MPC8535E datasheet(32/126 Pages) FREESCALE

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MPC8535E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 3

DDR2 and DDR3 SDRAM

Freescale Semiconductor

Table 14 provides the DDR capacitance when GVDD(type) = 1.8 V.

Table 15 provides the current draw characteristics for MVREF.

2.6.2

DDR2 and DDR3 SDRAM Interface AC Electrical Characteristics

This section provides the AC electrical characteristics for the DDR SDRAM Controller interface. The DDR controller supports

both DDR2 and DDR3 memories. Please note that although the minimum data rate for most off-the-shelf DDR3 DIMMs

available is 800 MHz, JEDEC specification does allow the DDR3 to run at the data rate as low as 606 MHz. Unless otherwise

specified, the AC timing specifications described in this section for DDR3 is applicable for data rate between 606 MHz and

667 MHz, as long as the DC and AC specifications of the DDR3 memory to be used are compliant to both JEDEC specifications

as well as the specifications and requirements described in this MPC8535E hardware specifications document.

2.6.2.1

DDR2 and DDR3 SDRAM Interface Input AC Timing Specifications

Table 16 through Table 18 provide the input AC timing specifications for the DDR controller.

Table 14. DDR2 SDRAM Capacitance for GVDD(typ)=1.8 V

Parameter/Condition

Symbol

Min

Max

Unit

Notes

Input/output capacitance: DQ, DQS, DQS

CIO

1, 2

Delta input/output capacitance: DQ, DQS, DQS

CDIO

—

0.5

1, 2

Note:

1. This parameter is sampled. GVDD = 1.8 V ± 0.090 V (for DDR2), f = 1 MHz, TA = 25°C, VOUT = GVDD/2, VOUT

(peak-to-peak) = 0.2 V.

2. This parameter is sampled. GVDD = 1.5 V ± 0.075 V (for DDR3), f = 1 MHz, TA = 25°C, VOUT = GVDD/2, VOUT

(peak-to-peak) = 0.175 V.

Table 15. Current Draw Characteristics for MVREF

Parameter/Condition

Symbol

Min

Max

Unit

Note

Current draw for MVREFn

DDR2 SDRAM

IMVREFn

—

1500

μA1

DDR3 SDRAM

1250

1.The voltage regulator for MVREF must be able to supply up to 1500 μA or 1250 uA current for DDR2 or DDR3 respectively.

Table 16. DDR2 SDRAM Input AC Timing Specifications for 1.8-V Interface

At recommended operating conditions with GVDD of 1.8 V ± 5%

Parameter

Symbol

Min

Max

Unit

AC input low voltage

667

VILAC

—MVREF – 0.20

<=533

—

MVREF – 0.25

AC input high voltage

667

VIHAC

MVREF + 0.20

—

<=533

MVREF + 0.25

—

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