A1
A1
X
Y
OFFSET
Recommended LPDDR
Device Orientation
Y
Y
OFFSET
LPDDR
Device
LPDDR
Interface
AM335x
AM3359, AM3358, AM3357, AM3356, AM3354, AM3352
www.ti.com
SPRS717H –OCTOBER 2011–REVISED MAY 2015
7.7.2.1.2.4 Placement
Figure 7-34 shows the required placement for the LPDDR devices. The dimensions for this figure are
defined in Table 7-35. The placement does not restrict the side of the PCB on which the devices are
mounted. The ultimate purpose of the placement is to limit the maximum trace lengths and allow for
proper routing space. For single-memory LPDDR systems, the second LPDDR device is omitted from the
placement.
Figure 7-34. AM335x Device and LPDDR Device Placement
Table 7-35. Placement Specifications
(1)
NO. PARAMETER MIN MAX UNIT
1 X
(2)(3)
1750 mils
2 Y
(2)(3)
1280 mils
3 Y Offset
(2)(3)(4)
650 mils
4 Clearance from non-LPDDR signal to LPDDR keepout region
(5)(6)
4 w
(1) LPDDR keepout region to encompass entire LPDDR routing area.
(2) For dimension definitions, see Figure 7-34.
(3) Measurements from center of AM335x device to center of LPDDR device.
(4) For single-memory systems, TI recommends that Y offset be as small as possible.
(5) w is defined as the signal trace width.
(6) Non-LPDDR signals allowed within LPDDR keepout region provided they are separated from LPDDR routing layers by a ground plane.
Copyright © 2011–2015, Texas Instruments Incorporated Peripheral Information and Timings 153
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