AM1806 datasheet(112/241 Pages) TI

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AM1806

SPRS658B – FEBRUARY 2010 – REVISED MAY 2010

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6.11.3.11 DDR2/mDDR CK and ADDR_CTRL Routing

Figure 6-21 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 6-21. CK and ADDR_CTRL Routing and Topology

Table 6-34. CK and ADDR_CTRL Routing Specification

No.

Parameter

Min

Typ

Max

Unit

Notes

Center to Center CK-CKN Spacing

2w (1)

See Note (2)

CK A to B/A to C Skew Length Mismatch

Mils

See Note (3)

CK B to C Skew Length Mismatch

Mils

Center to center CK to other DDR2/mDDR trace spacing

4w (1)

See Note (2)

CK/ADDR_CTRL nominal trace length

CACLM-50

CACLM

CACLM+50

Mils

See Note (4)

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

4w (1)

See Note (2)

Center to center ADDR_CTRL to other ADDR_CTRL trace spacing

3w (1)

See Note (2)

ADDR_CTRL A to B/A to C Skew Length Mismatch

100

Mils

See Note (3)

ADDR_CTRL B to C Skew Length Mismatch

100

Mils

(1)

w = PCB trace width as defined in Table 6-27 .

(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)

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

(4)

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

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Peripheral Information and Electrical Specifications

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