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OMAP3530ECUS 数据表(PDF) 182 Page - Texas Instruments |
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OMAP3530ECUS 数据表(HTML) 182 Page - Texas Instruments |
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182 / 264 page  6.4.2.7 LPDDR CK and ADDR_CTRL Routing A1 A1 A T OMAP OMAP3530/25 Applications Processor SPRS507F – FEBRUARY 2008 – REVISED OCTOBER 2009 www.ti.com Table 6-19. LPDDR Signal Terminations (continued) NO. PARAMETER MIN TYP MAX UNIT NOTES 2 ADDR_CTRL Net Class 0 22 Zo Ω See Notes(1),(2),(3) Data Byte Net Classes 3 0 22 Zo Ω See Notes(1),(2),(3) (DQS0-DQS3, DQ0-DQ3) (2) Terminator values larger than typical only recommended to address EMI issues. (3) Termination value should be uniform across net class. Figure 6-21 shows the topology of the routing for the CK and ADDR_CTRL net classes. The route is a balanced T as it is intended that the length of segments B and C be equal. In addition, the length of A should be maximized. Figure 6-21. CK and ADDR_CTRL Routing and Topology Table 6-20. CK and ADDR_CTRL Routing Specification NO. PARAMETER MIN TYP MAX UNIT NOTES 1 Center to Center CK-CK spacing 2w 2 CK A to B/A to C Skew Length Mismatch 25 Mils See Note(1) 3 CK B to C Skew Length Mismatch 25 Mils Center to Center CK to other 4 4w See Note(2) LPDDR trace spacing 5 CK/ADDR_CTRL nominal trace length CACLM-50 CACLM CACLM+50 Mils See Note(3) 6 ADDR_CTRL to CK Skew Length Mismatch 100 Mils ADDR_CTRL to ADDR_CTRL 7 100 Mils Skew Length Mismatch Center to Center ADDR_CTRL to other 8 4w See Note(2) LPDDR trace 4w spacing Center to Center ADDR_CTRL to other 9 3w See Note(2) ADDR_CTRL 3w trace spacing ADDR_CTRL A to B/A to C Skew Length 10 100 Mils See Note(1) Mismatch 11 ADDR_CTRL B to C Skew Length Mismatch 100 Mils (1) Series terminator, if used, should be located closest to device. (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. TIMING REQUIREMENTS AND SWITCHING CHARACTERISTICS 182 Submit Documentation Feedback |
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