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OMAP3530ECBC72 データシート(PDF) 183 Page - Texas Instruments |
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OMAP3530ECBC72 データシート(HTML) 183 Page - Texas Instruments |
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183 / 264 page  A1 A1 E0 T E1 T E2 OMAP E3 T T OMAP3530/25 Applications Processor www.ti.com SPRS507F – FEBRUARY 2008 – REVISED OCTOBER 2009 Figure 6-22 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 6-22. DQS and DQ Routing and Topology Table 6-21. DQS and DQ Routing Specification(1) NO. PARAMETER MIN TYP MAX UNIT NOTES 2 DQS E Skew Length Mismatch 25 Mils Center to Center DQS to other LPDDR 3 4w See Note(2) trace spacing 4 DQS/DQ nominal trace length DQLM - 50 DQLM DQLM + 50 Mils See Note(3) 5 DQ to DQS Skew Length Mismatch 100 Mils 6 DQ to DQ Skew Length Mismatch 100 Mils Center to Center DQ to other LPDDR 7 4w See Note(2) trace spacing Center to Center DQ to other DQ trace 8 3w See Note(2),(4) spacing 9 DQ E Skew Length Mismatch 100 Mils (1) Series terminator, if used, should be located closest to LPDDR. (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) 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. (4) DQLM is the longest Manhattan distance of the DQS and DQ net classes. Submit Documentation Feedback TIMING REQUIREMENTS AND SWITCHING CHARACTERISTICS 183 |
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