Altera MAX 10 Power Manuel d'utilisateur télécharger pdf (Page 13)

Figure 2-7: Hot-Socketing Circuitry for MAX 10 Devices

CCIO

PAD

Voltage

Tolerance

Control

Output Enable

Hot-Socket

Output

Pre-Driver

Power-On

Reset (POR)

Monitor

Weak

Pull-Up

Resistor

Input Buffer

to Logic Array

The POR circuit monitors the voltage level of power supplies and keeps the I/O pins tri-stated until the

device is in user mode. The weak pull-up resistor in MAX 10 device I/O elements (IOE) keeps the I/O

pins from floating. The voltage tolerance control circuit protects the I/O pins from being driven before

CCIO

and V

supplies are powered up. This prevents the I/O pins from driving out when the device is

not in user mode.

Altera uses GND as reference for hot-socketing operation and I/O buffer designs. To ensure proper

operation, Altera recommends connecting the GND between boards before connecting the power

supplies. This prevents the GND on your board from being pulled up inadvertently by a path to power

through other components on your board. A pulled up GND can cause an out-of-specification I/O voltage

or current condition with the Altera device.

2-10

Hot-Socketing Feature Implementation

UG-M10PWR

2015.02.09

Altera Corporation

MAX 10 Power Management Features and Architecture

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Altera MAX 10 Power Manuel d'utilisateur Page 13