cs89712 Cirrus Logic, Inc., cs89712 Datasheet - Page 165

• Manufacturer Part Number: cs89712
• Description: High-performance, Low-power System-on-chip With 10base-t Ethernet Controller
• Manufacturer: Cirrus Logic, Inc.

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”.
DS502PP2
Hz
kbits/s
kbyte
kHz
k
Mbps
Mbyte
MHz
mA
mW
ms
ns
V
W
C
A
F
W
s
Symbol
Table 94. Units of Measurement
degree Celsius
hertz (cycle per second)
kilobits per second
kilobyte (1,024 bytes)
kilohertz
kilohm
megabits (1,048,576 bits) per second
megabyte (1,048,576 bytes)
megahertz (1,000 kilohertz)
microampere
microfarad
microwatt
microsecond (1,000 nanoseconds)
milliampere
milliwatt
millisecond (1,000 microseconds)
nanosecond
volt
watt
Unit of Measure
Ethernet port Definitions
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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.
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