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TMS320DM647 数据表(PDF) 98 Page - Texas Instruments |
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TMS320DM647 数据表(HTML) 98 Page - Texas Instruments |
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98 / 181 page ![]() A1 A1 X Y OFFSET RecommendedDDR2Device Orientation Y Y OFFSET DDR2 Device DM648 A1 A1 DDR2Device TMS320DM647 TMS320DM648 SPRS372F – JANUARY 2010 – REVISED SEPTEMBER 2009 www.ti.com A. DM648 is shown in this figure as an example of the device and represents the entire set of devices that include: DM647/DM648. Figure 6-13. DDR2 Device Placement Table 6-31. Placement Specifications NO. PARAMETER MIN MAX UNIT 1 X(1) (2) 1660 Mils 2 Y(1) (2) 1280 Mils 3 Y Offset(1) (2) (3) 650 Mils 4 DDR2 Keepout Region(4) 5 Clearance from non-DDR2 signal to DDR2 Keepout Region(5) 4 w (1) See Figure 6-11 for dimension defintions. (2) Measurements from center of DSP device to center of DDR2 device. (3) For 16-bit memory systems, it is recommended that Y 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. 6.9.3.5 DDR2 Keep Out Region The region of the PCB used for the DDR2 circuitry must be isolated from other signals. The DDR2 keep out region is defined for this purpose and is shown in Figure 6-14. The size of this region varies with the placement and DDR routing. Additional clearances required for the keep out region are shown in Table 6-31. Figure 6-14. DDR2 Keepout Region 98 Peripheral Information and Electrical Specifications Copyright © 2010–2009, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): TMS320DM647 TMS320DM648 |
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