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PM7380-PI 参数 Datasheet PDF下载

PM7380-PI图片预览
型号: PM7380-PI
PDF下载: 下载PDF文件 查看货源
内容描述: 帧引擎和数据链路管理32P672 [FRAME ENGINE AND DATA LINK MANAGER 32P672]
分类和应用:
文件页数/大小: 332 页 / 2479 K
品牌: PMC [ PMC-SIERRA, INC ]
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RELEASED  
PM7380 FREEDM-32P672  
DATA SHEET  
PMC-1990262  
ISSUE 5  
FRAME ENGINE AND DATA LINK MANAGER 32P672  
11  
PCI CONFIGURATION REGISTER DESCRIPTION  
PCI configuration registers are implemented by the PCI Interface. These  
registers can only be accessed when the PCI Interface is a target and a  
configuration cycle is in progress as indicated using the IDSEL input.  
Notes on PCI Configuration Register Bits:  
1. Writing values into unused register bits has no effect. However, to ensure  
software compatibility with future, feature-enhanced versions of the product,  
unused register bits must be written with logic zero. Reading back unused  
bits can produce either a logic one or a logic zero; hence unused register bits  
should be masked off by software when read.  
2. Except where noted, all configuration bits that can be written into can also be  
read back. This allows the processor controlling the FREEDM-32P672 to  
determine the programming state of the block.  
3. Writable PCI configuration register bits are cleared to logic zero upon reset  
unless otherwise noted.  
4. Writing into read-only PCI configuration register bit locations does not affect  
FREEDM-32P672 operation unless otherwise noted.  
5. Certain register bits are reserved. These bits are associated with megacell  
functions that are unused in this application. To ensure that the FREEDM-  
32P672 operates as intended, reserved register bits must only be written with  
their default values. Similarly, writing to reserved registers should be  
avoided.  
11.1 PCI Configuration Registers  
PCI configuration registers can only be accessed by the PCI host. For each  
register description below, the hexadecimal register number indicates the PCI  
offset.  
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA,INC., AND FOR ITS CUSTOMERS’ INTERNAL USE  
252  
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