參數(shù)資料
型號: MCF547X
廠商: 飛思卡爾半導體(中國)有限公司
英文描述: MCF547x Integrated Microprocessor Electrical Characteristics
中文描述: MCF547x集成的微處理器,電氣特性
文件頁數(shù): 14/28頁
文件大?。?/td> 706K
代理商: MCF547X
MCF547x Integrated Microprocessor Electrical Characteristics, Rev. 2
SDRAM Bus
Freescale Semiconductor
14
Figure 9. SDR Read Timing
9.2
DDR SDRAM AC Timing Characteristics
When using the DDR SDRAM controller, the following timing numbers must be followed to properly
latch or drive data onto the memory bus. All timing numbers are relative to the four DQS byte lanes.
Table 12
shows the DDR clock crossover specifications.
Table 12. DDR Clock Crossover Specifications
Symbol
Characteristic
Min
Max
Unit
V
MP
Clock output mid-point voltage
1.05
1.45
V
V
OUT
Clock output voltage level
–0.3
SD_VDD + 0.3
V
V
ID
Clock output differential voltage (peak to peak swing)
0.7
SD_VDD + 0.6
V
V
IX
NOTES:
1
The clock crossover voltage is only guaranteed when using the highest drive strength option for the
SDCLK[1:0] and SDCLK[1:0] signals.
Clock crossing point voltage
1
1.05
1.45
V
SDCLK0
SDCLK1
SDCSn,SDWE,
RAS, CAS
SDDM
SDDATA
SDADDR,
SDBA[1:0]
SD2
CMD
ROW
SD2
SD1
SD5
COL
WD1
WD2
WD3
WD4
SD10
3/4 MCLK
Reference
SDRQS
SDDQS
Delayed
SDCLK
SD11
SD8
Board Delay
SD9
Board Delay
SD7
tDQS
form
Memories
(Measured at Output Pin)
(Measured at Input Pin)
SD6
NOTE: Data driven from memories relative
to delayed memory clock.
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