ZHCSG69E November 2016 – May 2018 DM505
PRODUCTION DATA.
CK signals are routed as point-to-point differential, and ADDR_CTRL signals are routed as point-to-point single ended. The supported topology for CK and ADDR_CTRL are shown in Figure 7-32 through Figure 7-35. Note that ADDR_CTRL are routed very similar to DQ and CK is routed very similar to DQS.
Figure 7-32 CK Signals Topology
Figure 7-33 ADDR_CTRL Signals Topology
Figure 7-34 CK Signals Routing
Figure 7-35 ADDR_CTRL Signals Routing
Trace routing specifications for the CK and the ADD_CTRL are specified in Table 7-21.
| NO. | PARAMETER | MIN | TYP | MAX | UNIT |
|---|---|---|---|---|---|
| 1 | CK and ADDR_CTRL nominal trace length(1) | CACLM | mils | ||
| 2 | ADDR_CTRL skew | 20 | ps | ||
| 3 | CK skew | 5 | ps | ||
| 4 | Via count per each trace ADDR_CTRL, CK | 2 | |||
| 5 | Via count difference across ADDR_CTRL, CK | 0 | |||
| 6 | ADDR_CTRL-to-CK skew | 20 | ps | ||
| 7 | Center-to-center ADDR_CTRL to other LPDDR2 trace spacing(2)(3) | 4 | w | ||
| 8 | Center-to-center ADDR_CTRL to other ADDR_CTRL trace spacing(2) | 3 | w | ||
| 9 | CK center-to-center spacing(4) | ||||
| 10 | CK center-to-center spacing to other net(2) | 4 | w |