82378ZB Просмотр технического описания (PDF) - Intel

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82378ZB

82378ZB SYSTEM I/O (SIO) AND 82379AB SYSTEM I/O APIC (SIO.A)

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82378ZB (SIO) AND 82379AB (SIO.A)

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2.0. SIGNAL DESCRIPTION

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

according to the interface.

Note that 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 described the signal type.

Signal Type

Description

I

Input is a standard input-only signal.

O

Totem Pole Output is a standard active driver.

OD

Open Drain Input/Output.

IO

Input/Output is a bidirectional, tri-state pin.

s/t/s

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 s/t/s pin low must drive it high for at least one clock

before letting it float. A new agent can not start driving a s/t/s signal any sooner than one clock

after the previous owner tri-states it. A pull-up sustains the inactive state until another agent

drives it and is provided by the central resource.

t/s/o

Tri-State Output

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