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Developers ? should ? note ? that ? using ? different ? configurations ? of ? SDRAM ? requires ? register ? changes ? on ? the ?
i.MX53 ? Processor ? to ? ensure ? that ? timing ? and ? address ? sequencing ? is ? set ? up ? correctly. ? Software ?
initialization ? settings ? will ? be ? different ? depending ? on ? SDRAM ? configuration. ?
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5.6.
Micro   SD   Card   Connector  
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The ? microSD ? Card ? Connector ? (J4) ? is ? directly ? connected ? to ? the ? eSDHC ? channel ? 1 ? module ? of ? the ? i.MX53 ?
Applications ? processor. ? This ? card ? socket ? will ? support ? up ? to ? a ? 4 ‐ bit ? data ? transfer ? from ? an ? microSD ? card ? or ?
a ? microMMC ? card ? inserted ? into ? the ? socket. ? The ? Quick ? Start ? board ? is ? designed ? to ? boot ? a ? microSD ? Card ?
from ? the ? microSD ? card ? socket ? with ? no ? additional ? modifications. ? If ? the ? developer ? wishes ? to ? boot ? from ? a ?
microMMC ? card, ? the ? following ? options ? shown ? in ? Table ? 10 ? below ? are ? available: ?
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Option ?
Net ?
Condition ?
Notes: ?
SD ? Card ? Operations ?
MMC ? Card ? Operations ?
EIM_A20 ? Default ? Low ?
EIM_A20 ? Pull ? High ?
Position ? 8 ? on ? DIP ? Switch ? SW1 ?
Position ? 8 ? on ? DIP ? Switch ? SW1 ?
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Table ? 10. ? Micro ‐ SD ? Card ? Boot ? Options ?
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The ? main ? power ? for ? the ? microSD ? Card ? Socket ? is ? 3.3V ? from ? (VLDO3_3V3). ? This ? ensures ? that ? if ? the ? external ?
voltage ? regulator ? is ? turned ? off ? for ? power ? savings, ? the ? microSD ? Card ? Socket ? still ? has ? power. ? Power ? to ? the ?
card ? socket ? is ? through ? SH1. ? If ? the ? developer ? wants ? to ? supply ? power ? from ? a ? different ? power ? source, ? this ?
trace ? can ? be ? cut. ? The ? developer ? should ? note ? that ? the ? internal ? i.MX53 ? processor ? eSDHC ? module ? is ?
powered ? by ? a ? 3V3 ? source, ? so ? changing ? the ? voltage ? of ? the ? cards ? socket ? on ? the ? Quick ? Start ? board ? is ? not ?
recommended. ?
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The ? SD1 ? Clock ? trace ? has ? a ? 22 ? Ohm ? series ? termination ? resistor ? (R211). ? This ? resistor ? is ? inserted ? to ? prevent ?
a ? reflected ? signal ? from ? being ? sensed ? by ? the ? i.M53 ? processor. ? This ? has ? been ? found ? to ? occur ? on ? MMC ? card ?
operation ? and ? is ? recommended ? for ? all ? designs. ? In ? addition, ? the ? following ? eSDHC ? channel ? 1 ? trace ? is ? pulled ?
high ? to ? 3.3V ? (VLDO2_3V3). ?
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SD3 ? Command ? (R76) ?
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By ? default, ? the ? Quick ? Start ? board ? is ? manufactured ? with ? a ? 3M ? 29 ‐ 08 ‐ 05WB ‐ MG ? part ? for ? availability ?
reasons. ? The ? combined ? Data3/Card ? Detect ? trace ? is ? not ? supported ? by ? the ? BSP ? software. ? It ? is ? possible ? for ?
the ? developer ? to ? remove ? the ? original ? card ? socket ? and ? repopulate ? the ? position ? with ? an ? alternate ? microSD ?
Card ? Socket ? made ? by ? Proconn, ? MSPN09 ‐ A0 ‐ 2000. ? The ? developer ? should ? also ? then ? populate ? R108 ? with ? a ?
suitable ? pull ‐ up ? resistor ? (10K). ? This ? will ? then ? give ? the ? developer ? the ? option ? to ? use ? the ? card ? detect ? trace ?
for ? channel ? 1 ? connected ? to ? EIM_DA13 ? (pin ? AC7). ?
? ?
Freescale Semiconductor
Hardware User Guide for i.MX53 Quick Start Board,
Preliminary Rev 0.91
52
PUBI – Public Use Business Information ?
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