MMC2080 Datasheet, PDF (5/34 Pages) Motorola, Inc – Integrated Processor with Roaming FLEX Decoder

Conventions and Terminology
1.1 Conventions and Terminology
This document uses the following conventions:
• OVERBAR is used to indicate a signal that is active when pulled low: for example, RESET.
• Logic level one is a voltage that corresponds to Boolean true (1) state.
• Logic level zero is a voltage that corresponds to Boolean false (0) state.
• To set a bit or bits means to establish logic level one.
• To clear a bit or bits means to establish logic level zero.
• A signal is an electronic construct whose state or changes in state convey information.
• A pin is an external physical connection. The same pin can be used to connect a number of signals.
• Asserted means that a discrete signal is in active logic state.
— Active low signals change from logic level one to logic level zero.
— Active high signals change from logic level zero to logic level one.
• Deasserted means that an asserted discrete signal changes logic state.
— Active low signals change from logic level zero to logic level one.
— Active high signals change from logic level on to logic level zero.
• LSB means least significant bit or bits. MSB means most significant bit or bits. References to low
and high bytes or words are spelled out.
Please refer to the examples in Table 1.
Table 1. Data Conventions
Signal/Symbol
Logic State
Signal State
Voltage
PIN
True
Asserted
V_IL/V_OL
PIN
False
Deasserted
V_IH/V_OH
PIN
True
Asserted
V_IH/V_OH
PIN
False
Deasserted
V_IL/V_OL
Introduction
5
Preliminary