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參數(shù)資料
| 型號： | 9883 |
| 廠商： | Intel Corp. |
| 英文描述： | Advanced 10/100 Umnmanaged Repeater |
| 中文描述： | 高級10/100 Umnmanaged直放站 |
| 文件頁數(shù)： | 20/56頁 |
| 文件大?。?/td> | 719K |
| 代理商： | 9883 |
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LXT9883/9863
—
Advanced 10/100 Unmanaged Repeater
20
Datasheet
Document #: 249115
Revision #: 003
Rev. Date: 08/07/01
Un-partition. The un-partition algorithm, which complies with IEEE specification 802.3aa, un-
partitions a port on
either
transmit or receive of at least 450-560 bits without collision.
Isolate. The LXT98x3 isolates any port receiving more than two successive false carrier
events. A false carrier event is a packet that does not start with a /J/K symbol pair.
Un-isolate. The LXT98x3 un-isolates a port that remains in the IDLE state for 33000 +/- 25%
BT or that receives a valid frame at least 450-500 BT in length.
Jabber. The LXT98x3 ignores any receiver remaining active for more than 57,500 bit times.
The LXT98x3 exits this state when either one of the following conditions is met:
—
On power-up reset
—
When carrier is no longer detected
3.4.2
10 Mbps Repeater Operation
The LXT98x3 contains a complete 10 Mbps Repeater State Machine (10RSM) that is fully IEEE
802.3 compliant. Any port configured for 10 Mbps operation is automatically connected to the
10 Mbps Repeater. This includes any of the media and MII ports configured for 10 Mbps operation.
The 10RSM has its own Inter-Repeater Backplane (10IRB). Multiple LXT98x3s can be cascaded
on the 10IRB and operate as one repeater segment. Data from any port is forwarded to all other
ports in the cascade.
The LXT98x3 performs the following 10 Mbps repeater functions:
Signal amplification, wave-shape restoration, and data-frame forwarding.
Preamble regeneration. All outgoing packets have a minimum 56-bit preamble and 8-bit SFD.
SOP, SOJ, EOP, EOJ delays meet IEEE 802.3 section 9.5.5 and 9.5.6 requirements.
Collision Enforcement. During a 10 Mbps collision, the LXT98x3 drives a jam signal
(
“
1010
”
) to all ports for a minimum of 96 bit times until the collision ends.
Partition. The LXT98x3 partitions any port in excess of 31 consecutive collisions. Once
partitioned, the LXT98x3 continues monitoring and transmitting to the port, but does not
repeat data received from the port until it properly un-partitions. (Also partitions for excessive
collision length.)
Un-partition. The algorithm, which complies with the IEEE 802.3 specification, un-partitions
a port when data can be either received or transmitted from the port for 450-560 bit times
without a collision on that port.
Jabber. The LXT98x3 asserts a minimum-IFG idle period when a port transmits for longer
than 40,000 to 75,000 bit times.
3.5
Requirements
3.5.1
Power
The LXT98x3 has four types of +3.3V power supply input pins: two digital (VCC, GND) and two
analog (VCCR, VCCT). These inputs may be supplied from a single source. Ferrite beads should
be used to separate the analog and digital planes. These supplies should be clean.
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