參數(shù)資料
型號(hào): E-110
廠商: 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): 29/130頁(yè)
文件大小: 770K
代理商: E-110
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E-110 MAC Core
1-21
Figure 1.11 MII Function
As new MII PHYs become available, they can be attached to the E-110
MAC, providing increased capability at both 10 Mbit/s and 100 Mbit/s.
You can continue to interface to the PHYs by means of the E-110 MAC’s
built-in MII function.
1.4.5 MAC Backoff Operation
When a data collision occurs, the MAC must perform a backoff operation,
which causes the MAC to wait for a time and then try retransmitting. The
MAC implements two selectable backoff methods:
Stop Backoff
Truncate Backoff
1.4.5.1 Stop Backoff
The Stop Backoff feature is implemented with the TBOFF_SEL input pin.
The TBOFF_SEL input, driven by the host, controls whether the E-110
core uses the Binary Exponential Backoff algorithm during collisions. See
Chapter 2, “Signal Descriptions,” for a detailed signal description.
Transmit
Function
External
PHY
(MII or PMD)
MII
Signals
Receive
Function
MII
Signals
MAC
E-110 Core
8
8
4 bits/25 MHz
1
or
4 bits/2.5 MHz
2
4 bits/25 MHz
1
or
4 bits/2.5 MHz
2
Notes:
1. 4 bits/25 MHz means that the data path is 4 bits wide (a nibble) and that
the clock rate is 25 MHz, which yields 100 Mbit/s
2. 4 bits/2.5 MHz means that the data path is 4 bits wide (a nibble) and that the clock
rate is 2.5 MHz, which yields 10 Mbit/s
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