MCF52274 FREESCALE [Freescale Semiconductor, Inc], MCF52274 Datasheet - Page 25

• Manufacturer Part Number: MCF52274
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

5.7.2.2
When using the SDRAM controller in DDR mode, the following timing numbers must be followed to properly latch or drive
data onto the memory bus. All timing numbers are relative to the two DQS byte lanes.
Freescale Semiconductor
SD_BA[1:0]
SD_SDR_DQS
SD_DQS[3:2]
SD_RAS
SD_CAS
SD_CSn
SD_CLK
SD_WE
SD_BA[1:0]
A[23:0]
D[31:0]
SDDM
SD_RAS,
SD_CAS,
SD_CSn,
Memories
SD_CLK
SD_CLK
SD_WE
Delayed
A[23:0],
D[31:0]
SDDM
from
DDR SDRAM AC Timing Specifications
(Measured at Output Pin)
(Measured at Input Pin)
NOTE: Data driven from memories relative
SD4
SD4
to delayed memory clock.
ROW
CMD
MCF5227x ColdFire
ROW
CMD
SD1
Preliminary—Subject to Change Without Notice
SD1
SD5
SD5
Figure 12. SDR Write Timing
Figure 13. SDR Read Timing
WD1
COL
®
COL
Microprocessor Data Sheet, Rev. 6
SD11
3/4 MCLK
Reference
SD12
Board Delay
WD2
Board Delay
SD10
WD3
SD2
WD1
SD2
SD6
tDQS
WD4
SD9
WD2
SD7
Electrical Characteristics
SD8
WD3
SD3
SD3
WD4
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