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5.6.2.1.2.4 Placement
Figure 5-34 shows the required placement for the LPDDR devices. The dimensions for this figure are
defined in Table 5-35. 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.
X
A1
Y
OFFSET
LPDDR
Y
Device
Y
OFFSET
AM335x
A1
Recommended LPDDR
Device Orientation
Figure 5-34. AM335x Device and LPDDR Device Placement
Table 5-35. Placement Specifications(1)
NO.
1
PARAMETER
MIN
MAX
1750
1280
650
UNIT
mils
mils
mils
w
X(2)(3)
Y(2)(3)
Y Offset(2)(3)(4)
2
3
4
Clearance from non-LPDDR signal to LPDDR keepout region(5)(6)
4
(1) LPDDR keepout region to encompass entire LPDDR routing area.
(2) For dimension definitions, see Figure 5-34.
(3) Measurements from center of AM335x device to center of LPDDR device.
(4) For single-memory systems, it is recommended 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.
152
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