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PM7384-BI 参数 Datasheet PDF下载

PM7384-BI图片预览
型号: PM7384-BI
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84P672 [FRAME ENGINE AND DATA LINK MANAGER 84P672]
分类和应用:
文件页数/大小: 358 页 / 2808 K
品牌: PMC [ PMC-SIERRA, INC ]
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PM7384 FREEDM-84P672  
DATA SHEET  
PMC-1990445  
ISSUE 5  
FRAME ENGINE AND DATA LINK MANAGER 84P672  
During Clock 2, the initiator ceases to drive the AD[31:0] bus in order that the  
target can drive it in the next cycle. The initiator also drives the C/BEB[3:0] lines  
with the byte enables for the read data. IRDYB is driven active by the initiator to  
indicate it is ready to accept the data transfer. All subsequent cycles on the PCI  
bus are called data phases.  
During Clock 3, the target claims the transaction by driving DEVSELB active. It  
also places the first data word onto the AD[31:0] bus and drives TRDYB to  
indicate to the initiator that the data is valid.  
During Clock 4, the initiator latches in the first data word. The target negates  
TRDYB to indicate to the initiator that it is not ready to transfer another data  
word.  
During Clock 5, the target places the second data word onto the AD[31:0] bus  
and drives TRDYB to indicate to the initiator that the data is valid.  
During Clock 6, the initiator latches the second data word and negates IRDYB to  
indicate to the target that it is not ready for the next transfer. The target shall  
drive the third data word until the initiator accepts it.  
During Clock 7, the initiator asserts IRDYB to indicate to the target it is ready for  
the third data word. It also negates FRAMEB since this shall be the last transfer.  
During Clock 8, the initiator latches in the last word and negates IRDYB. The  
target, having seen FRAMEB negated in the last clock cycle, negates TRDYB  
and DEVSELB. All of the above signals shall be driven to their inactive state in  
this clock cycle, except for FRAMEB which shall be tristated. The target shall  
stop driving the AD[31:0] bus and the initiator shall stop driving the C/BEB[3:0]  
bus; this shall be the turnaround cycle for these signals.  
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE  
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