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MPC8548CVUAQH Datasheet(PDF) 21 Page - Freescale Semiconductor, Inc |
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MPC8548CVUAQH Datasheet(HTML) 21 Page - Freescale Semiconductor, Inc |
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21 / 144 page  MPC8548E PowerQUICC™ III Integrated Processor Hardware Specifications, Rev. 6 Freescale Semiconductor 21 DDR and DDR2 SDRAM 6.2 DDR SDRAM AC Electrical Characteristics This section provides the AC electrical characteristics for the DDR SDRAM interface. The DDR controller supports both DDR1 and DDR2 memories. DDR1 is supported with the following AC timings at data rates of 333 MHz. DDR2 is supported with the following AC timings at data rates down to 333 MHz. 6.2.1 DDR SDRAM Input AC Timing Specifications Table 16 provides the input AC timing specifications for the DDR SDRAM when GVDD(typ) = 1.8 V. Table 17 provides the input AC timing specifications for the DDR SDRAM when GVDD(typ) = 2.5 V. Table 18 provides the input AC timing specifications for the DDR SDRAM interface. Table 16. DDR2 SDRAM Input AC Timing Specifications for 1.8-V Interface At recommended operating conditions Parameter Symbol Min Max Unit AC input low voltage VIL —MVREF – 0.25 V AC input high voltage VIH MVREF + 0.25 — V Table 17. DDR SDRAM Input AC Timing Specifications for 2.5-V Interface At recommended operating conditions. Parameter Symbol Min Max Unit AC input low voltage VIL —MVREF – 0.31 V AC input high voltage VIH MVREF + 0.31 — V Table 18. DDR SDRAM Input AC Timing Specifications At recommended operating conditions. Parameter Symbol Min Max Unit Notes Controller Skew for MDQS—MDQ/MECC 533 MHz 400 MHz 333 MHz tCISKEW –300 –365 –390 300 365 390 ps 1, 2 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 following equation: tDISKEW = ± (T/4 – abs(tCISKEW)) where T is the clock period and abs(tCISKEW) is the absolute value of tCISKEW. |
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