2
1
3
4
4
DDRREFCLK(N|P)
5
TMS320C6474
SPRS552F – OCTOBER 2008 – REVISED JULY 2010
www.ti.com
7.10.3 DDR2 Memory Controller Electrical Data/Timing
The TMS320C6474 DDR2 Implementation Guidelines application report (literature number
SPRAAW8
)
specifies a complete DDR2 interface solution for the C6474 device as well as a list of compatible DDR2
devices. TI has performed the simulation and system characterization to ensure all DDR2 interface timings
in this solution are met.
TI only supports designs that follow the board design guidelines outlined in the
SPRAAW8
application report.
Table 7-38. Timing Requirements for DDRREFCLK(N|P)
(1)
(see
Figure 7-23
)
NO.
PARAMETERS
MIN
MAX
UNIT
1
t
c(DDRREFCLK)
Cycle time, DDRREFCLK(N|P)
15
25
ns
2
t
w(DDRREFCLKH)
Pulse duration, DDRREFCLK(N|P) high
0.4C
ns
3
t
w(DDRREFCLKL)
Pulse duration, DDRREFCLK(N|P) low
0.4C
ns
4
t
t(DDRREFCLK)
Transition time, DDRREFCLK(N|P)
50
1300
ps
5
t
j(DDRREFCLK)
Period jitter (peak-to-peak), DDRREFCLK(N|P)
0.02 x
ps
t
c(DDRREFCLK)
(1)
C=1/DDRREFCLK(N|P)
Figure 7-23. DDRREFCLK(N|P) Timing
134
Peripheral Information and Electrical Specifications
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