AM3359, AM3358, AM3357, AM3356, AM3354, AM3352
SPRS717H – OCTOBER 2011 – REVISED MAY 2015
7.7.2.3.3 DDR3 Interface
This section provides the timing specification for the DDR3 interface as a PCB design and manufacturing
specification. The design rules constrain PCB trace length, PCB trace skew, signal integrity, cross-talk,
and signal timing. These rules, when followed, result in a reliable DDR3 memory system without the need
for a complex timing closure process. For more information regarding the guidelines for using this DDR3
specification, see the
Understanding TI's PCB Routing Rule-Based DDR Timing Specification
application
report (
). This application report provides generic guidelines and approach. All the specifications
provided in the data manual take precedence over the generic guidelines and must be adhered to for a
reliable DDR3 interface operation.
7.7.2.3.3.1 DDR3 Interface Schematic
The DDR3 interface schematic varies, depending upon the width of the DDR3 devices used.
shows the schematic connections for 16-bit interface on AM335x device using one x16 DDR3 device and
shows the schematic connections for 16-bit interface on AM335x device using two x8 DDR3
devices. The AM335x DDR3 memory interface only supports 16-bit wide mode of operation. The AM335x
device can only source one load connected to the DQS[x] and DQ[x] net class signals and two loads
connected to the CK and ADDR_CTRL net class signals. For more information related to net classes, see
.
172
Peripheral Information and Timings
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