mcimx27- Freescale Semiconductor, Inc, mcimx27- Datasheet - Page 79

• Manufacturer Part Number: mcimx27-
• Description: Multimedia Applications Processor
• Manufacturer: Freescale Semiconductor, Inc

3.6.9.1
Table 43
Freescale Semiconductor
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)
General
All Inputs
All Outputs
Power Supply
SDCLK
SDCLK
SD11
SD10
SD12
Figure 42. Mobile DDR SDRAM DQ versus DQS and SDCLK Read Cycle Timing Diagram
lists the SDHC electrical DC characteristics.
ID
SDHC Electrical DC Characteristics
SDRAM CLK and DQS related parameters are being 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—that is,
are driven by the ESDCTL at the negative edge of SDCLK and the
parameters are measured at maximum memory frequency.
Peak Voltage on All Lines
Input Leakage Current
Output Leakage Current
Table 42. Mobile DDR SDRAM Read Cycle Timing Parameters
Parameter
SD23
Table 43. SDHC Electrical DC Characteristics
Table 42
Preliminary—Subject to Change Without Notice
i.MX27 and i.MX27L Data Sheet, Rev. 1.2
SD21
Data
Parameter
indicates SDRAM requirements. All output signals
SD22
Data
–0.3
Min
–10
–10
NOTE
Data
V
DD
Max
10
10
+ 0.3
Data
Unit
μA
μA
V
Data
Data
Comments
tDQSCK
Symbol
tDQSQ
tQH
Data
Signal Descriptions
Min Max Unit
2.3
—
—
Data
0.85
6.7
—
ns
ns
ns
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