MPC8535E datasheet(33/126 Pages) FREESCALE

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DDR2 and DDR3 SDRAM

MPC8535E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 3

Freescale Semiconductor

Figure 8 shows the DDR2 and DDR3 SDRAM interface input timing diagram.

Figure 8. DDR SDRAM Input Timing Diagram

Table 17. DDR3 SDRAM Input AC Timing Specifications for 1.5-V Interface

At recommended operating conditions with GVDD of 1.5 V ± 5%. DDR3 data rate is between 606MHz and 667MHz.

Parameter

Symbol

Min

Max

Unit

Notes

AC input low voltage

VIL

—MVREF – 0.175

—

AC input high voltage

VIH

MVREF + 0.175

—

Table 18. DDR2 and DDR3 SDRAM Interface Input AC Timing Specifications

At recommended operating conditions with GVDD of 1.8 V ± 5% for DDR2 or 1.5 V ± 5% for DDR3.

Parameter

Symbol

Min

Max

Unit

Notes

Controller Skew for MDQS—MDQ/MECC

tCISKEW

—

1, 2

667 MHz

—

–240

240

—

533 MHz

—

–300

300

—

400 MHz

—

–365

365

—

Note:

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.

3. Maximum DDR2 and DDR3 frequency is 667MHz.

MCK[n]

tMCK

MDQ[x]

MDQS[n]

tDISKEW

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