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PM7348 参数 Datasheet PDF下载

PM7348图片预览
型号: PM7348
PDF下载: 下载PDF文件 查看货源
内容描述: [ATM/SONET/SDH IC, CMOS, PBGA324,]
分类和应用: ATM异步传输模式
文件页数/大小: 318 页 / 1736 K
品牌: PMC [ PMC-SIERRA, INC ]
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S/UNI-IMA-4 Telecom Standard Product Data Sheet  
Released  
Figure 7 8-bit Transmit Cell Transfer Format  
Bits 7-0  
Address Prepend  
Byte 0  
(Any-PHY  
only)  
Optional Prepend[15:8]  
Optional Prepend[7:0]  
Byte 1  
(Optional)  
Byte 2  
(Optional)  
H1  
Byte 3  
Byte 4  
Byte 5  
Byte 6  
Byte 7*  
H2  
H3  
H4  
HEC  
PAYLOAD1  
Byte 8  
S
S
S
PAYLOAD48  
Byte 55  
10.1.2 Receive Any-PHY/UTOPIA Slave (RXAPS)  
In the receive direction, each S/UNI-IMA-4 transmits cells on an Any-PHY/UTOPIA L2  
compatible interface operating at clock rates up to 52 MHz and supporting 16-bit and 8-bit wide  
cells. The S/UNI-IMA-4 operates as a bus slave.  
In all modes, an optional prepend is allowed on the bus. This prepend will always be set to zero  
and has no significance to the S/UNI-IMA-4 but is provided for interoperability.  
UTOPIA Level 2 Multi-Address Slave Mode  
In UTOPIA Level 2 Multi-Address Slave mode, the S/UNI-IMA-4 operates as a 4 port multi-  
PHY with each virtual PHY stored in its own FIFO. A 4-bit configuration register, RCAEN,  
controls the response to polling the individual channels within this group of 4 ports. Setting  
RCAEN[0] enables any group of four ports within the addresses 0 through 7, and RCAEN[3]  
enables any group of four ports within the addresses 24 through 30. This is typically used to  
allow more than one slave device to share the Receive UTOPIA master bus. When polled, the  
Receive Packet Available (RPA) output indicates whether there is at least one cell available for  
transfer from the polled link. Upon selection, the interface handles data pausing anywhere in the  
middle of a cell transfer.  
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.  
Document No.: PMC-2020889, Issue 2  
47