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参数资料
型号： MPC8314VRAGDA
厂商： FREESCALE SEMICONDUCTOR INC
元件分类： 微控制器/微处理器
英文描述： MICROPROCESSOR, PBGA620
封装： 29 X 29 MM, LEAD FREE, PLASTIC, TEPBGA-620
文件页数： 18/106页
文件大小： 1253K
代理商： MPC8314VRAGDA
MPC8314E PowerQUICC II Pro Processor Hardware Specifications, Rev. 0
Freescale Semiconductor
19
DDR and DDR2 SDRAM
Table 18 and Table 19 lists the input AC timing specifications for the DDR SDRAM interface.
Figure 5 shows the DDR SDRAM input AC timing for the tolerated MDQS to MDQ skew (tDISKEW)
Figure 5. Timing Diagram for tDISKEW
Table 18. DDR2 SDRAM Input AC Timing Specifications
At recommended operating conditions with GVDD of (1.8 V± 100 mV)
Parameter
Symbol
Min
Max
Unit
Notes
Controller Skew for MDQS—MDQ
266 MHz
200 MHz
tCISKEW
–875
–1250
875
1250
ps
1, 2, 3
Note:
1. tCISKEW represents the total amount of skew consumed by the controller between MDQS[n] and any corresponding bit to 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. Memory controller ODT value of 150
Ω is recommended.
Table 19. DDR SDRAM Input AC Timing Specifications
At recommended operating conditions with GVDD of (2.5V ± 200 mV)
Parameter
Symbol
Min
Max
Unit
Notes
Controller Skew for MDQS—MDQ
266 MHz
200 MHz
tCISKEW
–750
–1250
750
1250
ps
1, 2
Note:
1. tCISKEW represents the total amount of skew consumed by the controller between MDQS[n] and any corresponding bit to 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.
MCK[n]
tMCK
MDQ[x]
MDQS[n]
tDISKEW
D1
D0
tDISKEW
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