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Chapter 2

Conventions and Nomenclature

ICS1893 Rev C 6/6/00

June, 2000

ICS1893 - Release

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

Convention / Nomenclature

Bits

• 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.

Code groups

Within this table, see the item ‘Symbols’

Colon (:)

Within this table, see these items:

• ‘Bits’

• ‘Pin (or signal) names’

Numbers

• 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).

Pin (or signal) names

• 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 ICS1893

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 ICS1893 Hardware mode is selected.

– One, the ICS1893 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.

Registers

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

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