MCIMX35 Motorola Semiconductor Products, MCIMX35 Datasheet - Page 48

• Manufacturer Part Number: MCIMX35
• Manufacturer: Motorola Semiconductor Products

48
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
MCIMX35 (i.MX35) Multimedia Applications Processor for Automotive Products Advance Information, Rev. 0
DQS (input)
DQ (input)
SDCLK
SDCLK
Figure 24. Mobile DDR SDRAM DQ versus DQS and SDCLK Read Cycle Timing Diagram
SDRAM CLK and DQS-related parameters are measured from the 50%
point—that is, “high” is defined as 50% of signal value, and “low” is
defined as 50% of signal value.
The timing parameters are similar to the ones used in SDRAM data sheets.
Table 37
the ESDCTL at the negative edge of SDCLK, and the parameters are
measured at maximum memory frequency.
Table 37. Mobile DDR SDRAM Read Cycle Timing Parameters
indicates SDRAM requirements. All output signals are driven by
SD23
Preliminary—Subject to Change Without Notice
SD21
Data
Parameter
SD22
Data
NOTE
Data
Data
Data
Data
tDQSCK
Symbol
tDQSQ
tQH
Freescale Semiconductor
Data
Min. Max. Unit
2.3
—
—
Data
0.85
6.7
—
ns
ns
ns