CS89712 datasheet(165/170 Pages) CIRRUS

165 / 170 page

CS89712

DS502PP2

165

Units of Measurement

General Conventions

Hexadecimal numbers are presented with all letters

in uppercase and a lowercase “h” appended or with

a 0x at the beginning, for example, 0x14 and

03CAh. Binary numbers are enclosed in single

quotation marks when in text (for example, ‘11’

designates a binary number). Numbers not indicat-

ed by an “h”, 0x or quotation marks are decimal.

Registers are referred to by acronym, as listed in

the tables on the previous page, with bits listed in

brackets MSB-to-LSB separated by a colon (:) (for

example, CODR[7:0]), or LSB-to-MSB separated

by a hyphen (for example, CODR[0–2]).

“TBD” indicates values “to be determined,” “n/a”

designates “not available”, “n/c” indicates a “no

connect. pin” and “dc” means “don’t care”.

Ethernet port Definitions

•

Act-Once bit

Causes the Ethernet port to take a certain action

once when the bit is set. To cause the action

again, the software must rewrite a "1".

•

Committed Receive Frame

A receive frame is "committed" after the frame

has been buffered by the Ethernet port, and a re-

ceive interrupt has been generated.

•

Committed Transmit Frame

A transmit frame is "committed" after software

has issued a Transmit Command, and the Ether-

net port has reserved buffer space and notified

the software that it is ready for transmit.

•

Cyclic Redundancy Check

The method used to compute the 32-bit frame

check sequence.

•

Event or Interrupt Event

Refers to something that can trigger an inter-

rupt. Items that are considered "Events" are re-

ported in the three Event registers (RxEvent,

TxEvent, or BufEvent) and in two counter-

overflow bits (RxMISS and TxCOL).

•Frame

The portion of a packet from the DA to the

FCS. This includes the Destination Address

(DA), Source Address (SA), Length field, Data

field, pad bits (if necessary), and Frame Check

Sequence (FCS, also called CRC). "Frame da-

ta" refers to all data from the DA to the FCS to

be transmitted, or that has been received.

•

Frame Check Sequence

The 32-bit field at the end of a frame that con-

tains the cyclic redundancy check result.

•

Individual Address

The specific Ethernet address assigned to a de-

vice attached to the Ethernet media.

Symbol

Unit of Measure

°C

degree Celsius

hertz (cycle per second)

kbits/s

kilobits per second

kbyte

kilobyte (1,024 bytes)

kHz

kilohertz

Ω

kilohm

Mbps

megabits (1,048,576 bits) per second

Mbyte

megabyte (1,048,576 bytes)

MHz

megahertz (1,000 kilohertz)

µA

microampere

µFmicrofarad

µWmicrowatt

µs

microsecond (1,000 nanoseconds)

milliampere

milliwatt

millisecond (1,000 microseconds)

nanosecond

Vvolt

Wwatt

Table 94. Units of Measurement

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