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MPC8544EBVTALG 数据表(PDF) 22 Page - Freescale Semiconductor, Inc |
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MPC8544EBVTALG 数据表(HTML) 22 Page - Freescale Semiconductor, Inc |
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22 / 120 page  MPC8544E PowerQUICC™ III Integrated Processor Hardware Specifications, Rev. 3 22 Freescale Semiconductor DDR and DDR2 SDRAM Figure 4 shows the DDR SDRAM output timing for the MCK to MDQS skew measurement (tDDKHMH). Figure 4. Timing Diagram for tDDKHMH Figure 5 shows the DDR SDRAM output timing diagram. Figure 5. DDR and DDR2 SDRAM Output Timing Diagram Figure 6 provides the AC test load for the DDR bus. Figure 6. DDR AC Test Load MDQS MCK[n] MCK[n] tMCK MDQS tDDKHMH(max) = 0.6 ns tDDKHMH(min) = –0.6 ns ADDR/CMD tDDKHAS, tDDKHCS tDDKLDS tDDKHDS MDQ[x] MDQS[n] MCK MCK tMCK tDDKLDX tDDKHDX D1 D0 tDDKHAX, tDDKHCX Write A0 NOOP tDDKHME tDDKHMP tDDKHMH Output Z0 = 50 Ω GVDD/2 RL = 50 Ω |
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