. All power rails in Group 2 must ramp to a minimum threshold of 90% of their nominal value before the Group 3 power rails can start ramping up.

The power rails within Group 3 can ramp up in any order after the last power rail in Group 2 ramps up to a minimum threshold of 90% of their full value.

For Cyclone® 10 GX devices, you can combine and ramp up Group 3 power rails with Group 2 power rails if the two groups share the same voltage level and the same voltage regulator as Group 2 power rail VCCPT.

Note: Ensure that the newly combined power rails do not cause any driving of unpowered GPIO or transceiver pins.

All power rails must ramp up monotonically. The power-up sequence should meet either the standard or the fast Power On Reset (POR) delay time. The POR delay time depends on the POR delay setting you use. For the POR specifications of the Cyclone® 10 GX devices, refer to the POR Specifications section in the Cyclone® 10 GX Device Datasheet.

The power-up sequence must meet either the standard or fast POR delay time depending on the POR delay setting you use.