CS8900A
Crystal LAN™ ISA Ethernet Controller
9.2 Definitions
Cyclic Redundancy Check
The method used to compute the 32-bit frame check sequence (FCS).
Frame Check Sequence
The 32-bit field at the end of a frame that contains the result of the cyclic redundancy check
(CRC).
Frame
An Ethernet string of data bits that includes the Destination Address (DA), Source Address
(SA), optional length field, Logical Link Control data (LLC data), pad bits (if needed) and
Frame Check Sequence (FCS).
Individual Address
The specific Ethernet address assigned to a device attached to the Ethernet media.
Inter-Packet Gap
Time interval between packets on the Ethernet. Minimum interval is 9.6 ms.
Jabber
A condition that results when a Ethernet node transmits longer than between 20 ms and 150
ms.
Packet
An Ethernet string of data bits that includes the Preamble, Start-of-Frame Delimiter (SFD),
Destination Address (DA), Source Address (SA), optional length field, Logical Link Control
data (LLC data), pad bits (if needed) and Frame Check Sequence (FCS). A packet is a frame
plus the Preamble and SFD.
Receive Collision
A receive collision occurs when the CI+/CI- inputs are active while a packet is being received.
Applies only to the AUI.
Signal Quality Error
When transmitting on the AUI, the MAC expects to see a collision signal on the CI+/CI- pair
within 64 bit times after the end of a transmission. If no collision occurs, there is said to be an
"SQE error". Applies only to the AUI.
Slot Time
Time required for an Ethernet Frame to cross a maximum length Ethernet network. One Slot
Time equals 512 bit times.
Transmit Collision
A transmit collision occurs when the receive inputs, RXD+/RXD- (10BASE-T) or CI+/CI-
(AUI) are active while a packet is being transmitted.
CIRRUS LOGIC PRODUCT DATA SHEET
DS271PP3
124
CIRRUS [ CIRRUS LOGIC ]
