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MPC8544E 数据表(PDF) 20 Page - Freescale Semiconductor, Inc |
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MPC8544E 数据表(HTML) 20 Page - Freescale Semiconductor, Inc |
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20 / 117 page  MPC8544E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 5 20 Freescale Semiconductor DDR and DDR2 SDRAM 6.2.2 DDR SDRAM Output AC Timing Specifications Table 18 provides the output AC timing specifications for the DDR SDRAM interface. Table 18. DDR SDRAM Output AC Timing Specifications At recommended operating conditions. Parameter Symbol1 Min Max Unit Notes MCK[n] cycle time, MCK[n]/MCK[n] crossing tMCK 3.75 6 ns 2 ADDR/CMD output setup with respect to MCK tDDKHAS ns 3 533 MHz 400 MHz 333 MHz 1.48 1.95 2.40 — — — 7 ADDR/CMD output hold with respect to MCK tDDKHAX ns 3 533 MHz 400 MHz 333 MHz 1.48 1.95 2.40 — — — 7 — — MCS[n] output setup with respect to MCK tDDKHCS ns 3 533 MHz 400 MHz 333 MHz 1.48 1.95 2.40 — — — 7 — — MCS[n] output hold with respect to MCK tDDKHCX ns 3 533 MHz 400 MHz 333 MHz 1.48 1.95 2.40 — — — 7 — — MCK to MDQS Skew tDDKHMH –0.6 0.6 ns 4 MDQ/MECC/MDM output setup with respect to MDQS tDDKHDS, tDDKLDS ps 5 533 MHz 400 MHz 333 MHz 538 700 900 — — — 7 — — MDQ/MECC/MDM output hold with respect to MDQS tDDKHDX, tDDKLDX ps 5 533 MHz 400 MHz 333 MHz 538 700 900 — — — 7 — — MDQS preamble tDDKHMP 0.75 x tMCK — ns 6 |
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