参数资料
型号: MC8640DHX1250HC
厂商: Freescale Semiconductor
文件页数: 45/130页
文件大小: 0K
描述: MPU DUAL E600 1023-FCCBGA
标准包装: 1
系列: MPC86xx
处理器类型: 32-位 MPC86xx PowerPC
速度: 1.25GHz
电压: 1.05V
安装类型: 表面贴装
封装/外壳: 1023-BCBGA,FCCBGA
供应商设备封装: 1023-FCCBGA(33x33)
包装: 散装
MPC8640 and MPC8640D Integrated Host Processor Hardware Specifications, Rev. 3
Freescale Semiconductor
21
DDR and DDR2 SDRAM
6.2
DDR SDRAM AC Electrical Characteristics
This section provides the AC electrical characteristics for the DDR SDRAM interface.
6.2.1
DDR SDRAM Input AC Timing Specifications
Table 18 provides the input AC timing specifications for the DDR2 SDRAM when Dn_GVDD(typ) =1.8 V.
Table 19 provides the input AC timing specifications for the DDR SDRAM when Dn_GVDD(typ) =2.5 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
At recommended operating conditions (see Table 2)
Parameter
Symbol
Min
Max
Unit
Notes
AC input low voltage
VIL
—D
n_MVREF – 0.25
V
AC input high voltage
VIH
D
n_MVREF + 0.25
V
Table 19. DDR SDRAM Input AC Timing Specifications for 2.5-V Interface
At recommended operating conditions (see Table 2)
Parameter
Symbol
Min
Max
Unit
Notes
AC input low voltage
VIL
—D
n_MVREF – 0.31
V
AC input high voltage
VIH
D
n_MVREF + 0.31
V
Table 20. DDR SDRAM Input AC Timing Specifications
At recommended operating conditions (see Table 2)
Parameter
Symbol
Min
Max
Unit
Notes
Controller Skew for
MDQS—MDQ/MECC
tCISKEW
ps
1, 2
533 MHz
–300
300
3
400 MHz
–365
365
Note:
1. tCISKEW represents the total amount of skew consumed by the controller between MDQS[n] 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 – abs(tCISKEW)) where T is the clock period and abs(tCISKEW) is the
absolute value of tCISKEW.
3. Maximum DDR1 frequency is 400 MHz.
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