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PM9315-HC 参数 Datasheet PDF下载

PM9315-HC图片预览
型号: PM9315-HC
PDF下载: 下载PDF文件 查看货源
内容描述: 增强TT1 ™交换机结构 [ENHANCED TT1⑩ SWITCH FABRIC]
分类和应用: 电信集成电路电信电路
文件页数/大小: 343 页 / 5229 K
品牌: PMC [ PMC-SIERRA, INC ]
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RELEASED  
PMC-Sierra, Inc.  
PM9311/2/3/5 ETT1™ CHIP SET  
Data Sheet  
PMC-2000164  
ISSUE 3  
ENHANCED TT1™ SWITCH FABRIC  
4.1.1 OOB Interface and Control/Status Registers  
All of the devices have an OOB interface. This interface allows a single local CPU to control and monitor all  
of the devices within a core fabric. Internally, each device provides registers that can be mapped into the  
CPU’s address space. These registers are described in more detail in Section 4.4 “Crossbar Registers”.  
4.2 MODES OF OPERATION  
The default mode of operation is for the Crossbar to act as a 32-port switch. In this mode, each ETT1 port  
has one connection to each of the Crossbars. If an 8- or 16-port switch is required, the Crossbar can be  
configured so that fewer Crossbar devices are required. In these modes, the term superport represents a  
system port.  
In 8-port mode, the Crossbar considers four of its ports to be a single superport. For example, ports 0, 1, 2,  
and 3 make up superport 0, ports 28, 29, 30, and 31 are superport 7. A single superport is connected to  
only three Crossbars. For example, superport 0 has its first 4 Dataslices connected to ports 0, 1, 2, and 3  
of Crossbar 0, its next 4 Dataslices connected to ports 0, 1, 2, and 3 of Crossbar 1, and its last 4 Dataslices  
connected to ports 0, 1, 2, and 3 of Crossbar 2.  
In 16-port mode, the Crossbar considers two of its ports to be a single superport. Ports 0 & 1 make up  
superport 0, and ports 30 & 31 make up superport 15 for example. A single superport is connected to six  
Crossbars. In this case, superport 0 has its first 2 Dataslices connected to ports 0 and 1 of Crossbar 0, and  
its last Dataslices are connected to ports 0 and 1 of Crossbar 5.  
The mode is set via the OOB bus. The Crossbar acts as if the superports make up a ‘trunk’, so that either  
two or four of the inputs are routed as a single port.  
4.3 OOB ACCESS  
The Crossbars can be written and read via the OOB bus. In addition to the device select addresses 0x7FF  
(all devices) and 0x7B (all Crossbars), each Crossbar can be addressed with an individual device select  
specified by {000100, CCCC, 000, C} where CCCCC is the Crossbar number in the range 0-31 (these  
correspond to device selects 0x200 to 0x2F1, not including all addresses within that range). The Registers  
section of this chapter illustrates the usage of the subaddress field to specify registers within the Crossbar.  
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE  
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