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Hardware Reference Manual for i.MX53 Quick Start
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5.7.
Full   Size   SD   Card   Connector  
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The ? full ? size ? SD ? Card ? connector ? (J5) ? is ? directly ? connected ? to ? the ? eSDHC ? channel ? 3 ? module ? of ? the ? i.MX53 ?
Applications ? processor. ? This ? card ? socket ? will ? support ? up ? to ? a ? full ? 8 ‐ bit ? data ? transfer ? from ? an ? SD ? card, ?
SDIO ? device, ? or ? MMC ? card ? inserted ? into ? the ? socket. ? The ? Quick ? Start ? board ? was ? designed ? by ? default ? not ?
to ? boot ? from ? the ? J5 ? card ? socket. ? If ? the ? developer ? wishes ? to ? boot ? from ? J5, ? the ? following ? options ? shown ? in ?
Table ? 11 ? below ? are ? available: ?
? ? ? ?
Option ?
Net ?
Condition ?
Notes: ?
Boot ? From ? J5 ? Card ? Socket ?
High ? Speed ? Operations ?
Fast ? Boot ?
SD ? Card ? Operations ?
MMC ? Card ? Operations ?
EIM_DA6 ? Pull ? High ?
EIM_A18 ? Pull ? High ?
EIM_A19 ? Pull ? High ?
EIM_A20 ? Default ? Low ?
EIM_A20 ? Pull ? High ?
Position ? 2 ? on ? DIP ? Switch ? SW1 ?
Position ? 6 ? on ? DIP ? Switch ? SW1 ?
Position ? 7 ? on ? DIP ? Switch ? SW1 ?
Position ? 8 ? on ? DIP ? Switch ? SW1 ?
Position ? 8 ? on ? DIP ? Switch ? SW1 ?
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Table ? 11. ? Full ? Size ? SD ? Card ? Boot ? Options ?
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The ? Quick ? Start ? board ? is ? configured ? to ? have ? the ? ROM ? code ? try ? to ? initiate ? boot ? operations ? in ? the ? 4 ‐ bit ?
data ? mode, ? by ? setting ? BOOT_CFG[6:5] ? to ? (01). ? Section ? 6.4.3.6 ? explains ? the ? SD/MMC ? boot ? options ? in ?
greater ? detail ? for ? the ? interested ? developer. ?
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Main ? power ? to ? the ? SD ? Card ? Connector ? is ? from ? the ? external ? LDO ? regulator ? (DCDC_3V2). ? If ? this ? regulator ? is ?
turned ? off ? for ? power ? savings ? purposes, ? the ? card ? socket ? will ? not ? function. ? It ? is ? possible ? for ? the ? developer ?
to ? cut ? the ? trace ? between ? the ? pads ? of ? SH32 ? and ? attach ? a ? different ? source ? of ? power ? to ? the ? pad ? next ? to ? the ?
card ? socket ? via ? a ? wire ? solder. ? Note ? that ? the ? eSDHC ? module ? internal ? to ? the ? i.MX53 ? processor ? is ? operating ?
at ? 3.3V, ? therefore ? it ? is ? recommended ? that ? the ? alternate ? source ? also ? be ? 3.3V. ? Cutting ? the ? SH32 ? trace ?
should ? only ? be ? used ? if ? a ? SDIO ? device ? inserted ? into ? the ? socket ? is ? drawing ? more ? power ? than ? the ? LDO ?
Regulator ? is ? capable ? of ? supplying. ?
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The ? SD3 ? Clock ? trace ? has ? a ? 22 ? Ohm ? series ? termination ? resistor ? (R212). ? 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 ? 3 ? traces ? are ?
pulled ? high ? to ? 3.2V ? (DCDC_3V2). ?
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SD3 ? Command ? (R89) ?
SD3 ? Card ? Detect ? (R88) ?
SD3 ? Write ? Protect ? (R87) ?
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Freescale Semiconductor
Hardware User Guide for i.MX53 Quick Start Board,
Preliminary Rev 0.91
53
PUBI – Public Use Business Information ?
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