AM3359 datasheet(152/195 Pages) TI

152 / 195 page

AM335x

DQ[0]

DQ[1]

AM3359, AM3358, AM3357

AM3356, AM3354, AM3352

SPRS717B

– OCTOBER 2011 – REVISED JANUARY 2012

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5.4.2.2.3 DDR2 CK and ADDR_CTRL Routing

Figure 5-39 shows the topology of the routing for the CK and ADDR_CTRL net classes. The length of

signal path AB and AC should be minimized with emphasis to minimize lengths C and D such that length

A is the majority of the total length of signal path AB and AC.

Figure 5-39. CK and ADDR_CTRL Routing and Topology

Table 5-47. CK and ADDR_CTRL Routing Specification(1)(2)

NO.

PARAMETER

MIN

TYP

MAX

UNIT

Center-to-center CK spacing

CK differential pair skew length mismatch(2)(3)

mils

CK B-to-CK C skew length mismatch

mils

Center-to-center CK to other DDR2 trace spacing(4)

CK/ADDR_CTRL nominal trace length(5)

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(4)

Center-to-center ADDR_CTRL to other ADDR_CTRL trace spacing(4)

ADDR_CTRL A-to-B/ADDR_CTRL A-to-C skew length mismatch(2)

100

mils

ADDR_CTRL B-to-C skew length mismatch

100

mils

(1) CK represents the clock net class, and ADDR_CTRL represents the address and control signal net class.

(2) Series terminator, if used, should be located closest to the AM335x device.

(3) Differential impedance should be Zo x 2, where Zo is the single-ended impedance defined in Table 5-39.

(4) 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.

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

Figure 5-40 shows the topology and routing for the DQS[x] and DQ[x] net classes; the routes are point to

point. Skew matching across bytes is not needed nor recommended.

Figure 5-40. DQS[x] and DQ[x] Routing and Topology

152

Peripheral Information and Timings

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Product Folder Link(s): AM3359 AM3358 AM3357 AM3356 AM3354 AM3352

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