DM385, DM388
SPRS821D –MARCH 2013–REVISED DECEMBER 2013
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DVDD_DDR[0]
Cac
Rcp
Rcp
A2
A2
A3
A3
A4
A4
A3
A3
AT
AT
0.1 µF
=
Figure 8-64. CK Routing for Four Mirrored DDR3 Devices
Rtt
A2
A3
A4
A3
AT
Vtt
=
Figure 8-65. ADDR_CTRL Routing for Four Mirrored DDR3 Devices
8.13.3.14.2 Two DDR3 Devices
Two DDR3 devices are supported on the DDR EMIF consisting of two x8 DDR3 devices arranged as one
bank (CS), 16 bits wide, or two x16 DDR3 devices arranged as one bank (CS), 32 bits wide. These two
devices may be mounted on a single side of the PCB, or may be mirrored in a pair to save board space at
a cost of increased routing complexity and parts on the backside of the PCB.
8.13.3.14.2.1 CK and ADDR_CTRL Topologies, Two DDR3 Devices
Figure 8-66 shows the topology of the CK net classes and Figure 8-67 shows the topology for the
corresponding ADDR_CTRL net classes.
240
Peripheral Information and Timings
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