CDPCLK4 datasheet(247/274 Pages) ALTERA

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CIII51011-3.4

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Cyclone III Device Handbook

Volume 1

July 2012

ISO

9001:2008

Registered

10. Hot-Socketing and Power-On Reset in

the Cyclone III Device Family

The Cyclone® III device family (Cyclone III and Cyclone III LS devices) offers

hot-socketing, which is also known as hot plug-in or hot swap, and power sequencing

support without the use of any external devices. You can insert or remove Cyclone III

device family or a board in a system during system operation without causing

undesirable effects to the running system bus or the board that is inserted into the

system.

The hot-socketing feature removes some of the difficulties that you encounter when

you use Cyclone III device family on a PCB that contains a mixture of 3.3, 3.0, 2.5, 1.8,

1.5, and 1.2 V devices. With the hot-socketing feature of Cyclone III device family, you

no longer need to ensure a proper power up sequence for each device on the board.

Cyclone III device family hot-socketing feature provides:

■

Board or device insertion and removal without external components or board

manipulation

■

Support for any power-up sequence

■

Non-intrusive I/O buffers to system buses during hot insertion

This chapter also describes the power-on reset (POR) circuitry in Cyclone III device

family. The POR circuitry keeps the devices in the reset state until the power supplies

are in operating range.

This chapter contains the following sections:

■

“Hot-Socketing Specifications” on page 10–1

■

“Hot-Socketing Feature Implementation” on page 10–3

■

“POR Circuitry” on page 10–3

Hot-Socketing Specifications

Cyclone III device family is a hot-socketing compliant without the need for any

external components or special design requirements. Hot-socketing support in

Cyclone III device family has the following advantages:

■

You can drive the device before power-up without damaging the device.

■

I/O pins remain tristated during power-up. The device does not drive out before

or during power-up, therefore not affecting other buses in operation.

July 2012

CIII51011-3.4

CDPCLK4 Scheda tecnica(PDF) 247 Page - Altera Corporation

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