Intel Cyclone 10 LP Device Design Guidelines

ID 683861
Date 3/28/2019
Public
Document Table of Contents

Device Power-Up

Table 21.  Device Power-Up Checklist
Number Done? Checklist Item
1   Design board for power-up: All Intel® Cyclone® 10 LP GPIO pins are tri-stated until the device is configured and the configuration pins drive out.
2   Design voltage power supply ramps to be monotonic.
3   Set POR time to ensure power supplies are stable.

Intel® Cyclone® 10 LP device I/O pins are hot-socketing compliant without external components. You can insert or remove a Intel® Cyclone® 10 LP device from a powered-up system board without damaging or interfering with normal system and board operation.

You can drive signals into the I/O pins before or during power up or power down without damaging the device. Intel® Cyclone® 10 LP devices support power up or power down of the VCCINT, VCCA, and VCCIO pins in any sequence to simplify the system level design. The individual power supply ramp-up and ramp-down rates can range from 50 µs to 50 ms. The power ramp must be monotonic.

In a hot-socketing situation, the Intel® Cyclone® 10 LP device’s output buffers are turned off during system power up or power down. Also, the Intel® Cyclone® 10 LP device does not drive out until the device is configured and working within the recommended operating conditions.

Hot-socketing circuitry is not available on CONF_DONE, nCEO, and nSTATUS configuration pins because they are required during configuration. Therefore, it is expected behavior for these pins to drive out during power-up and power-down sequences.

The POR circuit keeps the entire system in reset until the power supply voltage levels have stabilized after power up. After power up, the device does not release nSTATUS until VCCINT, VCCA, and VCCIO for the I/O banks that contain configuration pins are above the POR trip point of the device. After power down, brown-out occurs if the VCCINT or VCCA voltage sags below the POR trip point. In Intel® Cyclone® 10 LP devices, you can select a fast or standard POR time, depending on the MSEL pin settings. The fast POR time is 3 ms < TPOR < 9 ms for a fast configuration time. The standard POR time is 50 ms < TPOR < 200 ms, which has a lower power-ramp rate.

When power is applied to a Intel® Cyclone® 10 LP device, a POR event occurs if the power supply reaches the recommended operating range within a certain period of time (specified as a maximum power supply ramp time; tRAMP). The maximum power supply ramp time for Intel® Cyclone® 10 LP devices is 50 ms for standard POR or 3 ms for fast POR, while the minimum power supply ramp time is 50 µs.