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XR-T7234 PDF预览

XR-T7234

更新时间： 2024-11-07 20:06:11
品牌 Logo 应用领域
艾科嘉 - EXAR ATM异步传输模式电信电信集成电路
页数 文件大小 规格书
318页 2905K
描述
Support Circuit, 1-Func

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中文翻译

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XR-T7234 技术参数

是否无铅： 含铅是否Rohs认证： 不符合
生命周期：Obsolete包装说明：,
Reach Compliance Code：compliantHTS代码：8542.39.00.01
风险等级：5.9应用程序：ATM
JESD-609代码：e0功能数量：1
峰值回流温度（摄氏度）：NOT SPECIFIED认证状态：Not Qualified
标称供电电压：5 V电信集成电路类型：ATM/SONET/SDH SUPPORT CIRCUIT
端子面层：Tin/Lead (Sn/Pb)处于峰值回流温度下的最长时间：NOT SPECIFIED
Base Number Matches：1

XR-T7234 数据手册

 浏览型号XR-T7234的Datasheet PDF文件第2页浏览型号XR-T7234的Datasheet PDF文件第3页浏览型号XR-T7234的Datasheet PDF文件第4页浏览型号XR-T7234的Datasheet PDF文件第5页浏览型号XR-T7234的Datasheet PDF文件第6页浏览型号XR-T7234的Datasheet PDF文件第7页 
x r  
PRELIMINARY  
XRT7234  
E3 UNI FOR ATM  
NOVEMBER ‘999  
REV. P1.0.0  
(ATMLayer Processor)  
1.0 SYSTEM DESCRIPTION  
Whenever an ATM switch needs to transmit and receive  
ATM cells to and from the UNI, it will typically use some  
sort of “ATM Layer” processing entity to accomplish this  
processing of cell data. This “ATM Switch Processing”  
entity will be referred as the “ATM Layer Processor”  
throughout this data sheet. The ATM Layer processor  
interfaces with the XR- T7234 E3 UNI via the “Utopia  
Bus” and will write in ATM cell data (in an 8- bit or 16- bit  
wide parallel format) into the Transmit Utopia Interface  
block (of the UNI). Additionally, the ATM Layer processor  
will also receive ATM cells (in this same 8- bit or 16- bit  
wide parallel format) from the Receive Utopia Interface  
block (within the UNI IC).  
The XR- T7234 E3 UNI IC for ATM consists of the following  
functional sections/ blocks.  
• Transmit Section  
– Transmit Utopia Interface Block  
– Transmit Cell Processor Block  
– Transmit E3 Framer Block  
• Receive Section  
– Receive Utopia Interface Block  
– Receive Cell Processor Block  
– Receive E3 Framer Block  
Interfacing to the Local Microprocessor  
• Microprocessor Interface Section  
• Performance Monitor Section  
• Test and Diagnostic Section  
In contrast to the ATM Layer Processor, the “local”  
microprocessor (m P) interfaces with the UNI via the Micro-  
processor Interface. This local “housekeeping” micropro-  
cessor will typically read and write “configuration  
information” from or into the on- chip registers within the  
UNI IC. Further, the local microprocessor will respond to  
UNI- generated interrupts, read and write PMDL (Path  
Maintenance Data Link) Messages and OAM cell data  
into and from the UNI IC. Finally, the local microprocessor  
will “monitor” the performance of the overall system by peri-  
odically reading the contents of the “Performance Monitor”  
registers.  
• Line Interface Drive and Scan Section  
Each of these functional sections (and the blocks, within  
these sections) combine to make a single chip device  
that is capable of transmitting and receiving ATM cell  
data via a E3 Transport Medium.  
1.1 SYSTEM LEVEL INTERFACING  
OF THE XR- T7234 E3 UNI  
Note: The local m should not be confused with the ATM  
Layer processor. The terms “local m P” and “ATM Layer  
Processor” will be used throughout this data sheet in  
order to make the distinction between these two “enti-  
ties”.  
1.2  
• The system designer, when using the XR- T7234 E3  
UNI IC for ATM, must (at a minimum) interface this  
chip to the following entities.  
Interfacing the UNI to the E3 Line  
• The ATM Switch (or ATM Layer Processor)  
• A local (housekeeping) microprocessor  
• The E3 line  
The UNI can be interfaced to a E3 line that is operating  
over a copper or optical medium. If the user intends to  
interface the UNI to a copper E3 line, (e.g., over coaxial  
cable), then he/ she must connect the dual rail inputs  
(RxPOS and RxNEG) and the dual rail outputs (TxPOS  
and TxNEG) to a E3 Line Interface Unit (LIU) IC, (which is  
transformer- coupled to the E3 line) in order to reliably  
transmit and receive this data over the copper medium.  
An example of such an LIU are the XR- T7295E (E3 Line  
Figures 1 and 2 presents two illustrations of the UNI being  
interfaced to these three entities. A brief discussion on  
how to interface the UNI to these entities follows.  
Interfacing to the ATM Switch  
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 u (510) 668- 7000 u (510) 668- 7010  
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