AM1808_1008 Datasheet, PDF (112/264 Pages) Texas Instruments – AM1808 ARM Microprocessor

AM1808
SPRS653A – FEBRUARY 2010 – REVISED APRIL 2010
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6.11.3.4 Placement
Figure 6-17 shows the required placement for the device as well as the DDR2/mDDR devices. The
dimensions for Figure 6-18 are defined in Table 6-28. The placement does not restrict the side of the PCB
that the devices are mounted on. The ultimate purpose of the placement is to limit the maximum trace
lengths and allow for proper routing space. For single-memory DDR2/mDDR systems, the second
DDR2/mDDR device is omitted from the placement.
X
A1
Y
OFFSET
Y ^DDR2/mDDR
Device
Y
OFFSET
A1
Recommended DDR2/mDDR
Device Orientation
Figure 6-18. Device and DDR2/mDDR Device Placement
Table 6-28. Placement Specifications
No. Parameter
1X
2Y
3 Y Offset
4 Clearance from non-DDR2/mDDR signal to DDR2/mDDR Keepout Region
Min Max Unit
Notes
1750 Mils See Notes ⁽¹⁾, ⁽²⁾
1280 Mils See Notes ⁽¹⁾, ⁽²⁾
650 Mils See Notes ⁽¹⁾. ⁽²⁾, ⁽³⁾
4
w ⁽⁴⁾ See Note ⁽⁵⁾
(1) See Figure 6-18 for dimension definitions.
(2) Measurements from center of device to center of DDR2/mDDR device.
(3) For single memory systems it is recommended that Y Offset be as small as possible.
(4) w = PCB trace width as defined in Table 6-27 .
(5) Non-DDR2/mDDR signals allowed within DDR2/mDDR keepout region provided they are separated from DDR2/mDDR routing layers by
a ground plane.
112 Peripheral Information and Electrical Specifications
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