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參數(shù)資料
| 型號： | 9880 |
| 廠商： | Intel Corp. |
| 英文描述： | Advanced 10/100 Repeater with Intergrated Management |
| 中文描述： | 高級10/100中繼器與綜合管理 |
| 文件頁數(shù)： | 35/118頁 |
| 文件大?。?/td> | 1648K |
| 代理商： | 9880 |
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Advanced 10/100 Repeater with Integrated Management
—
LXT9860/9880
Datasheet
Document #: 248987
Revision#: 003
Rev Date: 08/07/01
35
Address assignment is provided via one of two arbitration mechanisms which are activated
whenever the device is powered up or reset/reconfigured. Refer to
“
Serial Management I/F
”
on
page 52
.
3.3.4
Serial PROM Interface
The serial PROM interface allows the loading of optional information unique to each board. Items
such as serial number or date of manufacture can be placed in the serial PROM, which is also used
in the address arbitration process. See
“
Serial PROM Interface
”
on page 59
.
3.4
Repeater Operation
The LXT98x0 contains two internal repeater state machines
—
one operating at 10 Mbps and the
other at 100 Mbps. The LXT98x0 automatically switches each port to the correct repeater, once the
operational state of that port has been determined. Each repeater connects all ports configured to
the same speed (including the MII), and the corresponding Inter-Repeater Backplane. Both
repeaters perform the standard jabber and partition functions.
3.4.1
100 Mbps Repeater Operation
The LXT98x0 contains a complete 100 Mbps Repeater State Machine (100RSM) that is fully IEEE
802.3 Class II compliant. Any port configured for 100 Mbps operation is automatically connected
to the 100 Mbps Repeater. This includes any of the eight media and two MII ports configured for
100 Mbps operation.
The 100 Mbps RSM has its own Inter-Repeater Backplane (100IRB). Multiple LXT98x0s can be
cascaded on the 100IRB and operate as one repeater segment. Data from any port is forwarded to
all other ports in the cascade. The 100IRB is a 5-bit symbol-mode interface. It is designed to be
stackable.
The LXT98x0 maintains a complete set of statistics for its local 100 Mbps repeater segment. These
are accessible through the high-speed serial management interface.
The LXT98x0 performs the following 100 Mbps repeater functions:
Signal amplification, wave-shape restoration, and data-frame forwarding.
SOP, SOJ, EOP, EOJ delay < 46BT; class II compliant.
Collision Enforcement. During a 100 Mbps collision, the LXT98x0 drives a 0101 jam signal
(encoded as Data 5 on TX links) to all ports until the collision ends. There is no minimum
enforcement time.
Partition. The LXT98x0 partitions any port that participates in excess of 60 consecutive
collisions or one long collision approximately 575.2
μ
s long. Once partitioned, the LXT98x0
monitors and transmits to the port, but does not repeat data received from the port until it un-
partitions.
Un-partition. The LXT98x0 supports two un-partition algorithms:
—
The alternative un-partition algorithm (default), which complies with IEEE specification
802.3aa un-partitions a port on
either
transmit or receive of at least 450-560 bits without
collision.
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