TMS320C6748 Datasheet, PDF (100/242 Pages) Texas Instruments – Fixed/Floating-Point DSP

TMS320C6748 Fixed/Floating-Point DSP
SPRS590 – JUNE 2009
www.ti.com
6.11.3.4 Placement
Figure 6-19 shows the required placement for the C6748 device as well as the DDR2/mDDR devices. The
dimensions for Figure 6-20 are defined in Table 6-27. 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 6-20. C6748 and DDR2/mDDR Device Placement
Table 6-27. 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 See Note ⁽⁴⁾
(1) See Figure 6-20 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) Non-DDR2/mDDR signals allowed within DDR2/mDDR keepout region provided they are separated from DDR2/mDDR routing layers by
a ground plane.
100 Peripheral Information and Electrical Specifications
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