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LPDDRDevice

RegionshouldencompassallLPDDRcircuitryandvariesdepending

onplacement.Non-LPDDRsignalsshouldnotberoutedonthe

LPDDRsignallayerswithintheLPDDRkeepoutregion.Non-LPDDR

signalsmayberoutedintheregionprovidedtheyareroutedon

layersseparatedfromLPDDRsignallayersbyagroundlayer.No

breaksshouldbeallowedinthereferencegroundlayersinthis

region.Inaddition,the1.8Vpowerplaneshouldcovertheentirekeep

outregion.

6.4.2.5 Net Classes

6.4.2.6 LPDDR Signal Termination

OMAP3530/25 Applications Processor

www.ti.com

SPRS507F – FEBRUARY 2008 – REVISED OCTOBER 2009

Figure 6-20. LPDDR Keepout Region

Table 6-17 lists the clock net classes for the LPDDR interface. Table 6-18 lists the signal net classes, and

associated clock net classes, for the signals in the LPDDR interface. These net classes are used for the

termination and routing rules that follow.

Table 6-17. Clock Net Class Definitions

CLOCK NET CLASS

OMAP PIN NAMES

sdrc_clk/sdrc_nclk

DQS0

sdrc_dqs0

DQS1

sdrc_dqs1

DQS2

sdrc_dqs2

DQS3

sdrc_dqs3

Table 6-18. Signal Net Class Definitions

CLOCK NET CLASS

ASSOCIATED CLOCK NET CLASS

OMAP PIN NAMES

sdrc_ba, sdrc_a, sdrc_ncs0, sdrc_ncas,

ADDR_CTRL

sdrc_nras, sdrc_nwe, sdrc_cke0

DQ0

DQS0

sdrc_d, sdrc_dm0

DQ1

DQS1

sdrc_d, sdrc_dm1

DQ2

DQS2

sdrc_d, sdrc_dm2

DQ3

DQS3

sdrc_d, sdrc_dm3

No terminations of any kind are required in order to meet signal integrity and overshoot requirements.

Serial terminators are permitted, if desired, to reduce EMI risk; however, serial terminations are the only

type permitted. Table 6-19 shows the specifications for the series terminators.

Table 6-19. LPDDR Signal Terminations

NO.

PARAMETER

MIN

TYP

MAX

UNIT

NOTES

CK Net Class

Ω

See Note(1)

(1)

Only series termination is permitted, parallel or SST specifically disallowed.

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