EP2S30F484C4N Datasheet, PDF (131/238 Pages) Altera Corporation – Section I. Stratix II Device Family Data Sheet

4. Hot Socketing &
Power-On Reset
SII51004-3.2
Stratix II
Hot-Socketing
Specifications
Stratix^® II devices offer 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 a Stratix II board in a system
during system operation without causing undesirable effects to the
running system bus or the board that was inserted into the system.
The hot socketing feature also removes some of the difficulty when you
use Stratix II devices on printed circuit boards (PCBs) that also contain a
mixture of 5.0-, 3.3-, 2.5-, 1.8-, 1.5- and 1.2-V devices. With the Stratix II hot
socketing feature, you no longer need to ensure a proper power-up
sequence for each device on the board.
The Stratix II 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 discusses the power-on reset (POR) circuitry in Stratix II
devices. The POR circuitry keeps the devices in the reset state until the
V_CC is within operating range.
Stratix II devices offer hot socketing capability with all three features
listed above without any external components or special design
requirements. The hot socketing feature in Stratix II devices allows:
■ The device can be driven before power-up without any damage to
the device itself.
■ I/O pins remain tri-stated during power-up. The device does not
drive out before or during power-up, thereby affecting other buses in
operation.
■ Signal pins do not drive the V_CCIO, V_CCPD, or V_CCINT power supplies.
External input signals to I/O pins of the device do not internally
power the V_CCIO or V_CCINT power supplies of the device via internal
paths within the device.
Altera Corporation
4–1
May 2007