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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 8 Management Register Set  
8.6.5 Technology Ability Field (bits 4.9:5)  
When its Auto-Negotiation sublayer is enabled, the ICS1893AF transmits its link capabilities to its remote  
link partner during the auto-negotiation process. The Technology Ability Field (TAF) bits 4.12:5 determine  
the specific abilities that the ICS1893AF advertises. The ISO/IEC specification defines the TAF  
technologies in Annex 28B.  
The ISO/IEC specification reserves bits 4.12:10 for future use. When each of these reserved bits is:  
Read by an STA, the ICS1893AF returns a logic zero  
Written to by an STA, the STA must use the default value specified in this data sheet  
ICS uses some reserved bits to invoke auxiliary functions. To ensure proper operation of the ICS1893AF,  
an STA must maintain the default value of these bits. Therefore, ICS recommends that an STA always write  
the default value of any reserved bits during all management register write operations.  
Reserved bits 4.12:10 are Command Override Write (CW) bits. Whenever bit 16.15 (the Command  
Register Override bit) is logic:  
Zero, the ICS1893AF isolates all STA writes to CW bits, including bits 4.12:10.  
One, an STA can modify the value of bits 4.12:10  
Each of the bits 4.9:5 in the TAF represent a specific technology capability. When one of these bits is logic:  
Zero, it indicates to the remote link partner that the local device cannot support the technology  
represented by the bit.  
One, it indicates to the remote link partner that the local device can support the technology.  
With the exception of bit 4.9, the default settings of the TAF bits depend on the ICS1893AF operating  
mode. Bit 4.9 is always logic zero, indicating that the ICS1893AF cannot support 100Base-T4 operations.  
The TAF bits are Command Override Write bits. The default value of these bits depends on the signal level  
on the HW/SW pin and whether the Auto-Negotiation sublayer is enabled.  
With the Auto-Negotiation Enable bit (bit 0.12) set to logic:  
Zero (that is, disabled), the ICS1893AF does not execute the auto-negotiation process. Upon completion  
of the initialization sequence, the ICS1893AF proceeds to the Idle state and begins transmitting IDLES.  
Two Control Register bits – the Data Rate Select bit (bit 0.13) and the Duplex Select bit (bit 0.8) –  
determine the technology mode that the ICS1893AF uses for data transmission and reception. In this  
mode, the values of the TAF bits (bits 4.8:5) are undefined.  
One (that is, enabled), the ICS1893AF executes the auto-negotiation process and advertises its  
capabilities to the remote link partner. The TAF bits (bits 4.8:5) determine the capabilities that the  
ICS1893AF advertises to its remote link partner. For the ICS1893AF, all of these bits 4.8:5 are set to  
logic one, indicating the ability of the ICS1893AF to provide these technologies.  
Note:  
1. The ICS1893AF does not alter the value of the Status Register bits based on the TAF bits in  
register 4, as the ISO/IEC definitions for the Status Register bits require these bits to indicate all the  
capabilities of the ICS1893AF.  
2. The STA can alter the default TAF bit settings, 4.12:5, and subsequently issue an Auto-Negotiation  
Restart.  
ICS1893AF
Copyright © 2004, Integrated Circuit Systems, Inc.  
All rights reserved.  
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