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| 型號(hào)： | E-110 |
| 廠(chǎng)商： | LSI Corporation |
| 英文描述： | 100BASE-T Fast Ethernet Core(100BASE-T快速以太網(wǎng)處理芯片 Fast Ethernet Core) |
| 中文描述： | 100兆- T的快速以太網(wǎng)核心（100兆- T的快速以太網(wǎng)處理芯片快速以太網(wǎng)核心） |
| 文件頁(yè)數(shù)： | 22/130頁(yè) |
| 文件大?。?/td> | 770K |
| 代理商： | E-110 |
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1-14
Introduction
1.4.1.1 System Data Flow
The E-110 MAC operates at either 10 or 100 Mbit/s between an MII on
one side and a host on the other. The receive and transmit data streams
are independent from each other on both sides of the MAC.
The receive byte stream from the E-110 MAC operates on the MII
receive clock. Another element of the overall system may assemble bytes
from the receive byte stream into words for storage in a buffer memory
or transmission to a system bus. Alternatively, the receive byte stream
might enter directly into a FIFO. The output of the FIFO could then be
interfaced into the overall system in a variety of ways, possibly using a
common system clock.
The transmit byte stream for the E-110 MAC operates on the MII transmit
clock. Another element of the overall system may disassemble words
read from a buffer memory or received from a system bus into bytes for
the transmit byte stream. Alternatively, the transmit byte stream might exit
directly from a FIFO. The input of the FIFO could then be fed from the
overall system in a variety of ways, possibly using a common system
clock.
Logic associated with the transmit and receive byte streams handles the
packet and data flow control between the overall system and the E-110
MAC. Specifically, a device external to the E-110 MAC must monitor the
receive byte stream to perform receive address recognition.
Details of the receive byte stream interface can be found in Section
3.2.1.2, “MAC Receive Function,” on page 3-13. An explanation of the
transmit byte stream interface can be found in Section 3.2.1.1, “MAC
Transmit Function,” on page 3-5. E-110 MAC behavior can be altered
with external control signals. A description of the control signals is given
in Chapter 2.
1.4.1.2 Statistics Vectors Interface
The E-110 MAC collects packet-by-packet statistics, but does not include
statistics event counters or accumulating byte counters. Statistics for
management purposes are collected outside the E-110 MAC for either
end station or multiple channel applications.
Figure 1.8 shows how a centralized statistics collector for use with
multiple E-110 MACs might be constructed.
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