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DM385 参数 Datasheet PDF下载

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型号: DM385
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内容描述: DM385和DM388 DaVincia ? ¢数字媒体处理器 [DM385 and DM388 DaVinci™ Digital Media Processor]
分类和应用:
文件页数/大小: 280 页 / 2479 K
品牌: TI [ TEXAS INSTRUMENTS ]
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DM385, DM388  
www.ti.com  
SPRS821D MARCH 2013REVISED DECEMBER 2013  
8.13.2.2.4 Placement  
Figure 8-50 shows the required placement for the processor as well as the DDR2 devices. The  
dimensions for this figure are defined in Table 8-51. 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.  
Recommended DDR2 Device  
Orientation  
X
1
X
A1  
A1  
1
1
X
X
OFFSET OFFSET  
Y
Figure 8-50. Device and DDR2 Device Placement  
Table 8-51. Placement Specifications  
NO.  
1
PARAMETER  
MIN  
MAX  
1660  
1280  
650  
UNIT  
Mils  
Mils  
Mils  
X + Y(1)(2)  
X'(1)(2)  
X' Offset(1)(2) (3)  
DDR2 keepout region(4)  
2
3
4
5
Clearance from non-DDR2 signal to DDR2 keepout region(5)  
4
w
(1) For dimension definitions, see Figure 8-48.  
(2) Measurements from center of processor 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.  
Copyright © 2013, Texas Instruments Incorporated  
Peripheral Information and Timings  
223  
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Product Folder Links: DM385 DM388  
 
 
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