AM3874 datasheet(283/361 Pages) TI

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Recommended DDR2 Device

Orientation

OFFSET

AM3874, AM3871

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SPRS695C – SEPTEMBER 2011 – REVISED DECEMBER 2013

8.13.4.1.1.4 Placement

Figure 8-49 shows the required placement for the MPU as well as the DDR2 devices. The dimensions for

this figure are defined in Table 8-57. 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 a 16-bit DDR memory system, the high-word DDR2 device is omitted

from the placement.

Figure 8-49. AM387x Device and DDR2 Device Placement

Table 8-57. Placement Specifications

NO.

PARAMETER

MIN

MAX

UNIT

X + Y(1)(2)

1660

Mils

X'(1)(2)

1280

Mils

X' Offset(1)(2) (3)

650

Mils

DDR2 keepout region(4)

Clearance from non-DDR2 signal to DDR2 keepout region(5)

(1)

For dimension definitions, see Figure 8-47.

(2)

Measurements from center of MPU to center of DDR2 device.

(3)

For 16-bit memory systems, it is recommended that X' offset be as small as possible.

(4)

DDR2 keepout region to encompass entire DDR2 routing area.

(5)

Non-DDR2 signals allowed within DDR2 keepout region provided they are separated from DDR2 routing layers by a ground plane.

Peripheral Information and Timings

283

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