參數(shù)資料
型號： MSC8156SVT1000B
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 數(shù)字信號處理
英文描述： 0-BIT, OTHER DSP, PBGA783
封裝： 29 X 29 MM, LEAD FREE, PLASTIC, FCBGA-783
文件頁數(shù)： 30/68頁
文件大小： 910K
代理商： MSC8156SVT1000B
MSC8156 Six-Core Digital Signal Processor Data Sheet, Rev. 3
Electrical Characteristics
Freescale Semiconductor
36
This section describes the AC timing characteristics for the MSC8156.
2.6.1
DDR SDRAM AC Timing Specifications
This section describes the AC electrical characteristics for the DDR SDRAM interface.
2.6.1.1
DDR SDRAM Input AC Timing Specifications
Table 18 provides the input AC timing specifications for the DDR SDRAM when VDDDDR (typ) = 1.8 V.
Table 19 provides the input AC timing specifications for the DDR SDRAM when VDDDDR (typ) = 1.5 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
Parameter
Symbol
Min
Max
Unit
AC input low voltage
VIL
—MVREF – 0.20
V
AC input high voltage
VIH
MVREF + 0.20
—
V
Note:
At recommended operating conditions with VDDDDR of 1.8 ± 5%.
Table 19. DDR3 SDRAM Input AC Timing Specifications for 1.5 V Interface
Parameter
Symbol
Min
Max
Unit
AC input low voltage
VIL
—MVREF – 0.175
V
AC input high voltage
VIH
MVREF + 0.175
—
V
Note:
At recommended operating conditions with VDDDDR of 1.5 ± 5%.
Table 20. DDR SDRAM Input AC Timing Specifications
Parameter
Symbol
Min
Max
Unit
Notes
Controller Skew for MDQS—MDQ/MECC/MDM
800 MHz data rate
667 MHz data rate
tCISKEW
–200
–240
200
240
ps
1, 2
Tolerated Skew for MDQS—MDQ/MECC/MDM
800 MHz data rate
667 MHz data rate
tDISKEW
–425
–510
425
510
ps
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]. Subtract this value from the total timing budget.
2.
At recommended operating conditions with VDDDDR (1.8 V or 1.5 V) ± 5%
3.
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.
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