OMAP3530ECUS datasheet(184/265 Pages) TI1

184 / 265 page

OMAP

OMAP3530, OMAP3525

SPRS507H – FEBRUARY 2008 – REVISED OCTOBER 2013

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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)

NO.

PARAMETER

MIN

TYP

MAX

UNIT

NOTES

DQS E Skew Length Mismatch

Mils

Center to Center DQS to other LPDDR

See Note(2)

trace spacing

DQS/DQ nominal trace length

DQLM - 50

DQLM

DQLM + 50

Mils

See Note(3)

DQ to DQS Skew Length Mismatch

100

Mils

DQ to DQ Skew Length Mismatch

100

Mils

Center to Center DQ to other LPDDR

See Note(2)

trace spacing

Center to Center DQ to other DQ trace

See Note(2),(4)

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)

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.

(4)

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

184

TIMING REQUIREMENTS AND SWITCHING CHARACTERISTICS

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