DM3725CBC datasheet(189/280 Pages) TI

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DM3730, DM3725

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SPRS685D

– AUGUST 2010 – REVISED JULY 2011

Figure 6-22 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.

Figure 6-22. DQS and DQ Routing and Topology

Table 6-21. DQS and DQ Routing Specification(1) (6)

PARAMETER

MIN

TYP

MAX

UNIT

NOTES

DQS E Skew Length Mismatch

Mils

Center to Center DQS to other LPDDR trace

See Note(2)

spacing

DQS/DQ nominal trace length

DQLM - 50

DQLM

DQLM + 50

Mils

See Note(2)

DQ to DQS Skew Length Mismatch

100

Mils

See Note (4)

DQ to DQ Skew Length Mismatch

100

Mils

See Note (4)

Center to Center DQ to other LPDDR trace

See Note(5)

spacing

Center to Center DQ to other DQ trace

See Note(2),(3)

spacing

DQ E Skew Length Mismatch

100

Mils

(1) Series terminator, if used, should be located closest to LPDDR.

(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) DQLM is the longest Manhattan distance of the DQS and DQ net classes.

(4) There is no need, and it is not recommended, to skew match across data bytes. This specification is only relative within a data byte.

(5) DQs from other bytes are considered other LPDDR traces.

(6) Specific routing guidelines for the CUS package can be found in the AM37x CUS Routing Guidelines (SPRABD4) application note.

Timing Requirements and Switching Characteristics

189

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