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參數(shù)資料
型號: MPC8314EVRAGDA
廠商: Freescale Semiconductor
文件頁數(shù): 13/101頁
文件大?。?/td> 0K
描述: MPU POWERQUICC II PRO 620-PBGA
標(biāo)準(zhǔn)包裝: 36
系列: MPC83xx
處理器類型: 32-位 MPC83xx PowerQUICC II Pro
速度: 400MHz
電壓: 1V
安裝類型: 表面貼裝
封裝/外殼: 620-BBGA 裸露焊盤
供應(yīng)商設(shè)備封裝: 620-PBGA(29x29)
包裝: 托盤
MPC8314E PowerQUICC II Pro Processor Hardware Specifications, Rev. 2
Freescale Semiconductor
19
DDR and DDR2 SDRAM
This figure shows the DDR SDRAM input AC timing for the tolerated MDQS to MDQ skew (tDISKEW)
Figure 5. Timing Diagram for tDISKEW
7.2.2
DDR and DDR2 SDRAM Output AC Timing Specifications
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.
Table 20. DDR and DDR2 SDRAM Output AC Timing Specifications
At recommended operating conditions
Parameter
Symbol 1
Min
Max
Unit
Note
MCK[n] cycle time at MCK[n]/MCK[n] crossing
tMCK
7.5
10
ns
2
ADDR/CMD output setup with respect to MCK
266 MHz
200 MHz
tDDKHAS
2.9
3.5
ns
3
ADDR/CMD output hold with respect to MCK
266 MHz
200 MHz
tDDKHAX
3.15
4.20
ns
3
MCS[n] output setup with respect to MCK
266 MHz
200 MHz
tDDKHCS
3.15
4.20
ns
3
Table 19. DDR SDRAM Input AC Timing Specifications
At recommended operating conditions with GVDD of (2.5V ± 200 mV)
MCK[n]
tMCK
MDQ[x]
MDQS[n]
tDISKEW
D1
D0
tDISKEW
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