參數(shù)資料
型號： MPC8379E-MDS-PB
廠商： Freescale Semiconductor
文件頁數(shù)： 29/117頁
文件大?。?/td> 0K
描述： BOARD PROCESSOR FOR MDS S
標準包裝： 1
系列： PowerQUICC II™ PRO
類型： MPU
適用于相關(guān)產(chǎn)品： MPC8379
所含物品： 板
MPC8379E PowerQUICC II Pro Processor Hardware Specifications, Rev. 8
Freescale Semiconductor
19
This table provides the input AC timing specifications for the DDR1 and DDR2 SDRAM interface.
6.2.2
DDR1 and DDR2 SDRAM Output AC Timing Specifications
This table shows the DDR1 and DDR2 SDRAM output AC timing specifications.
Table 20. DDR1 and DDR2 SDRAM Input AC Timing Specifications
Parameter
Symbol
Min
Max
Unit
Note
Controller skew for MDQS-MDQ/MECC/MDM
400 MHz data rate
333 MHz data rate
266 MHz data rate
tCISKEW
–500
–750
500
750
ps
—
Note:
1. tCISKEW represents the total amount of skew consumed by the controller between MDQSn 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 – |tCISKEW|] where T is the MCK clock period and |tCISKEW| is the
absolute value of tCISKEW.
3. This specification applies only to DDR2 interface.
Table 21. DDR1 and DDR2 SDRAM Output AC Timing Specifications
Parameter
Symbol1
Min
Max
Unit
Note
MCK
n cycle time, MCKn/MCKn crossing
tMCK
510
ns
ADDR/CMD output setup with respect to MCK
400 MHz data rate
333 MHz data rate
266 MHz data rate
200 MHz data rate
tDDKHAS
1.95
2.40
3.15
4.20
—
ns
ADDR/CMD output hold with respect to MCK
400 MHz data rate
333 MHz data rate
266 MHz data rate
200 MHz data rate
tDDKHAX
1.95
2.40
3.15
4.20
—
ns
MCS
n output setup with respect to MCK
400 MHz data rate
333 MHz data rate
266 MHz data rate
200 MHz data rate
tDDKHCS
1.95
2.40
3.15
4.20
—
ns
MCS
n output hold with respect to MCK
400 MHz data rate
333 MHz data rate
266 MHz data rate
200 MHz data rate
tDDKHCX
1.95
2.40
3.15
4.20
—
ns
MCK to MDQS skew
tDDKHMH
–0.6
0.6
ns
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