參數(shù)資料
型號： MC8641DVU1250JB
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： MICROPROCESSOR, CBGA1023
封裝： 33 X 33 MM, ROHS COMPLIANT, CERAMIC, BGA-1023
文件頁數(shù)： 56/140頁
文件大?。?/td> 1484K
代理商： MC8641DVU1250JB
MPC8641 and MPC8641D Integrated Host Processor Hardware Specifications, Rev. 0
22
Freescale Semiconductor
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.
Figure 4 shows the DDR SDRAM input timing for the MDQS to MDQ skew measurement (tDISKEW).
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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