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ICS1892 Datasheet, PDF (11/148 Pages) Integrated Circuit Systems – 10Base-T/100Base-TX Integrated PHYceiver | |||
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ICS1892
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
Asterisk (*)
Bits
Code groups
Colon (:)
Numbers
Pin (or signal) names
Convention / Nomenclature
Within this table, see the item âPin (or signal) namesâ
⢠A bit in a register is identified using the format âregister.bitâ. 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 âSymbolsâ
Within this table, see these items:
⢠âBitsâ
⢠âPin (or signal) namesâ
⢠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:
â A âbâ represents a binary (base 2) number
â An âhâ represents a hexadecimal (base 16) number
â An âoâ 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 â/â is a multi-function, configuration
pin. These pins provide the ability to select between two ICS1892
functions. The name provided:
â Before the â/â indicates the pin name and function when the signal level
on the pin is logic zero.
â After the â/â 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.
â When the signal level on the HW/SW pin is logic zero, the ICS1892
Hardware mode is selected.
â When the signal level on the HW/SW pin is logic one, the ICS1892
Software mode is selected.
⢠An asterisk appended to the end of a pin name or signal name (such as
RESET*) 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.
ICS1892, Rev. D, 2/26/01
© 2000-2001, Integrated Circuit Systems, Inc.
All rights reserved.
11
February 26, 2001
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