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PEB2086N 参数 Datasheet PDF下载

PEB2086N图片预览
型号: PEB2086N
PDF下载: 下载PDF文件 查看货源
内容描述: ISDN SubscribernAccess控制器 [ISDN SubscribernAccess Controller]
分类和应用: 数字传输接口电信集成电路电信电路综合业务数字网控制器
文件页数/大小: 320 页 / 1450 K
品牌: INFINEON [ Infineon ]
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Functional Description  
2.3.8  
Command/Indicate (C/I) Channel Handling  
The C/I channel conveys the commands and indications between the layer-1 and layer-2 parts  
of the ISAC-S. This channel is available in all timing modes. Beside being accessed by the  
internal layer-2 part, it can also be accessed by an external layer-2 device, e.g. to control the  
layer-1 activation/deactivation procedures. This access is arbitrated via the TIC bus access  
protocol which is performed in the MONITOR channel.  
The C/I channel is accessed via register CIRR (in receive direction, layer-1 to layer-2) and  
register CIXR (in transmit direction, layer-2 to layer-1). The C/I code is four bits long.  
A listing and explanation of the layer-1 C/I codes can be found in chapter 3.4.  
In the receive direction, the code from layer-1 is continuously monitored, with an interrupt being  
generated anytime a change occurs (ISTA:CISQ). A new code must be found in two  
consecutive IOM frames to be considered valid and to trigger a C/I code change interrupt  
status (double last look criterion).  
In the transmit direction, the code written in CIXR is continuously transmitted in the C/I  
channel.  
2.3.9  
TIC Bus Access  
The arbitration mechanism implemented in the monitor channel of the IOM allows the access  
of external communication controllers (up to 7) to the layer-1 functions provided in the ISAC-S  
and to the D channel. (TIC bus; see figure 24). To this effect the outputs of the controllers  
(ICC:ISDN Communication Controller PEB 2070) are wired-or-and connected to pin IDP1, a  
pull-up resistor being already provided in the ISAC-S. The inputs of the ICC’s are connected  
to pin IDP0.  
Semiconductor Group  
55  
 
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