MCIMX25 Motorola Semiconductor Products, MCIMX25 Datasheet - Page 60

• Manufacturer Part Number: MCIMX25
• Manufacturer: Motorola Semiconductor Products

3.6.6.1.3
The following diagrams and tables specify timing related to the SDRAMC module, which interfaces with
DDR2 SDRAM.
60
SD21 DQS – DQ Skew (defines the data valid window in read cycles related to DQS)
SD22 DQS DQ HOLD time from DQS
SD23 DQS output access time from SDCLK posedge
ID
DQS (input)
DQ (input)
SDCLK
SDCLK
Figure 30. Mobile DDR SDRAM DQ versus DQS and SDCLK Read Cycle Timing Diagram
DDR2 SDRAM–Specific Parameters
i.MX25 Applications Processor for Consumer and Industrial Products, Rev. 2
Table 45. Mobile DDR SDRAM Read Cycle Timing Parameters
SD23
SD21
Data
Parameter
SD22
Data
Data
Data
Data
Data
tDQSCK
Symbol
tDQSQ
tQH
Freescale Semiconductor
Data
Min. Max. Unit
2.3
—
—
Data
0.85
6.7
—
ns
ns
ns