A1
A2
AM335x
Address and Control
Output Buffer
DDR3 Address and Control Input Buffers
A3
AT
Vtt
Address and Control
Terminator
Rtt
AS
AS
AS-
AS+
A1
A2
AM335x
Differential Clock
Output Buffer
DDR3 Differential CK Input Buffers
Routed as Differential Pair
A3
AT
Rcp
Clock Parallel
Terminator
A1
A2
A3
AT
AS-
AS+
Rcp
Cac
VDDS_DDR
0.1 µF
+
–
+ –
+ –
AM3359, AM3358, AM3357, AM3356, AM3354, AM3352
SPRS717H – OCTOBER 2011 – REVISED MAY 2015
7.7.2.3.4.1 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.
7.7.2.3.4.1.1 CK and ADDR_CTRL Topologies, Two DDR3 Devices
shows the topology of the CK net classes and
shows the topology for the
corresponding ADDR_CTRL net classes.
Figure 7-52. CK Topology for Two DDR3 Devices
Figure 7-53. ADDR_CTRL Topology for Two DDR3 Devices
7.7.2.3.4.1.2 CK and ADDR_CTRL Routing, Two DDR3 Devices
shows the CK routing for two DDR3 devices placed on the same side of the PCB.
shows the corresponding ADDR_CTRL routing.
182
Peripheral Information and Timings
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