TMS320DM647 datasheet(105/182 Pages) TI

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DM648

TMS320DM647/TMS320DM648

Digital Media Processor

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SPRS372B – MAY 2007 – REVISED APRIL 2008

Table 6-37. CK and ADDR_CTRL Routing Specification (1)

PARAMETER

MIN

TYP

MAX

UNIT

Center to center CK-CK spacing

CK A to B/A to C Skew Length Mismatch(1)

Mils

CK B to C Skew Length Mismatch

Mils

Center to center CK to other DDR2 trace spacing(2)

CK/ADDR_CTRL nominal trace length(3)

CACLM-50

CACLM

CACLM+50

Mils

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 trace spacing(2)

Center to center ADDR_CTRL to other ADDR_CTRL trace spacing(2)

ADDR_CTRL A to B/A to C Skew Length Mismatch(1)

100

Mils

ADDR_CTRL B to C Skew Length Mismatch

100

Mils

(1)

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

(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.

Figure 6-18 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 6-18. DQS and DQ Routing and Toplogy

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