MPC8308VMAFDA datasheet(11/88 Pages) FREESCALE

11 / 88 page

MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0

Freescale Semiconductor

DDR2 SDRAM

Table 15 provides the current draw characteristics for MVREF.

6.2

DDR2 SDRAM AC Electrical Characteristics

This section provides the AC electrical characteristics for the DDR2 SDRAM interface.

6.2.1

DDR2 SDRAM Input AC Timing Specifications

Table 16 provides the input AC timing specifications for the DDR2 SDRAM when GVDD(typ)=1.8V.

Table 17 provides the input AC timing specifications for the DDR2 SDRAM interface.

Table 15. Current Draw Characteristics for MVREF

Parameter / Condition

Symbol

Min

Max

Unit

Note

Current draw for MVREF

IMVREF

—

500

μA1

Note:

1. The voltage regulator for MVREF must be able to supply up to 500 μA current.

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

At recommended operating conditions with GVDD of 1.8 ± 100 mV

Parameter

Symbol

Min

Max

Unit

Notes

AC input low voltage

VIL

—MVREF – 0.45

—

AC input high voltage

VIH

MVREF + 0.45

—

Table 17. DDR2 SDRAM Input AC Timing Specifications

At recommended operating conditions. with GVDD of 1.8± 100 mV

Parameter

Symbol

Min

Max

Unit

Notes

Controller skew for MDQS—MDQ/MECC

266 MHz

tCISKEW

–875

875

1, 2,3

Notes:

1. tCISKEW represents the total amount of skew consumed by the controller between MDQS[n] and any corresponding bit that is

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 or MECC 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. Memory controller ODT value of 150

Ω is recommended

MPC8308VMAFDA 데이터시트(PDF) 11 Page - Freescale Semiconductor, Inc

MPC8308VMAFDA 데이터시트(HTML) 11 Page - Freescale Semiconductor, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88

데이터시트 다운로드

링크 URL