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參數(shù)資料
| 型號： | CDK8920A |
| 廠商： | Cirrus Logic, Inc. |
| 英文描述： | CRYSTAL LAN ISA PLUG-AND-PLAY ETHERNET CONTROLLER |
| 中文描述： | 水晶藍的ISA即插即用，即插即用以太網(wǎng)控制器 |
| 文件頁數(shù)： | 30/144頁 |
| 文件大小： | 1229K |
| 代理商： | CDK8920A |
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Runt Frame:
If a frame is received that is
shorter than 64 bytes, the Runt bit (Register 4,
RxEvent, Bit D) is set. If the RuntA bit (Register
5, RxCTL, Bit D) is set, the frame will still be
buffered by CS8920A. If the RuntiE bit (Regis-
ter 3, RxCFG. Bit D) is set, the host is
interrupted.
Extra Data:
If a frame is received that is longer
than 1518 bytes, the Extradata bit (Register 4,
RxEvent, Bit E) is set. If the ExtradataA bit
(Register 5, RxCTL, Bit E) is set, the first 1518
bytes of the frame will still be buffered by
CS8920A. If the ExtradataiE bit (Register 3,
RxCFG. Bit E) is set, the host is interrupted.
Dribble Bits and Alignment Error:
Under nor-
mal operating conditions, the MAC may detect
up to 7 additional bits after the last full byte of a
receive packet. These bits, known as dribble bits,
are ignored. If dribble bits are detected, the Drib-
blebit bit (Register 4, RxEvent, Bit 7) is set. If
both the Dribblebit bit and CRCerror bit (Regis-
ter 4, RxEvent, Bit C) are set at the same time,
an alignment error has occurred.
Media Access Management
The Ethernet network topology is a single shared
medium with several attached stations. The Eth-
ernet protocol is designed to allow each station
equal access to the network at any given time.
Any node can attempt to gain access to the net-
work by first completing a deferral process
(described below) after the last network activity,
and then transmitting a packet that will be re-
ceived by all other stations. If two nodes
transmit simultaneously, a collision occurs and
the colliding packets are corrupted. Two primary
tasks of the MAC are to avoid network colli-
sions, and then recover from them when they
occur. In addition, when the CS8920A is using
the AUI, the MAC must support the SQE Test
function described in section 7.2.4.6 of the Eth-
ernet standard.
Collision Avoidance:
The MAC continually
monitors network traffic by checking for the
presence of carrier activity (carrier activity is in-
dicated by the assertion of the internal Carrier
Sense signal generated by the ENDEC). If car-
rier activity is detected, the network is assumed
busy and the MAC must wait until the current
packet is finished before attempting transmis-
sion. The CS8920A supports two schemes for
determining when to initiate transmission: Two-
Part Deferral, and Simple Deferral. Selection of
the deferral scheme is determined by the 2-part-
Transmit
Frame
Start Monitoring
Network Activity
IPG
Timer =
6.4
μ
s
Network
Active
Network
Active
Start IPG
Timer
Network
Active
Yes
No
Yes
Yes
Yes
No
No
No
No
Wait
3.2
μ
s
Yes
Tx
Frame
Ready andNot
in Backoff
Figure 3.7. Two-Part Deferral
CS8920A
30
DS238PP2
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