參數(shù)資料
型號： MPC8240LZU250X
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 250 MHz, RISC PROCESSOR, PBGA352
封裝： TBGA-352
文件頁數(shù)： 7/52頁
文件大小： 542K
代理商： MPC8240LZU250X
MPC8240 (rev0.5) Hardware Specifications
15
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
Electrical and Thermal Characteristics
inherent in the design when the DLL is at tap point 0 and the DLL is contributing no delay; tx0 equals
approximately 3 ns. See Figure 5 for DLL locking ranges.
8
Pin to pin skew includes quantifying the additional amount of clock skew (or jitter) from the DLL besides
any intentional skew added to the clocking signals from the variable length DLL synchronization feedback
loop, i.e. the amount of variance between the internal sys_logic_clk and the SDRAM_SYNC_IN signal
after the DLL is locked. While pin to pin skew between SDRAM_CLKs can be measured, the relationship
between the internal sys_logic_clk and the external SDRAM_SYNC_IN can not be measured and is
guaranteed by design.
Figure 4 shows the PCI_SYNC_IN Input Clock Timing Diagram and Figure 5 shows the DLL Locking
Range Loop Delay vs. Frequency of Operation.
.
Figure 4. PCI_SYNC_IN Input Clock Timing Diagram
5a
5b
VM
VM = Midpoint Voltage (1.4V)
2
3
CVIL
CVIH
1
PCI_SYNC_IN
VM
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