82375EB datasheet(14/131 Pages) INTEL

14 / 131 page

82375EBSB

20 SIGNAL DESCRIPTION

This section provides a detailed description of each signal The signals are arranged in functional groups

according to their associated interface

The ‘‘ ’’ symbol at the end of a signal name indicates that the active or asserted state occurs when the signal

is at a low voltage level When ‘‘ ’’ is not present after the signal name the signal is asserted when at the high

voltage level

The terms assertion and negation are used extensively This is done to avoid confusion when working with a

mixture of ‘‘active-low’’ and ‘‘active-high’’ signals The term assert or assertion indicates that a signal is

active independent of whether that level is represented by a high or low voltage The term negate or

negation

indicates that a signal is inactive

The following notations are used to describe the signal type

Input is a standard input-only signal

out

Totem Pole output is a standard active driver

Open Drain inputoutput

Tri-State is a bi-directional tri-state inputoutput pin

sts

Sustained Tri-State is an active low tri-state signal owned and driven by one and only one agent at a

time The agent that drives a sts pin low must drive it high for at least one clock before letting it float

A new agent can not start driving a sts signal any sooner than one clock after the previous owner tri-

states it An external pull-up is required to sustain the inactive state until another agent drives it and

must be provided by the central resource

82375EB Datasheet(PDF) 14 Page - Intel Corporation