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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  
Figure 33 – PCI Read Cycle  
1
2
3
4
5
6
7
8
9
PCICLK  
T
FRAMEB  
T
T
T
Address  
Data 1  
Data 2  
Byte Enable  
Data 3  
AD[31:0]  
Bus Cmd  
T
C/BEB[3:0]  
Byte Enable  
Byte Enable  
IRDYB  
TRDYB  
T
T
DEVSELB  
A PCI burst write transaction is shown in Figure 34. The cycle is valid for target  
and initiator accesses. The target is responsible for incrementing the address for  
the duration of the data burst. The 'T' symbol stands for a turn around cycle. A  
turn around cycle is required on all signals which can be driven by more than one  
agent.  
During clock 1, the initiator drives FRAMEB to indicate the start of a cycle. It also  
drives the address onto the AD[31:0] bus and drives the C/BEB[3:0] lines with  
the write command (in the above example the command would indicate a burst  
write). The IRDYB, TRDYB and DEVSELB signals are in turnaround mode (no  
agent is driving the signals for this clock cycle). This cycle on the PCI bus is  
called the address phase.  
During clock 2, the initiator ceases to drive the address onto the AD[31:0] bus  
and starts driving the first data word. The initiator also drives the C/BEB[3:0]  
lines with the byte enables for the write data. IRDYB is driven active by the  
initiator to indicate it is ready to accept the data transfer. The target claims the  
transaction by driving DEVSELB active and drives TRDYB to indicate to the  
initiator that it is ready to accept the data. All subsequent cycles on the PCI bus  
are called data phases.  
During clock 3, the target latches in the first data word. The initiator starts to  
drive the next data word onto the AD[31:0] lines.  
During clock 4, the target latches in the second data word. Both the initiator and  
the target indicate that they are not ready to transfer any more data by negating  
the ready lines.  
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA,INC., AND FOR ITS CUSTOMERS’ INTERNAL USE  
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