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MPC8347ECVVAGDB 参数 Datasheet PDF下载

MPC8347ECVVAGDB图片预览
型号: MPC8347ECVVAGDB
PDF下载: 下载PDF文件 查看货源
内容描述: MPC8347EA的PowerQUICC II Pro整合型主机处理器的硬件规格 [MPC8347EA PowerQUICC II Pro Integrated Host Processor Hardware Specifications]
分类和应用: 外围集成电路PC时钟
文件页数/大小: 99 页 / 727 K
品牌: FREESCALE [ Freescale ]
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DDR and DDR2 SDRAM  
Table 19 provides the input AC timing specifications for the DDR SDRAM interface.  
Table 19. DDR and DDR2 SDRAM Input AC Timing Specifications  
At recommended operating conditions with GVDD of (1.8 or 2.5 V) 5%.  
Parameter  
Symbol  
Min  
Max  
Unit  
Notes  
Controller Skew for MDQS—MDQ/MECC/MDM  
tCISKEW  
ps  
1, 2  
3
400 MHz  
–600  
–750  
–750  
–750  
600  
750  
750  
750  
333 MHz  
266 MHz  
200 MHz  
Notes:  
1. tCISKEW represents the total amount of skew consumed by the controller between MDQS[n] and any corresponding bit that  
will be captured with MDQS[n]. This should be subtracted from the total timing budget.  
2. The amount of skew that can be tolerated from MDQS to a corresponding MDQ signal is called tDISKEW. This can be  
determined by the equation: tDISKEW  
value of tCISKEW  
=
(T/4 – abs (tCISKEW)); where T is the clock period and abs (tCISKEW) is the absolute  
.
3. This specification applies only to the DDR interface.  
Figure 5 illustrates the DDR input timing diagram showing the t  
timing parameter.  
DISKEW  
MCK[n]  
MCK[n]  
tMCK  
MDQS[n]  
MDQ[x]  
D0  
D1  
tDISKEW  
tDISKEW  
Figure 5. DDR Input Timing Diagram  
MPC8347EA PowerQUICC II Pro Integrated Host Processor Hardware Specifications, Rev. 12  
Freescale Semiconductor  
19