SPRS950F December 2015 – May 2019 DRA745 , DRA746 , DRA750 , DRA756
PRODUCTION DATA.
Refer to the PDF data sheet for device specific package drawings
Figure 8-55 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 = (A'+A'') should be maximized.
NO. | PARAMETER | MIN | MAX | UNIT |
---|---|---|---|---|
RSC21 | Center-to-center ddrx_ck - ddrx_nck spacing | 2w | ||
RSC22 | ddrx_ck / ddrx_nck skew(1) | 5 | ps | |
RSC23 | CK A-to-B/A-to-C skew mismatch(2) | 10 | ps | |
RSC24 | CK B-to-C skew mismatch | 10 | ps | |
RSC25 | Center-to-center CK to other DDR2 trace spacing(3) | 4w | ||
RSC26 | CK/ADDR_CTRL trace length(4) | 680 | ps | |
RSC27 | ADDR_CTRL-to-CK skew mismatch | 25 | ps | |
RSC28 | ADDR_CTRL-to-ADDR_CTRL skew mismatch | 25 | ps | |
RSC29 | Center-to-center ADDR_CTRL to other DDR2 trace spacing(3) | 4w | ||
RSC210 | Center-to-center ADDR_CTRL to other ADDR_CTRL trace spacing(3) | 3w | ||
RSC211 | ADDR_CTRL A-to-B/A-to-C skew mismatch(2) | 25 | ps | |
RSC212 | ADDR_CTRL B-to-C skew mismatch | 25 | ps |
Figure 8-56 shows the topology and routing for the DQS and DQ net classes; the routes are point to point. Skew matching across bytes is not needed nor recommended.
NO. | PARAMETER | MIN | MAX | UNIT |
---|---|---|---|---|
RSDQ21 | Center-to-center DQS-DQSn spacing in E0|E1|E2|E3 | 2w | ||
RSDQ22 | DQS-DQSn skew in E0|E1|E2|E3 | 5 | ps | |
RSDQ23 | Center-to-center DQS to other DDR2 trace spacing(1) | 4w | ||
RSDQ24 | DQS/DQ trace length (2)(3)(4) | 325 | ps | |
RSDQ25 | DQ-to-DQS skew mismatch(2)(3)(4) | 10 | ps | |
RSDQ26 | DQ-to-DQ skew mismatch(2)(3)(4) | 10 | ps | |
RSDQ27 | DQ-to-DQ/DQS via count mismatch(2)(3)(4) | 1 | Vias | |
RSDQ28 | Center-to-center DQ to other DDR2 trace spacing(1)(5) | 4w | ||
RSDQ29 | Center-to-center DQ to other DQ trace spacing(1)(6)(7) | 3w | ||
RSDQ210 | DQ/DQS E skew mismatch(2)(3)(4) | 25 | ps |