AMPL138ZCE3 datasheet(123/268 Pages) TI

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6.11.3.11 DDR2/mDDR CK and ADDR_CTRL Routing

OMAP-L138 Low-Power Applications Processor

www.ti.com

SPRS586A – JUNE 2009 – REVISED AUGUST 2009

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.

Figure 6-23. CK and ADDR_CTRL Routing and Topology

Table 6-35. CK and ADDR_CTRL Routing Specification

No.

Parameter

Min

Typ

Max

Unit

Notes

CK A to B/A to C Skew Length Mismatch

Mils

See Note (1)

CK B to C Skew Length Mismatch

Mils

Center to center CK to other DDR2/mDDR trace spacing

See Note (2)

CK/ADDR_CTRL nominal trace length

CACLM-50

CACLM

CACLM+50

Mils

See Note (3)

ADDR_CTRL to CK Skew Length Mismatch

100

Mils

ADDR_CTRL to ADDR_CTRL Skew Length Mismatch

100

Mils

Center to center ADDR_CTRL to other DDR2/mDDR trace spacing

See Note (2)

Center to center ADDR_CTRL to other ADDR_CTRL trace spacing

See Note (2)

ADDR_CTRL A to B/A to C Skew Length Mismatch

100

Mils

See Note (1)

ADDR_CTRL B to C Skew Length Mismatch

100

Mils

(1)

Series terminator, if used, should be located closest to Soc.

(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)

CACLM is the longest Manhattan distance of the CK and ADDR_CTRL net classes.

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