CS89712 datasheet(166/170 Pages) CIRRUS

166 / 170 page

CS89712

166

DS502PP2

•

Inter-Packet Gap

Time interval between packets on the Ethernet.

Minimum interval is 9.6 ms.

•

Jabber

A condition that results when an Ethernet node

transmits longer than between 20 ms and

150 ms.

•

Packet

The entire serial string of bits transmitted over

an Ethernet network. This includes the pream-

ble, Start-of-Frame Delimiter, Destination Ad-

dress, Source Address, Length field, Data field,

pad bits (if necessary), and Frame Check Se-

quence (FCS, also called CRC). A packet is a

frame plus the Preamble and SFD.

•

Slot Time

Time required for an Ethernet Frame to cross a

maximum length Ethernet network. One Slot

Time equals 512 bit times.

•

Suspend

Used to conserve power. When in Suspend

mode, the Ethernet port can be awakened only

by software command.

•Transfer

Moving frame data across the memory bus

from the Ethernet port RAM to system RAM.

During receive operations, only frame data are

transferred (preamble and SFD are stripped off

by the CS89712’s MAC engine). The FCS may

or may not be transferred, depending on the

configuration. Transfers are counted in bytes.

•

Transmit Collision

The receive inputs, RXD+/RXD- (10BASE-T)

are active while a packet is being transmitted.

•

Transmit Request

A Transmit Request is issued by the software to

initiate the start of a new packet transmission.

Suffixes Specific to the Ethernet port

These have meaning only at the end of a term:

CMD

Command

CFG

Configure

CTL

Control

Dis

Disable

Enable

Indicates the number is hexadecimal

Interrupt Enable

Status

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