EP4SE360F35I4 Datasheet, PDF (331/432 Pages) Altera Corporation – This section provides a complete overview of all features relating to the Stratix IV device family, which is the most architecturlly advanced

February 2011
SIV51009-3.2
SIV51009-3.2
9. Hot Socketing and Power-On Reset in
Stratix IV Devices
This chapter describes hot-socketing specifications, power-on reset (POR)
requirements, and their implementation in Stratix^® IV devices.
Stratix IV devices offer hot socketing, also known as hot plug-in or hot swap, and
power sequencing support without the use of external devices. You can insert or
remove a Stratix IV device or a board in a system during system operation without
causing undesirable effects to the running system bus or board that is inserted into the
system.
The hot-socketing feature also removes some of the difficulty when you use Stratix IV
devices on PCBs that contain a mixture of 3.0-, 2.5-, 1.8-, 1.5-, and 1.2-V devices.
The Stratix IV hot-socketing feature provides:
■ Board or device insertion and removal without external components or board
manipulation
■ Support for any power-up sequence with the exception that V_CC must power up
fully before V_CCAUX for all Stratix IV production devices
■ I/O buffers non-intrusive to system buses during hot insertion
This section also describes POR circuitry in Stratix IV devices. POR circuitry keeps the
devices in the reset state until the power supply outputs are within operating range
(provided V_CC powers up fully before V_CCAUX).
This chapter contains the following sections:
■ “Stratix IV Hot-Socketing Specifications”
■ “Hot-Socketing Feature Implementation in Stratix IV Devices” on page 9–2
■ “Power-On Reset Circuitry” on page 9–3
■ “Power-On Reset Specifications” on page 9–4
Stratix IV Hot-Socketing Specifications
Stratix IV devices are hot-socketing compliant without the need for external
components or special design requirements. Hot-socketing support in Stratix IV
devices has the following advantages:
■ “Stratix IV Devices can be Driven Before Power Up” on page 9–2
■ “I/O Pins Remain Tri-Stated During Power Up” on page 9–2
■ “Insertion or Removal of a Stratix IV Device from a Powered-Up System” on
page 9–2
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Stratix IV Device Handbook
Volume 1
February 2011
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