參數(shù)資料
型號: MSC8144EVT1000A
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 數(shù)字信號處理
英文描述: 133 MHz, OTHER DSP, PBGA783
封裝: 29 X 29 MM, LEAD FREE, PLASTIC, FCPBGA-783
文件頁數(shù): 33/80頁
文件大?。?/td> 1251K
代理商: MSC8144EVT1000A
Electrical Characteristics
MSC8144E Quad Core Digital Signal Processor Data Sheet, Rev. 14
Freescale Semiconductor
39
2.6.4
DDR SDRAM AC Timing Specifications
This section describes the AC electrical characteristics for the DDR SDRAM interface.
2.6.4.1
DDR SDRAM Input Timings
Table 20 provides the input AC timing specifications for the DDR SDRAM when VDDDDR (typ) = 2.5 V.
Table 21 provides the input AC timing specifications for the DDR SDRAM when VDDDDR (typ) = 1.8 V.
Table 22 provides the input AC timing specifications for the DDR SDRAM interface.
Table 20. DDR SDRAM Input AC Timing Specifications for 2.5-V Interface
Parameter
Symbol
Min
Max
Unit
AC input low voltage
VIL
—MVREF – 0.31
V
AC input high voltage
VIH
MVREF + 0.31
V
Note:
At recommended operating conditions with VDDDDR of 2.5 ± 5%.
Table 21. DDR2 SDRAM Input AC Timing Specifications for 1.8-V Interface
Parameter
Symbol
Min
Max
Unit
AC input low voltage
VIL
—MVREF – 0.25
V
AC input high voltage
VIH
MVREF + 0.25
V
Note:
At recommended operating conditions with VDDDDR of 1.8 ± 5%.
Table 22. DDR SDRAM Input AC Timing Specifications
Parameter
Symbol
Min
Max
Unit
Controller Skew for MDQS—MDQ/MECC/MDM1
400 MHz
333 MHz
266 MHz
200 MHz
tCISKEW
–365
–390
–428
–490
365
390
428
490
ps
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]. Subtract this value from the total timing budget.
2.
At recommended operating conditions with VDDDDR (1.8 V or 2.5 V) ± 5%
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