欢迎访问ic37.com |
会员登录 免费注册
发布采购

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 ]
 浏览型号1893CF的Datasheet PDF文件第45页浏览型号1893CF的Datasheet PDF文件第46页浏览型号1893CF的Datasheet PDF文件第47页浏览型号1893CF的Datasheet PDF文件第48页浏览型号1893CF的Datasheet PDF文件第50页浏览型号1893CF的Datasheet PDF文件第51页浏览型号1893CF的Datasheet PDF文件第52页浏览型号1893CF的Datasheet PDF文件第53页  
ICS1893AF Data Sheet - Release  
Note:  
Chapter 7 Functional Blocks  
1. An ICS1893AF receives ‘valid data’ when its Twisted-Pair Receiver phase-locked loop can acquire lock  
and extract the receive clock from the incoming data stream for a minimum of three consecutive bit  
times.  
2. When a link is invalid and the Link Monitor Function detects the presence of data, the ICS1893AF does  
not transition the link to the valid state until after the reception of the present packet is complete.  
3. Enabling or disabling the Smart Squelch Function affects the Link Monitor function.  
4. A transition from the invalid state to the valid state does not automatically update the latching-low Link  
Status bit.  
7.5.6 10Base-T Operation: Smart Squelch  
The Smart Squelch Function imposes more stringent requirements on the Link Monitor Function regarding  
the definition of a valid link, thereby providing a level of insurance that spurious noise is not mistaken for a  
valid link during cable installation.  
An STA can control the execution of the ICS1893AF Smart Squelch Function using bit 18.0 (the Smart  
Squelch Inhibit bit in the 10Base-T Operations Register). When bit 18.0 is logic:  
Zero (the default), an ICS1893AF enables its Smart Squelch Function. In this case, the Link Monitor  
must confirm the presence of both data and a valid IDL at the end of the packet before declaring a link  
valid.  
One, an ICS1893AF disables or inhibits its Smart Squelch Function. In this case, the Link Monitor does  
not have to confirm the presence of an IDL to declare a link valid (that is, the reception of any data is  
sufficient).  
In 10Base-T mode, an ICS1893AF appends an IDL to the end of each packet during data transmission.  
The receiving PHY (that is, the remote link partner) sees this IDL and removes it from the data stream.  
7.5.7 10Base-T Operation: Carrier Detection  
The ICS1893AF has a 10Base-T Carrier Detection Function that establishes the state of its Carrier Sense  
signal (CRS), based upon the state of its Transmit and Receive state machines. These functions indicate  
whether the ICS1893AF is (1) transmitting data, (2) receiving data, or (3) in a collision state (that is, the  
ICS1893AF is both transmitting and receiving data on its twisted-pair medium, as defined in the ISO/IEC  
8802-3 standard). When the ICS1893AF is configured for:  
Half-duplex operations, the ICS1893AF asserts its CRS signal when either transmitting or receiving data.  
Full-duplex operations (or when it is in Repeater mode), the ICS1893AF asserts its CRS signal only  
when it is receiving data.  
7.5.8 10Base-T Operation: Collision Detection  
The ICS1893AF has a 10Base-T Collision Detection Function that establishes the state of its Collision  
Detection signal (COL) based upon both (1) the state of its Receiver state machine and (2) the state of its  
Transmit state machine. When the ICS1893AF is operating in:  
Half-duplex mode, the ICS1893AF asserts its COL signal to indicate it is receiving data while  
transmission of data is also in progress.  
Full-duplex mode, the ICS1893AF always sets its COL signal to FALSE.  
ICS1893AF,
Copyright © 2004, Integrated Circuit Systems, Inc.  
All rights reserved.  
49  
 复制成功!