參數(shù)資料
型號(hào): MC8641TVU1250HC
廠商: Freescale Semiconductor
文件頁(yè)數(shù): 47/130頁(yè)
文件大?。?/td> 0K
描述: MPU E600 SGL CORE 994-FCCBGA
標(biāo)準(zhǔn)包裝: 1
系列: MPC86xx
處理器類(lèi)型: 32-位 MPC86xx PowerPC
速度: 1.25GHz
電壓: 1.05V
安裝類(lèi)型: 表面貼裝
封裝/外殼: 994-BCBGA,F(xiàn)CCBGA
供應(yīng)商設(shè)備封裝: 994-FCCBGA(33x33)
包裝: 托盤(pán)
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MPC8641 and MPC8641D Integrated Host Processor Hardware Specifications, Rev. 2
Freescale Semiconductor
23
DDR and DDR2 SDRAM
6.2
DDR SDRAM AC Electrical Characteristics
This section provides the AC electrical characteristics for the DDR SDRAM interface.
6.2.1
DDR SDRAM Input AC Timing Specifications
Table 18 provides the input AC timing specifications for the DDR2 SDRAM when Dn_GVDD(typ)=1.8 V.
Table 19 provides the input AC timing specifications for the DDR SDRAM when Dn_GVDD(typ)=2.5 V.
Table 20 provides the input AC timing specifications for the DDR SDRAM interface.
Table 18. DDR2 SDRAM Input AC Timing Specifications for 1.8-V Interface
At recommended operating conditions
Parameter
Symbol
Min
Max
Unit
Notes
AC input low voltage
400, 533 MHz
600 MHz
VIL
—D
n_MVREF – 0.25
D
n_MVREF – 0.20
V—
AC input high voltage
400, 533 MHz
600 MHz
VIH
D
n_MVREF + 0.25
D
n_MVREF + 0.20
V—
Table 19. DDR SDRAM Input AC Timing Specifications for 2.5-V Interface
At recommended operating conditions.
Parameter
Symbol
Min
Max
Unit
Notes
AC input low voltage
VIL
—D
n_MVREF – 0.31
V
AC input high voltage
VIH
D
n_MVREF + 0.31
V
Table 20. DDR SDRAM Input AC Timing Specifications
At recommended operating conditions.
Parameter
Symbol
Min
Max
Unit
Notes
Controller Skew for
MDQS—MDQ/MECC
tCISKEW
—ps
1, 2
600 MHz
–240
240
3
533 MHz
–300
300
3
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 DDR1 frequency is 400 MHz.
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