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| 型號(hào)： | 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)： | 101/152頁 |
| 文件大小： | 943K |
| 代理商： | 1893YI-10 |
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ICS1893 Rev C 6/6/00
June, 2000
52
Chapter 7
Functional Blocks
ICS1893 Data Sheet - Release
Copyright 2000, Integrated Circuit Systems, Inc.
All rights reserved.
7.5.4
10Base-T Operation: Idle
An ICS1893 transmits Normal Link Pulses (that is, 10Base-T Idles) on its MDI in the absence of data (that is,
when the MAC/repeater is not requiring it to transmit any data). During this time the link is Idle, and the
ICS1893 periodically transmits link pulses at a rate of one link pulse every 16 ms in compliance with the
ISO/IEC 8802-3 standard. In 10Base-T mode, the ICS1893 continues transmitting link pulses even while
receiving data. This situation does not generate a Collision Detect signal (COL) because link pulses indicate
an idle state for a link.
7.5.5
10Base-T Operation: Link Monitor
When an ICS1893 is in 10Base-T mode, its Link Monitor Function observes the data received by the
10Base-T Twisted-Pair Receiver to determine the link status. The results of this continual monitoring are
stored in the Link Status bit. The Station Management entity (STA) can access the Link Status bit in either
the Status Register (bit 1.2) or the QuickPoll Detailed Status Register (bit 17.0).
When the Link Status bit is:
Zero, either a valid link is not established or the link is momentarily dropped since either the last read of
the Link Status bit or the last reset of the ICS1893.
One, a valid link is established.
The ICS1893 Link Status bit is a latching low (LL) bit. (For more information on latching high and latching
low bits, see Section 8.1.4.1, “Latching High Bits”and Section 8.1.4.2, “Latching Low Bits”.)
The criteria used by the Link Monitor Function to declare a link either valid (that is, ‘established’or ‘up’) or
invalid (that is, ‘failed’or ‘down’) depends upon these factors: the present state of the link, whether its
Smart Squelch function is enabled, and the incoming data.
When the 10Base-T link is:
Invalid, and the Smart Squelch function is:
– Disabled (bit 18.0 is logic zero), the Link Monitor Function must detect at least one of the following
events before transitioning its link from the invalid state to the valid state:
More than seven, ISO/IEC-defined, Normal Link Pulses (NLPs)
Any valid data
– Enabled (bit 18.0 is logic one), the Link Monitor Function must detect at least one of the following
events before transitioning its link from the invalid state to the valid state:
More than seven, ISO/IEC-defined, Normal Link Pulses (NLPs)
Any valid data followed by a valid IDL
Valid, and the Smart Squelch function is:
– Disabled (bit 18.0 is logic zero), the Link Monitor Function continues to report its link as valid as long
as it continues to detect any of the following:
ISO/IEC-defined, Normal Link Pulses (NLPs)
Any valid data
– Enabled (bit 18.0 is logic one), the Link Monitor Function continues to report its link as valid as long
as it continues to detect any of the following:
ISO/IEC-defined, Normal Link Pulses (NLPs)
Any valid data followed by a valid IDL
Valid, the Link Monitor Function declares the link as invalid if it receives neither data nor NLPs (that is,
the link shows either no activity or inconsistent activity) for more than 81 to 83 ms. In this case the Link
Monitor Function sets the Link Status bit to logic zero.
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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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