AM3359, AM3358, AM3357
AM3356, AM3354, AM3352
SPRS717F –OCTOBER 2011–REVISED APRIL 2013
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5.6.2.3.4.1 Two DDR3 Devices
Two DDR3 devices are supported on the DDR3 interface consisting of two x8 DDR3 devices arranged as
one 16-bit bank. 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.
5.6.2.3.4.1.1 CK and ADDR_CTRL Topologies, Two DDR3 Devices
Figure 5-52 shows the topology of the CK net classes and Figure 5-53 shows the topology for the
corresponding ADDR_CTRL net classes.
DDR3 Differential CK Input Buffers
–
–
+
+
Clock Parallel
Terminator
VDDS_DDR
Rcp
A1
A1
A2
A2
A3
A3
AT
AT
Cac
AM335x
Differential Clock
Output Buffer
+
–
0.1 µF
Rcp
Routed as Differential Pair
Figure 5-52. CK Topology for Two DDR3 Devices
DDR3 Address and Control Input Buffers
Address and Control
Terminator
Rtt
AM335x
Address and Control
Output Buffer
A1
A2
A3
AT
Vtt
Figure 5-53. ADDR_CTRL Topology for Two DDR3 Devices
5.6.2.3.4.1.2 CK and ADDR_CTRL Routing, Two DDR3 Devices
Figure 5-54 shows the CK routing for two DDR3 devices placed on the same side of the PCB. Figure 5-55
shows the corresponding ADDR_CTRL routing.
180
Peripheral Information and Timings
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