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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  
FREEDM-32P672 is the initiator and aborts the transaction, it reports the error  
condition to the PCI Host.  
Figure 38 – PCI Initiator Abort Termination  
1
2
3
4
5
6
7
PCICLK  
T
FRAMEB  
T
T
T
TRDYB  
IRDYB  
DEVSELB  
The PCI Exclusive Lock Cycle Diagram (Figure 39) illustrates the case when the  
current initiator locks the PCI bus. The FREEDM-32P672 will never initiate an  
lock, but will behave appropriately when acting as a target.  
During clock 1, the present initiator has gained access of the LOCKB signal and  
the PCI bus. The first cycle of a locked access must be a read cycle. The  
initiator asserts FRAMEB and drives the address of the target on the AD[31:0]  
lines.  
During clock 2, the present initiator asserts LOCKB to indicate to the target that a  
locked cycle is in progress.  
During clock 3, the target samples the asserted LOCKB signal and marks itself  
locked. The data cycle has to complete in order for the lock to be maintained. If  
for some reason the cycle was aborted, the initiator must negate LOCKB.  
During clock 4, the data transfer completes and the target is locked.  
During clock 6, another initiator may use the PCI bus but it cannot use the  
LOCKB signal. If the other initiator attempts to access the locked target that it  
did not lock, the target would reject the access.  
During clock 7, the same initiator that locked this target accesses the target. The  
initiator asserts FRAMEB and negates LOCKB to re-establish the lock.  
During clock 8, the target samples LOCKB deasserted and locks itself.  
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA,INC., AND FOR ITS CUSTOMERS’ INTERNAL USE  
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