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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  
During clock 2, the target indicates that it wishes to disconnect by asserting  
STOPB. Data may be transferred depending on the state of the ready lines.  
During clock 3, the initiator negates FRAMEB to signal the end of the cycle.  
During clock 4, the target negates STOPB and DEVSELB in response to the  
FRAMEB signal being negated.  
Figure 35 – PCI Target Disconnect  
1
2
3
4
5
6
PCICLK  
T
FRAMEB  
STOPB  
DEVSELB  
The PCI Target Abort Diagram (Figure 36) illustrates the case when the target  
wants to abort the current cycle. Note, when the FREEDM-32P672 is the target,  
it never aborts the current cycle. A target abort is an indication of a serious error  
and no data is transferred.  
A target can terminate the current cycle by asserting STOPB and negating  
DEVSELB. If the FREEDM-32P672 is the initiator and the target aborts the  
current access, the abort condition is reported to the PCI Host.  
During clock 1, a cycle is in progress.  
During clock 2, the target negates DEVSELB and TRDYB and asserts STOPB to  
indicate an abort condition to the initiator.  
During clock 3, the initiator negates FRAMEB in response to the abort request.  
During clock 4, the target negates STOPB signal in response to the FRAMEB  
signal being negated.  
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA,INC., AND FOR ITS CUSTOMERS’ INTERNAL USE  
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