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參數(shù)資料
| 型號(hào)： | E-1110 |
| 英文描述： | E-1110 10/100/1000 Mbits/s Ethernet MAC preliminary technical manual 4/01 |
| 中文描述： | 電子1110 10/100/1000 Mbits /秒以太網(wǎng)MAC初步的技術(shù)手冊(cè)4 / 01 |
| 文件頁(yè)數(shù)： | 85/108頁(yè) |
| 文件大?。?/td> | 577K |
| 代理商： | E-1110 |
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3-40
Signals
MII_CRS
MII Carrier Sense
Output
The E-1110 asserts the MII_CRS signal asynchronously
with minimum propagation delay from the detection of a
nonidle medium. The E-1110 deasserts MII_CRS when it
detects an idle medium. The E-1110 also asserts
MII_CRS with minimum propagation delay in response to
MII_TXEN.
The E-1110 ensures that MCRS remains asserted
throughout the duration of a collision condition.
MII_COL
MII Collision Detected
Output
The E-1110 asserts the MII_COL signal asynchronously
with minimum delay from the start of a collision on the
media. The PHY deasserts MII_ MCOL to indicate no
collision. MII_MCOL is internally synchronized to the
MII_TCLK clock and in the worst case may take up to two
clock cycles to be detected by the E-110 MAC transmit
function.
MII_TCLK
MII Transmit Clock.
Output
The MII_TCLK signal operates at a frequency of 25 or
2.5 MHz. MII_TCLK is a continuous clock that provides a
timing reference for transfer of the MII_TXEN,
MII_TXD[3:0], and MII_TXER signals from the E-110
MAC to the E-1110. The E-1110 provides MII_TCLK.
The MII_TCLK frequency is 25% of the transmit data
rate. When the E-1110 operates at 100 Mbits/s, it
provides an MII_TCLK frequency of 25 MHz
± 100 ppm.
When the E-1110 operates at 10 Mbits/s, it provides a
MII_TCLK frequency of 2.5 MHz
± 100 ppm. The duty
cycle of the MII_TCLK signal is between 35% and 60%,
inclusively.
MII_TCLK is also driven during test scan mode from
E1110_MII_TX_CLK.
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