AM3359 datasheet(188/236 Pages) TI

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DQLMY0

DQLMX1

DQ1

DQ0

DQLMX0

DQ[8:15], DM1, DQS1

DQ[0:7], DM0, DQS0

DQLMY1

DQ0 - DQ1 represent data bytes 0 - 1.

AM3359, AM3358, AM3357

AM3356, AM3354, AM3352

SPRS717F – OCTOBER 2011 – REVISED APRIL 2013

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There are two DQLMs, one for each byte (16-bit interface). Each DQLM is the longest Manhattan distance of the byte;

therefore:

DQLM0 = DQLMX0 + DQLMY0

DQLM1 = DQLMX1 + DQLMY1

Figure 5-67. DQLM for Any Number of Allowed DDR3 Devices

Table 5-67. DQS[x] and DQ[x] Routing Specification(1)(2)

NO.

PARAMETER

MIN

TYP

MAX

UNIT

DQ0 nominal length(3)(4)

DQLM0

mils

DQ1 nominal length(3)(5)

DQLM1

mils

DQ[x] skew(6)

mils

DQS[x] skew

mils

DQS[x]-to-DQ[x] skew(6)(7)

mils

Center-to-center DQ[x] to other DDR3 trace spacing(8)(9)

Center-to-center DQ[x] to other DQ[x] trace spacing(8)(10)

DQS[x] center-to-center spacing(11)

DQS[x] center-to-center spacing to other net(8)

(1) DQS[x] represents the DQS0 and DQS1 clock net classes, and DQ[x] represents the DQ0 and DQ1 signal net classes.

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

(3) DQLMn is the longest Manhattan distance of a byte. For definition, see Section 5.6.2.3.6.2 and Figure 5-67.

(4) DQLM0 is the longest Manhattan length for the DQ0 net class.

(5) DQLM1 is the longest Manhattan length for the DQ1 net class.

(6) Length matching is only done within a byte. Length matching across bytes is not required.

(7) Each DQS clock net class is length matched to its associated DQ signal net class.

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

(9) Other DDR3 trace spacing means signals that are not part of the same DQ[x] signal net class.

(10) This applies to spacing within same DQ[x] signal net class.

(11) DQS[x] pair spacing is set to ensure proper differential impedance. Differential impedance should be Zo x 2, where Zo is the single-

ended impedance defined in Table 5-60.

188

Peripheral Information and Timings

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Product Folder Links: AM3359 AM3358 AM3357 AM3356 AM3354 AM3352

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