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1893CF 参数 Datasheet PDF下载

1893CF图片预览
型号: 1893CF
PDF下载: 下载PDF文件 查看货源
内容描述: [Interface Circuit, 1-Trnsvr, CMOS, PDSO48, 0.300 MM INCH, SSOP-48]
分类和应用: 网络接口电信集成电路电信电路光电二极管
文件页数/大小: 136 页 / 1040 K
品牌: IDT [ INTEGRATED DEVICE TECHNOLOGY ]
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ICS1893AF Data Sheet - Release  
Chapter 7 Functional Blocks  
7.5.11 10Base-T Operation: Twisted-Pair Transmitter  
The 10Base-T Twisted-Pair Transmitter is functionally similar to the 100Base-TX Twisted-Pair Transmitter.  
The primary differences are in the data rate and signaling, as specified in the ISO/IEC specifications. For  
more information, see Section 7.4.5, “100Base-TX Operation: Twisted-Pair Transmitter”.  
7.5.12 10Base-T Operation: Twisted-Pair Receiver  
The 10Base-T Twisted-Pair Receiver is functionally similar the 100Base-TX Twisted-Pair Receiver. The  
primary differences are in the data rate and signaling, as specified in the ISO/IEC specifications. For more  
information, see Section 7.4.6, “100Base-TX Operation: Twisted-Pair Receiver”.  
7.5.13 10Base-T Operation: Auto Polarity Correction  
The ICS1893AF can sense and then automatically correct a signal polarity that is reversed on its  
Twisted-Pair Receiver inputs. A signal polarity reversal occurs when the input signals on an ICS1893AF’s  
TP_RXP and TP_RXN pins are crossed or swapped (a problem that can occur during network installation  
or wiring).  
The ICS1893AF accomplishes reversed signal polarity detection and correction by examining the signal  
polarity of the Normal Link Pulses (NLPs). In 10Base-T mode, an ICS1893AF transmits and receives NLPs  
when its link is in the Idle state. In 100Base-TX mode, an ICS1893AF transmits and receives NLPs during  
Auto-Negotiation. An STA can control this feature using the 10Base-T Operations Register bit 18.3, the  
Auto Polarity-Inhibit bit. When this bit is logic:  
Zero, the ICS1893AF automatically senses and corrects a reversed or inverted signal polarity on its  
Twisted-Pair Receive pins (TP_RXP and TP_RXN).  
One, the ICS1893AF disables this feature.  
When an ICS1893AF detects a reversed signal polarity on its Twisted-Pair Receiver pins and the Auto  
Polarity-Inhibit bit is also logic zero (enabled), the ICS1893AF (1) automatically corrects the data stream  
and (2) sets its Polarity Reversed bit (bit 18.14) to logic one, to indicate to the STA that this situation exists.  
Bit 18.14 is a latching high (LH) 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”.)  
Note: The Auto Polarity Correction Function is primarily a 10Base-T operation. However, it is part of the  
Twisted-Pair Receiver and is operational during the 100Base-TX auto-negotiation process.  
7.5.14 10Base-T Operation: Isolation Transformer  
The 10Base-T Isolation Transformer operates the same as the 100Base-TX Isolation Transformer. In fact,  
in a typical ICS1893AF application they are the same unit. For more information, see Section 7.4.8,  
“100Base-TX Operation: Isolation Transformer”.  
ICS1893AF,
Copyright © 2004, Integrated Circuit Systems, Inc.  
All rights reserved.  
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