AM3892 datasheet(182/299 Pages) TI

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AM3894

AM3892

SPRS681A – OCTOBER 2010 – REVISED MARCH 2011

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Table 8-25. Data Routing Specification(1)

NO.

PARAMETER

MIN

TYP

MAX

UNIT

DB0 nominal length(2)(3)

DQLM0

mils

DB1 nominal length(2)(4)

DQLM1

mils

DB2 nominal length(2)(5)

DQLM2

mils

DB3 nominal length(2)(6)

DQLM3

mils

DBn skew(7)

mils

DQSn+ to DQSn- skew

mils

DQSn to DBn skew(7)(8)

mils

Center-to-center DBn to other DDR3 trace spacing(9)(10)

Center-to-center DBn to other DBn trace spacing(9)(11)

DQSn center-to-center spacing(12)

DQSn center-to-center spacing to other net(9)

(1)

External termination disallowed. Data termination should use built-in ODT functionality.

(2)

DQLMn is the longest Manhattan distance of a byte. For definition, see Section 8.3.2.16.2 and Figure 8-39.

(3)

DQLM0 is the longest Manhattan length for the net classes of Byte 0.

(4)

DQLM1 is the longest Manhattan length for the net classes of Byte 1.

(5)

DQLM2 is the longest Manhattan length for the net classes of Byte 2.

(6)

DQLM3 is the longest Manhattan length for the net slasses of Byte 3.

(7)

Length matching is only done within a byte. Length matching across bytes is neither required nor recommended.

(8)

Each DQS pair is length matched to its associated byte.

(9)

Center-to-center spacing is allowed to fall to minimum for up to 1250 mils of routed length.

(10) Other DDR3 trace spacing means other DDR3 net classes not within the byte.

(11) This applies to spacing within the net classes of a byte.

(12) DQS pair spacing is set to ensure proper differential impedance.

182

Peripheral Information and Timings

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