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參數資料
| 型號： | W89C880F |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 通信及網絡 |
| 英文描述： | 100Base-Tx/T4 Multiport Repeater Controller(100Base-Tx/T4多端口中繼器控制器) |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PQFP160 |
| 封裝： | PLASTIC, QFP-160 |
| 文件頁數： | 17/26頁 |
| 文件大小： | 313K |
| 代理商： | W89C880F |
W89C880F FastMPR
Publication Release Date: January 1997
- 17 -
Revision A1
Continued
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Network Utilization vs LED Status
Calculation window |------|------|------|------|------|------|------|------|------|------|------|------|------|------|------|------|------|
Utilization Result 0 100 100 100 100 100 80 80 80 80 90 60 0 0 0 0 0 0
Utilization Report 0 10 20 30 40 50 60 70 80 80 90 80 70 60 50 40 30 20
(smoothly rise)
(halt)
(smoothly drop)
(100 mS per segment)
Figure 11
Note: "Halt" means that the utilization report cannot be larger than the real network utilization result.
Inter-FastMPR Interface
The FastMPR implements the inter-FastMPR interface for large scale repeater applications. Up to 6
FastMPRs can be put in to one repeater unit using the inter-FastMPR interface integrator. An extra
integrator is needed to handle hub cascading. The inter-FastMPR interface is composed of
IDAT<3:0>,
ICRS
,
IBEN
,
ICOL
, IJAM, IERR, and IDCLK.
The inter-FastMPR interface adopts asynchronous operation, a frequency-phase-independent
technique. Regardless of whether a single or multiple oscillator frequency source is used, the
FastMPR cascades or stacks easily and each FastMPR connected to the inter-FastMPR interface
integrator works well.
IDCLK is used to synchronize the data IDAT<3:0> transferred between FastMPRs. IERR is used to
indicate that the repeated data contain errors. IERR also propagates this error message to other
FastMPRs.
ICRS
is used to output the FastMPR carrier to the integrator.
When the FastMPR receives
IBEN
after
ICRS
is asserted, the FastMPR that asserted
ICRS
will put
the transmitted data into IDAT<3:0> and propagates it to the inter-FastMPR interface integrator. If the
FastMPR does not issue an
ICRS
assertion but receives
IBEN
from the integrator, the FastMPR is
ready to receive data from the integrator. If the integrator receives more than one
ICRS
asserted
from different FastMPRs, it will pull
ICOL
low so that all the FastMPRs connected to the integrator
can detect that a collision event has occurred. At this time, the FastMPR that asserted
ICRS
will
append IJAM to the inter-FastMPR interface integrator.
Extension Port Functions
The Fast Ethernet class 2 architecture has a limit of 205 meters. This means that the maximum
length allowed between two 100BaseTX repeaters is only 5 meters. The W89C880F implements an
extension port to overcome this limitation while maintaining a setup similar to 10Base-T Ethernet. The
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