ZHCSGV2J June 2009 – January 2017 OMAP-L138
PRODUCTION DATA.
Figure 6-23 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.
NO. | PARAMETER | MIN | TYP | MAX | UNIT |
---|---|---|---|---|---|
1 | Center to Center CK-CKN Spacing(3) | 2w(4) | |||
2 | CK A to B/A to C Skew Length Mismatch(1) | 25 | Mils | ||
3 | CK B to C Skew Length Mismatch | 25 | Mils | ||
4 | Center to center CK to other DDR2/mDDR trace spacing(3) | 4w(4) | |||
5 | CK/ADDR_CTRL nominal trace length(2) | 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/mDDR trace spacing(3) | 4w(4) | |||
9 | Center to center ADDR_CTRL to other ADDR_CTRL trace spacing(3) | 3w (4) | |||
10 | ADDR_CTRL A to B/A to C Skew Length Mismatch(1) | 100 | Mils | ||
11 | ADDR_CTRL B to C Skew Length Mismatch | 100 | Mils |
Figure 6-24 shows the topology and routing for the DQS and D net class; 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 to other DDR2/mDDR trace spacing(4) | 4w(6) | |||
2 | DQS/D nominal trace length(1)(3) | DQLM-50 | DQLM | DQLM+50 | Mils |
3 | D to DQS Skew Length Mismatch(3) | 100 | Mils | ||
4 | D to D Skew Length Mismatch(3) | 100 | Mils | ||
5 | Center to center D to other DDR2/mDDR trace spacing(4)(5) | 4w(6) | |||
6 | Center to Center D to other D trace spacing(4)(2) | 3w(6) |
Figure 6-25 shows the routing for the DQGATE net class. Table 6-38 contains the routing specification.
NO. | PARAMETER | MIN | TYP | MAX | UNIT |
---|---|---|---|---|---|
1 | DQGATE Length F | CKB0B(1) | |||
2 | Center to center DQGATE to any other trace spacing | 4w(3) | |||
3 | DQS/D nominal trace length | DQLM-50 | DQLM | DQLM+50 | Mils |
4 | DQGATE Skew(2) | 100 | Mils |