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參數(shù)資料
| 型號： | 8502 |
| 廠商： | LSI Corporation |
| 英文描述： | Ethernet MII(Media Independent Interface) to AUI(Attachment Unit Interface) Interface Adapter(以太網(wǎng)獨立于媒體接口與附屬單元接口適配器) |
| 中文描述： | 以太網(wǎng)MII（媒體獨立接口）的投資者聯(lián)盟（連接單元接口）接口適配器（以太網(wǎng)獨立于媒體接口與附屬單元接口適配器） |
| 文件頁數(shù)： | 9/55頁 |
| 文件大?。?/td> | 457K |
| 代理商： | 8502 |
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8502
4-9
9
MD400157/D
RXD[3:0] on falling edges of the RX_CLK clock. The
RXD[3:0] data has he same packet ormat as he TXD[3:0]
data and is specified in IEEE 802.3 specifications as
shown in Figure 2. When the end of packet is detected,
CRS and RX_DV are deasserted. CRS and RX_DV also
stay deasserted if the Link Detect bit in the MI serial port
bit is set to the Link Fail state.
The collision output, COL, is asserted whenever the colli-
sion condition is detected.
3.2.2 MII Disable
The MII inputs and outputs can be disabled by setting the
MII disable bit in the MI serial port Control register. When
the MII is disabled, the MII inputs are ignored, the MII
outputs are high impedance, and the AUI transmitter is
idle. If the MI address lines, MDA[1:0], are pulled high
during reset or powerup, the 8502 powers up and resets
with the MII disabled. Otherwise, the 8501/8502 powers
up and resets with the MII enabled.
3.3 MANCHESTER ENCODER
The Manchester encoder converts the NRZ nibble data
from the MII into a single Manchester encoded serial data
stream and adds a start of dle (SOI) pulse at the end of the
packet as specified in the IEEE 802.3 specifications. The
Manchester encoding process combines clock and data
such that the first half of the data bit contains the comple-
ment of the data, and the second half of the data bit
contains the true data, as described in IEEE 802.3 speci-
fications. This guarantees that a transition always occurs
in the middle of the data bit cell. Manchester encoding of
the data from TXD occurs only when TX_EN is asserted.
3.4 MANCHESTER DECODER
The Manchester decoder converts the serial data stream
from the AUI receiver into NRZ data for the MII. Thus, the
Manchester decoder performs clock and data recovery
from the Manchester encoded serial data stream. In
Manchester encoded data, the first half of the data bit
contains the complement of the data, and the second half
of the data bit contains the true data.
Clock recovery is done with a PLL. When valid data is not
detected on the AUI input, an internal 10 MHz clock is
applied o he nput of he PLL. When valid data s detected
on the AUI nput, the PLL nput s switched to the ncoming
AUI data. The PLL then recovers the clock by ocking onto
zero crossings of the preamble of the ncoming signal from
the AUI cable. The recovered clock frequency is 10 MHz.
The PLL can ock onto the preamble signal n ess than 12
transitions (bit times) and can reliably perform the data
recovery process with up to
±
18 nS of jitter on the AUI
input. While the PLL is in the process of locking onto the
preamble signal, some of the preamble data symbols are
lost. The clock recovery process recovers enough pre-
amble data symbols to pass at least 6 nibbles to the
receive MII Media Independent Interface as shown in
Figure 2.
Data recovery is performed by latching in data from the
receiver with the recovered clock extracted by the PLL.
The data is also converted from a single bit stream into
nibble data according the format shown in Figure 2.
3.5 AUI TRANSMITTER
3.5.1 Transmitter
The AUI (Attachement Unit Interface) transmitter takes
the Manchester encoded data, shapes t to meet the pulse
template outlined in IEEE 802.3 and shown in Figure 3,
adjusts the output voltage to meet the IEEE 802.3 required
levels for AUI, and drives the 78 Ohm AUI cable.
Figure 3. AUI Transmit Output Voltage Template
V
mV
1
V
mV
2
V
mV
3
mV
0
t
t
t
t
BT or BT/2
16 ns
V dm
8 ns
t = 2.5 ns
V < 1315 mV. V > 450 mV
V = 0.89 V
V = 0.82 V
1
2
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