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PM7380 参数 Datasheet PDF下载

PM7380图片预览
型号: PM7380
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  
Figure 36 – PCI Target Abort  
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2
3
4
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PCICLK  
T
FRAMEB  
TRDYB  
STOPB  
DEVSELB  
The PCI Bus Request Cycle Diagram (Figure 37) illustrates the case when the  
initiator is requesting the bus from the bus arbiter.  
When the FREEDM-32P672 is the initiator, it requests the PCI bus by asserting  
its REQB output to the central arbiter. The arbiter grants the bus to the  
FREEDM-32P672 by asserting the GNTB line. The FREEDM-32P672 will wait  
till both the FRAMEB and IRDYB lines are idle before starting its access on the  
PCI bus. The arbiter can remove the GNTB signal at any time, but the  
FREEDM-32P672 will complete the current transfer before relinquishing the bus.  
Figure 37 – PCI Bus Request Cycle  
1
2
3
4
5
6
PCICLK  
REQB  
GNTB  
T
FRAMEB  
The PCI Initiator Abort Termination Diagram (Figure 38) illustrates the case when  
the initiator aborts a transaction on the PCI bus.  
An initiator may terminate a cycle if no target claims it within five clock cycles. A  
target may not have responded because it was incapable of dealing with the  
request or a bad address was generated by the initiator. IRDYB must be valid  
one clock after FRAMEB is deasserted as in a normal cycle. When the  
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA,INC., AND FOR ITS CUSTOMERS’ INTERNAL USE  
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