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| 型號： | 1893YI-10 |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 網(wǎng)絡(luò)接口 |
| 英文描述： | DATACOM, INTERFACE CIRCUIT, PQFP64 |
| 封裝： | 10 X 10 MM, TQFP-64 |
| 文件頁數(shù)： | 100/152頁 |
| 文件大小： | 943K |
| 代理商： | 1893YI-10 |
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Chapter 7
Functional Blocks
ICS1893 Rev C 6/6/00
June, 2000
51
ICS1893 - Release
Copyright 2000, Integrated Circuit Systems, Inc.
All rights reserved.
7.5
Functional Block: 10Base-T Operations
When configured for 10Base-T mode, the ICS1893 MAC/Repeater Interface can be configured to provide
either a 10M MII (Media Independent Interface) or a 10M Serial Interface. The Twisted-Pair Interface is
automatically configured to provide a two-level, Manchester-encoded signal at the voltage levels specified
in the ISO/IEC standard. (For more information on the Twisted-Pair Interface, see Section 6.5,
“Twisted-Pair Interface”.)
The 10Base-T and 100Base-TX operations differ as follows. 10Base-T operations are fundamentally
simpler than 100Base-TX operations. The data rate is slower, requiring less encoding than 100Base-TX
operations. In addition, the bandwidth requirements (and therefore the line attenuation issues) are not as
severe as with 100-MHz operations. Consequently, when an ICS1893 is set for 10Base-T operations, it
requires fewer internal circuits in contrast to 100Base-TX operations. (For an overview of 10Base-T
operations, see Section 5.6, “10Base-T Operations”.).
7.5.1
10Base-T Operation: Manchester Encoder/Decoder
During data transmission the ICS1893 acquires data from its MAC/Repeater Interface in either 4-bit nibbles
or as a serial bit stream. The ICS1893 converts this data into a Manchester-encoded signal for presentation
to its MDI, as required by the ISO/IEC specification.
In a Manchester-encoded signal, all logic:
Ones are:
– Positive during the first half of the bit period
– Negative during the second half of the bit period
Zeros are:
– Negative during the first half of the bit period
– Positive during the second half of the bit period
During 10Base-T data reception, a Manchester Decoder translates the serial bit stream obtained from the
Twisted-Pair Receiver (MDI) into an NRZ bit stream. The Manchester Decoder then passes the data to the
MAC/Repeater Interface in either serial or parallel format, depending on the interface configuration.
Manchester-encoded signals have the following advantages:
Every bit period has an encoded clock.
The split-phase nature of the signal always provides a zero DC level regardless of the data (that is, there
is no baseline wander phenomenon).
The primary disadvantage in using Manchester-encoded signals is that it doubles the data rate, making it
operationally prohibitive for 100-MHz operations.
7.5.2
10Base-T Operation: Clock Synthesis
The ICS1893 synthesizes the clocks required for synchronizing data transmission. In 10Base-T mode, the
MAC/Repeater Interface can provide either a 10M MII (Media Independent Interface) or a 10M Serial
Interface. When the ICS1893 is configured to support a:
10M MII interface, the ICS1893 synthesizes a 2.5-MHz clock for nibble-wide transactions
10M Serial Interface to the MAC/repeater, the ICS1893 synthesizes a 10-MHz clock
7.5.3
10Base-T Operation: Clock Recovery
The ICS1893 recovers its receive clock from the Manchester-encoded data stream obtained from its
Twisted-Pair Receiver using a phase-locked loop (PLL). The ICS1893 then uses this recovered clock for
synchronizing data transmission between itself and the MAC/repeater. Receive-clock PLL acquisitions begin
with reception of the MAC Frame Preamble and continue as long as the ICS1893 is receiving data.
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| 1893YI-10LF | 功能描述:以太網(wǎng) IC 3.3V 10/100 BASE TX INTEGRATED PHYCEIVER RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray |
| 1893YI-10LFT | 功能描述:以太網(wǎng) IC 3.3V 10/100 BASE TX INTEGRATED PHYCEIVER RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray |
| 1894 | 功能描述:支架與墊片 HEX .187X.625 ALUM RoHS:否 制造商:Schurter 類型:Transipillar Spacers 長度:16 m 螺紋大小:M4 外徑:10 mm 材料:Nylon with Steel 電鍍:Zinc |
| 1894# | 制造商:Fluke Electronics 功能描述:BNC (F)/BANANA PLUG 制造商:Pomona Electronics 功能描述: |
| 1894 | 制造商:Pomona Electronics 功能描述:ADAPTER BNC FEMALE-BANANA PLUG 制造商:Pomona Electronics 功能描述:ADAPTER, BNC FEMALE-BANANA PLUG |
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