82C881 데이터 시트보기 (PDF) - Unspecified

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82C881

FireLink 1394 OHCI Link Controller

Unspecified 

FireLink 1394 OHCI

®

82C881

3.0 Signal Definitions

3.1 Terminology/Nomenclature Conventions

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 tables in this section use several common abbreviations. Table 3-1 lists the mnemonics and their meanings. Note that

TTL/CMOS/Schmitt-trigger levels pertain to inputs only. Outputs are driven at CMOS levels.

Table 1. Signal Definitions Legend

Mnemonic

Description

Analog

CMOS

Dcdr

Ext

G

I

Int

I/O

Mux

NIC

O

OD

P

PD

PU

S

S/T/S

TTL

Analog-level compatible

CMOS-level compatible

Decoder

External

Ground

Input

Internal

Input/Output

Multiplexer

No Internal Connection

Output

Open drain

Power

Pull-down resistor

Pull-up resistor

Schmitt-trigger

Sustain Tristate

TTL-level compatible

912-2000-031

Revision: 1.0

Page 3

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