MCIMX25 Motorola Semiconductor Products, MCIMX25 Datasheet - Page 63

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

1
Freescale Semiconductor
These values are for a DQ/DM slew rate of 1 V/ns and a DQS slew rate of 1 V/ns. For additional values use
DtDH1 Derating Values for DDR2-400, DDR2-533.”
DDR17
DDR18
DDR19
DDR20
DDR21
DDR22
DDR23
ID
DQ & DQM setup time to DQS (single-ended strobe)
DQ & DQM hold time to DQS (single-ended strobe)
Write cycle DQS falling edge to SDCLK output setup time
Write cycle DQS falling edge to SDCLK output hold time
DQS latching rising transitions to associated clock edges
DQS high-level width
DQS low-level width
DQM (output)
DQS (output)
DQ (output)
SDCLK_B
SDCLK
2.0 V/ns
S1
Table 49. tDS1, tDH1 Derating Values for DDR2-400, DDR2-533
tD
i.MX25 Applications Processor for Consumer and Industrial Products, Rev. 2
H1
tD
Figure 32. DDR2 SDRAM Write Cycle Timing Diagram
Table 48. DDR2 SDRAM Write Cycle Parameter Table
1.5 V/ns
S1
tD
DDR17
DDR21
DDR17
H1
tD
Parameter
S1
1.0 V/ns
tD
Data
DM
H1
tD
DDR18
DDR18
Data
DM
0.9 V/ns
S1
tD
DQS Single-Ended Slew Rate
H1
DDR17
tD
DDR17
Data
DM
1
1
DDR22
0.8 V/ns
S1
tD
Data
DM
H1
tD
DDR23
0.7 V/ns
S1
DDR18
DDR18
tD
t
t
Symbol
Data
DS1(base)
DH1(base)
DM
t
t
t
t
t
DQSS
DQSH
DQSL
DSS
DSH
H1
tD
0.6 V/ns
S1
Data
DM
tD
DDR19
0.025
0.025
H1
-0.25
Min.
0.35
0.35
tD
0.2
0.2
1,2,3
DDR2-400
Data
DM
S1
0.5 Vns
tD
Table
Max.
0.25
H1
Data
DM
—
—
—
—
—
—
tD
DDR20
49, “DtDS1,
0.4 V/ns
S1
tD
Unit
tCK
tCK
tCK
tCK
tCK
ns
ns
H1
tD
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