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TMS320DM647 数据表(PDF) 105 Page - Texas Instruments

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部件名 TMS320DM647
功能描述  Digital Media Processor
PDF  182 Pages
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

TMS320DM647 数据表(HTML) 105 Page - Texas Instruments

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A1
A1
E0
T
E1
T
E2
DM648
E3
T
T
TMS320DM647/TMS320DM648
Digital Media Processor
www.ti.com
SPRS372B – MAY 2007 – REVISED APRIL 2008
Table 6-37. CK and ADDR_CTRL Routing Specification (1)
NO
PARAMETER
MIN
TYP
MAX
UNIT
1
Center to center CK-CK spacing
2w
2
CK A to B/A to C Skew Length Mismatch(1)
25
Mils
3
CK B to C Skew Length Mismatch
25
Mils
4
Center to center CK to other DDR2 trace spacing(2)
4w
5
CK/ADDR_CTRL nominal trace length(3)
CACLM-50
CACLM
CACLM+50
Mils
6
ADDR_CTRL to CK Skew Length Mismatch
100
Mils
7
ADDR_CTRL to ADDR_CTRL Skew Length Mismatch
100
Mils
8
Center to center ADDR_CTRL to other DDR2 trace spacing(2)
4w
9
Center to center ADDR_CTRL to other ADDR_CTRL trace spacing(2)
3w
10
ADDR_CTRL A to B/A to C Skew Length Mismatch(1)
100
Mils
11
ADDR_CTRL B to C Skew Length Mismatch
100
Mils
(1)
Series terminator, if used, should be located closest to DSP.
(2)
Center to center spacing is allowed to fall to minimum (w) for up to 500 mils of routed length to accommodate BGA escape and routing
congestion.
(3)
CACLM is the longest Manhattan distance of the CK and ADDR_CTRL net classes.
Figure 6-18 shows the topology and routing for the DQS and DQ net classes; the routes are point to point.
Skew matching across bytes is not needed nor recommended.
Figure 6-18. DQS and DQ Routing and Toplogy
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Peripheral Information and Electrical Specifications
105



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