參數(shù)資料
型號： LXT9860HC
英文描述： Controller Miscellaneous - Datasheet Reference
中文描述： 控制器雜項(xiàng)-數(shù)據(jù)表參考
文件頁數(shù)： 27/96頁
文件大?。?/td> 1309K
代理商： LXT9860HC
LXT980/980A Dual-Speed, 5-Port Fast Ethernet Repeater
Datasheet
27
On the LXT980, the MII always operates as a nibble-wide (4B) interface. Symbol mode (5B
interface) is not supported on the LXT980 MII.
2.1.3.4
Serial Management Interface
The Serial Management Interface (SMI) provides system access to the status, control and statistic
gathering abilities of the LXT980. This interface is designed to allow multiple devices to be
managed from a single multi-drop (daisy-chain) connection, and to use the minimum number of
signals (2) for ease of system design.
The interface itself consists of two digital NRZ signals
—
clock and data. Refer to
Table 7 on
page 15
for serial management I/F pin assignments and signal descriptions. Data is framed into
HDLC-like packets, with a start/stop flag, header and CRC field for error checking. Zero-bit
insertion/removal is used. The interface can operate at any speed from 0 to 2 Mbps.
Address assignment is provided via one of two arbitration mechanisms which are activated
whenever the device is powered up or reset/reconfigured. Refer to the section
“
Serial Management
I/F
”
on page 40
.
2.1.4
Repeater Operation
The LXT980 contains two internal repeater state machines
—
one operating at 10 Mbps and the
other at 100 Mbps. The LXT980 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, partition, and isolate functions as required.
2.1.4.1
100 Mbps Repeater Operation
The LXT980 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 four media ports if they are configured for
100TX or 100FX operation, and the MII port if it is configured for 100 Mbps operation.
The 100 Mbps RSM has its own Inter-Repeater Backplane (100IRB). Multiple LXT980s can be
cascaded on the 100IRB and operate as one repeater segment. Data from any port will be
forwarded to any other port in the cascade. The 100IRB is a 5-bit symbol-mode interface. It is
designed to be stackable.
The LXT980 maintains a complete set of statistics for its local repeater segment as long as the MII
port is configured for 100 Mbps operation. These are accessible through the high-speed
management interface.
The LXT980 performs the following 100 Mbps repeater functions:
Signal amplification, wave-shape restoration, and data-frame forwarding.
Handling of received code violations. The LXT980 will substitute the
“
H
”
symbol for all
invalid received codes.
SOP, SOJ, EOP, EOJ delay < 46BT; class II compliant (see
Figure 26
).
Collision Enforcement. During a 100 Mbps collision, the LXT980 drives a 1010 jam signal
(encoded as Data 5 on TX links) to all ports until the collision ends. There is no minimum
enforcement time.
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