ICS1893AG データシートの表示（PDF） - Integrated Circuit Systems

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ICS1893AG

3.3 V 10Base-T/100Base-TX Integrated PHYceiver™

Integrated Circuit Systems 

ICS1893AG Data Sheet - Preliminary

Chapter 2 Conventions and Nomenclature

Chapter 2 Conventions and Nomenclature

Table 2-1 lists and explains the conventions and nomenclature used throughout this data sheet.

Table 2-1. Conventions and Nomenclature

Item

Bits

Code groups

Colon (:)

Numbers

Pin (or signal) names

Registers

Convention / Nomenclature

• A bit in a register is identified using the format ‘register.bit’. For example, bit

0.15 is bit 15 of register 0.

• When a colon is used with bits, it indicates the range of bits. For example,

bits 1.15:11 are bits 15, 14, 13, 12, and 11 of register 1.

• For a range of bits, the order is always from the most-significant bit to the

least-significant bit.

Within this table, see the item ‘Symbols’

Within this table, see these items:

• ‘Bits’

• ‘Pin (or signal) names’

• As a default, all numbers use the decimal system (that is, base 10) unless

followed by a lowercase letter. A string of numbers followed by a lowercase

letter:

– A ‘b’ represents a binary (base 2) number

– An ‘h’ represents a hexadecimal (base 16) number

– An ‘o’ represents an octal (base 8) number

• All numerical references to registers use decimal notation (and not

hexadecimal).

• All pin or signal names are provided in capital letters.

• A pin name that includes a forward slash ‘/’ is a multi-function, configuration

pin. These pins provide the ability to select between two ICS1893AG

functions. The name provided:

– Before the ‘/’ indicates the pin name and function when the signal level

on the pin is logic zero.

– After the ‘/’ indicates the pin name and function when the signal level on

the pin is logic one.

For example, the HW/SW pin selects between Hardware (HW) mode and

Software (SW) mode. When the signal level on the HW/SW pin is logic:

– Zero, the ICS1893AG Hardware mode is selected.

– One, the ICS1893AG Software mode is selected.

• An ‘n’ appended to the end of a pin name or signal name (such as

RESETn) indicates an active-low operation.

• When a colon is used with pin or signal names, it indicates a range. For

example, TXD[3:0] represents pins/signals TXD3, TXD2, TXD1, and TXD0.

• When pin name abbreviations are spelled out, words in parentheses

indicate additional description that is not part of the pin name abbreviation.

• A bit in a register is identified using the format ‘register.bit’. For example, bit

0.15 is bit 15 of register 0.

• All numerical references to registers use decimal notation (and not

hexadecimal).

• When register name abbreviations are spelled out, words in parentheses

indicate additional description that is not part of the register name

abbreviation.

ICS1893AG, Rev A 04/14/05

Copyright © 2005, Integrated Circuit Systems, Inc.

All rights reserved.

April, 2005

12

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