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AM1808AZCED3 Datasheet(PDF) 117 Page - Texas Instruments |
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AM1808AZCED3 Datasheet(HTML) 117 Page - Texas Instruments |
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117 / 264 page  A1 A1 A T AM1808 www.ti.com SPRS653A – FEBRUARY 2010 – REVISED APRIL 2010 6.11.3.11 DDR2/mDDR CK and ADDR_CTRL Routing 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 6-34. CK and ADDR_CTRL Routing Specification No. Parameter Min Typ Max Unit Notes 1 Center to Center CK-CKN Spacing 2w (1) See Note (2) 2 CK A to B/A to C Skew Length Mismatch 25 Mils See Note (3) 3 CK B to C Skew Length Mismatch 25 Mils 4 Center to center CK to other DDR2/mDDR trace spacing 4w (1) See Note (2) 5 CK/ADDR_CTRL nominal trace length CACLM-50 CACLM CACLM+50 Mils See Note (4) 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/mDDR trace spacing 4w (1) See Note (2) 9 Center to center ADDR_CTRL to other ADDR_CTRL trace spacing 3w (1) See Note (2) 10 ADDR_CTRL A to B/A to C Skew Length Mismatch 100 Mils See Note (3) 11 ADDR_CTRL B to C Skew Length Mismatch 100 Mils (1) w = PCB trace width as defined in Table 6-27 . (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) Series terminator, if used, should be located closest to device. (4) CACLM is the longest Manhattan distance of the CK and ADDR_CTRL net classes. Copyright © 2010, Texas Instruments Incorporated Peripheral Information and Electrical Specifications 117 Submit Documentation Feedback Product Folder Link(s): AM1808 |
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