SLUSC35B April 2015 – April 2019 AM3358-EP
PRODUCTION DATA.
Figure 7-44 shows the topology of the routing for the CK and ADDR_CTRL net classes. The length of signal path AB and AC should be minimized with emphasis to minimize lengths C and D such that length A is the majority of the total length of signal path AB and AC.
NO. | PARAMETER | MIN | TYP | MAX | UNIT |
---|---|---|---|---|---|
1 | Center-to-center CK spacing | 2w | |||
2 | CK differential pair skew length mismatch(2)(3) | 25 | mils | ||
3 | CK B-to-CK C skew length mismatch | 25 | mils | ||
4 | Center-to-center CK to other DDR2 trace spacing(4) | 4w | |||
5 | CK and ADDR_CTRL nominal trace length(5) | 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(4) | 4w | |||
9 | Center-to-center ADDR_CTRL to other ADDR_CTRL trace spacing(4) | 3w | |||
10 | ADDR_CTRL A-to-B and ADDR_CTRL A-to-C skew length mismatch(2) | 100 | mils | ||
11 | ADDR_CTRL B-to-C skew length mismatch | 100 | mils |
Figure 7-45 shows the topology and routing for the DQS[x] and DQ[x] net classes; the routes are point to point. Skew matching across bytes is not needed nor recommended.
NO. | PARAMETER | MIN | TYP | MAX | UNIT |
---|---|---|---|---|---|
1 | Center-to-center DQS[x] spacing | 2w | |||
2 | DQS[x] differential pair skew length mismatch(2) | 25 | mils | ||
3 | Center-to-center DDR_DQS[x] to other DDR2 trace spacing(3) | 4w | |||
4 | DQS[x] and DQ[x] nominal trace length(4) | DQLM-50 | DQLM | DQLM+50 | mils |
5 | DQ[x]-to-DQS[x] skew length mismatch(4) | 100 | mils | ||
6 | DQ[x]-to-DQ[x] skew length mismatch(4) | 100 | mils | ||
7 | Center-to-center DQ[x] to other DDR2 trace spacing(3)(5) | 4w | |||
8 | Center-to-center DQ[x] to other DQ[x] trace spacing(3)(6) | 3w |