MCIMX25_11 Datasheet, PDF (37/140 Pages) Freescale Semiconductor, Inc – i.MX25 Applications Processor for Automotive Products

3.6.3.2 DDR_TYPE = 01 SDRAM I/O AC Parameters and Requirements
Table 27 shows AC parameters for SDRAM I/O.
Table 27. AC Parameters for SDRAM I/O
Parameter
Duty cycle
Clock frequency
Output pad transition times (max. drive)
Symbol
Fduty
f
tpr
Output pad transition times (high drive)
tpr
Output pad transition times (standard drive) tpr
Output pad propagation delay (max. drive),
tpo
50%–50%
Output pad propagation delay (high drive),
tpo
50%–50%
Output pad propagation delay (standard
tpo
drive), 50%–50%
Output pad propagation delay (max. drive),
tpo
40%–60%
Output pad propagation delay (high drive),
tpo
40%–60%
Output pad propagation delay (standard
tpo
drive), 40%–60%
Output enable to output valid delay (max.
tpv
drive), 50%–50%
Output enable to output valid delay (high
tpv
drive), 50%–50%
Output enable to output valid delay (standard tpv
drive), 50%–50%
Output enable to output valid delay (max.
tpv
drive), 40%–60%
Output enable to output valid delay (high
tpv
drive), 40%–60%
Output enable to output valid delay (standard tpv
drive), 40%–60%
Load
Condition
—
—
25 pF
50 pF
25 pF
50 pF
25 pF
50 pF
15 pF
35 pF
15 pF
35 pF
15 pF
35 pF
15 pF
35 pF
15 pF
35 pF
15 pF
35 pF
15 pF
35 pF
15 pF
35 pF
15 pF
35 pF
15 pF
35 pF
15 pF
35 pF
15 pF
35 pF
Min.
Rise/Fall
Typ.
Max.
Rise/Fall
Units
40
50
60
—
—
133
0.82/0.87 1.14/1.13 1.62/1.50
1.56/1.67 2.13/2.09 3.015/2.7
7
1.23/1.31 1.71/1.68 2.39/2.22
2.31/2.47 3.22/3.12 4.53/4.16
2.44/2.60 3.38/3.27 4.73/4.38
4.65/4.99 6.38/6.23 9.05/8.23
0.97/1.19 1.69/0.75 2.17/2.46
2.85/3.21 2.02/2.30 2.93/3.27
1.15/1.39 1.72/1.93 2.51/2.77
3.57/3.91 2.54/2.85 3.66/3.97
2.01/1.57 2.45/2.69 3.54/3.77
5.73/6.05 4.10/4.51 5.84/6.13
1.06/1.26 1.53/1.73 2.18/2.47
1.38/1.38 1.96/2.23 2.78/3.12
1.15/1.20 1.72/1.93 2.45/2.71
1.75/1.67 2.37/2.66 3.35/3.67
1.91/2.01 2.30/2.52 3.26/3.50
2.88/2.56 3.59/3.97 5.06/5.36
0.90/1.27 1.44/1.89 2.19/2.87
1.07/1.77 1.66/2.51 2.51/3.69
1.01/1.48 1.58/2.16 2.38/3.23
1.37/2.33 2.06/3.09 3.06/4.46
1.32/2.14 2.02/3.00 3.01/4.36
2.04/3.67 3.00/4.91 4.40/6.90
1.03/1.34 1.54/1.94 2.26/2.88
1.16/1.74 1.74/2.44 2.55/3.54
1.11/1.51 1.65/2.15 2.43/3.16
1.39/2.10 2.03/2.89 2.95/4.13
1.35/2.03 1.99/2.83 2.89/4.03
1.91/3.23 2.76/4.30 3.98/6.01
%
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Notes
—
1
1
1
1
1
—
i.MX25 Applications Processor for Automotive Products, Rev. 8
Freescale Semiconductor
37