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CN8474AEPF 参数 Datasheet PDF下载

CN8474AEPF图片预览
型号: CN8474AEPF
PDF下载: 下载PDF文件 查看货源
内容描述: 多通道同步通信控制器( MUSYCC ™ ) [Multichannel Synchronous Communications Controller (MUSYCC?)]
分类和应用: 通信控制器
文件页数/大小: 221 页 / 2104 K
品牌: CONEXANT [ CONEXANT SYSTEMS, INC ]
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6.0 Basic Operation  
CN8478/CN8474A/CN8472A/CN8471A  
6.3 Channel Operation  
Multichannel Synchronous Communications Controller (MUSYCC™)  
6.3 Channel Operation  
To start any channel processing, a series of shared memory segments must be  
obtained by the host and initialized as specific descriptors which MUSYCC can  
use to control its channel processing operations.  
To illustrate the required MUSYCC configuration, assume the following:  
Port 0 is physically wired to a PCM carrying E1 signal (2.048 Mbps).  
EBUS is not used.  
PCI configuration is displayed in Table 5-3, MUSYCC PCI Function  
Memory Allocation.  
Memory Protection is enabled for range 0x00100000 to 0x001FFFFF.  
Application:  
– Port 0 is configured for 32 channel operation, E1 signal, 2.048 Mbps.  
– Transmit and Receive time slots are mapped identically.  
– Time slot 0 is mapped to logical channel 0 (64 kbps).  
– Time slot 1 bits 0–3 are mapped to logical channel 1 (32 kbps  
subchannel).  
– Time slot 2–3 are mapped to logical channel 2 (128 kbps  
hyperchannel).  
– 16-bit FCS HDLC.  
– Maximum message length is 1024 octets for channel 0.  
– Maximum message length is 512 octets for channel 1.  
– Maximum message length check is disabled for channel 2.  
– No SS7 functions.  
– Idle Code = 7Eh.  
– Pad Fill Count = 0.  
C-Language support.  
Each section below builds on the previous sections.  
6.3.1 Group Structure  
A group structure (one per supported group) must be allocated in shared memory.  
A data structure is instrumental in keeping the memory spaces for the various  
descriptors required for a channel group configuration in a sequential order and at  
exact offsets from the beginning of the group structure.  
Once a group structure is allocated in shared memory, all descriptor spaces are  
allocated within the group structure.  
Service request handling within MUSYCC requires the group structure and  
descriptor contents be at an exact offsets within the structure.  
6-8  
Conexant  
100660E