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Hardware Reference Manual for i.MX53 Quick Start
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5.13. USB   Host   connections  
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The ? i.MX53 ? Applications ? Processors ? contains ? three ? USB ? 2.0 ? Host ? ports ? and ? one ? USB ? 2.0 ? OTG ? port. ? Of ?
these ? four ? ports, ? only ? two ? (Host1 ? and ? OTG) ? are ? connected ? internally ? to ? a ? transceiver ? to ? provide ? USB ?
Data ? signals ? suitable ? (UTMI) ? for ? direct ? connection ? to ? a ? USB ? jack. ? The ? other ? two ? (Host2 ? and ? Host3) ? ports ?
require ? a ? connection ? to ? an ? external ? serial ? transceiver ? or ? a ? direct ? connection ? to ? another ? USB ? device ? using ?
ULPI ? communications. ? On ? the ? Quick ? Start ? board, ? only ? the ? Host1 ? and ? OTG ? ports ? are ? utilized ?
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The ? Host1 ? USB ? Port ? is ? connected ? to ? the ? Upper ? USB ‐ A ? Host ? slot ? of ? the ? Ethernet/Dual ? USB ? Connector ? (J2). ?
A ? Common ? Mode ? Choke ? is ? inserted ? in ? the ? USB ? data ? lines ? to ? ensure ? compliance ? with ? North ? America ? and ?
Europe ? emissions ? testing. ? The ? 5V ‐ Main ? power ? rail ? is ? connected ? to ? the ? USB_5V ? pins ? of ? the ? Ethernet/Dual ?
USB ? Connector, ? after ? first ? going ? through ? a ? 1.1A ? fuse ? for ? over ‐ current ? protection ? and ? a ? PNP ? MOSFET ? to ?
allow ? the ? Processor ? to ? control ? USB_5V ? power ? (USB_PWREN). ? No ? attempt ? is ? made ? on ? the ? Quick ? Start ?
board ? to ? regulate ? the ? actual ? voltage ? level ? of ? this ? power ? rail, ? nor ? to ? regulate ? the ? amount ? of ? current ? drawn ?
by ? each ? port ? (except ? by ? the ? 1.1A ? fuse). ? Power ? from ? the ? DCDC_3V2 ? and ? the ? VBUS_2V5 ? voltage ? rails ? are ?
supplied ? to ? the ? HOST1 ? part ? through ? small ? value ? resistors ? for ? noise ? filtering. ? The ? USB_H1_VBUS ? is ? a ?
reference ? voltage ? signal ? only ? and ? is ? provide ? by ? the ? 5V_Main ? power ? rail ? via ? the ? USB ? Bus ? Power ? control ?
MOSFET. ?
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In ? much ? the ? same ? way ? as ? described ? above, ? the ? OTG ? Port ? is ? connected ? to ? the ? Lower ? USB ‐ A ? Host ? slot ? of ?
the ? Ethernet/Dual ? USB ? Connector ? (J2). ? The ? USB_5V ? power ? source ? is ? the ? same ? source ? as ? supplied ? to ? the ?
upper ? port, ? but ? the ? USB ? OTG ? data ? lines ? go ? through ? a ? separate ? Common ? Mode ? Choke. ? The ? difference ?
between ? the ? Host1 ? and ? the ? OTG ? Port ? connections ? is ? that ? the ? OTG ? Port ? is ? also ? connected ? to ? a ? Micro ‐ B ?
USB ? Device ? port. ? In ? the ? normal ? implementation ? of ? OTG, ? the ? same ? connector ? is ? used ? for ? both ? Host ? and ?
Device ? USB ? connections. ? A ? high ? or ? low ? signal ? on ? the ? USB ? ID ? pin ? would ? indicate ? whether ? a ? Host ? (A) ? plug ?
or ? a ? Device ? (B) ? plug ? was ? attached. ? Since ? most ? Host ? plugs ? available ? today ? are ? the ? full ? size ? plugs, ? but ? most ?
portable ? USB ? Devices ? are ? moving ? toward ? the ? Micro ‐ B ? connector, ? a ? two ? connector ? approach ? was ?
implemented ? on ? the ? Quick ? Start ? board. ? The ? USB_5V ? power ? supplied ? by ? an ? attached ? Host ? device ? through ?
the ? Micro ‐ B ? connector ? will ? provide ? a ? TTL ? logic ? high ? signal ? to ? the ? OTG ? Port ? through ? USB_OTG_ID ? (pin ?
C16). ? The ? ID ? signal ? is ? corrected ? to ? the ? proper ? logic ? by ? way ? of ? a ? simple ? voltage ? divider. ? When ? the ? OTG ?
Port ? senses ? this ? logic ? high ? condition, ? the ? OTG ? Port ? will ? switch ? to ? device ? operations, ? regardless ? of ?
whether ? there ? is ? a ? USB ? Device ? plugged ? into ? the ? Lower ? USB ? Host ? Port. ? This ? USB ? OTG ? configuration ? is ? used ?
for ? demonstration ? purposes ? only ? and ? is ? not ? recommended ? for ? mass ? production. ? The ? developer ? is ?
cautioned ? to ? only ? plug ? one ? cable ? into ? the ? Lower ? USB ? Host ? Port ? OR ? the ? micro ‐ B ? Device ? port ? at ? a ? time, ?
since ? two ? cables ? might ? degrade ? the ? USB ? signal ? beyond ? acceptable ? operating ? limits. ?
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The ? External ? USB ? 5V ? power ? supplied ? by ? a ? connected ? USB ? device ? is ? only ? used ? in ? two ? locations ? on ? the ?
Quick ? Start ? board. ? It ? is ? used ? to ? provide ? the ? USB ? ID ? signal ? (passive ? sense) ? and ? to ? provide ? the ?
USB_OTG_VBUS ? reference ? signal. ? For ? the ? board ? designer, ? two ? 6.04K ? Ohm ? 1% ? resistors ? are ? used, ? one ?
attached ? to ? each ? of ? the ? Host1 ? and ? OTG ? Ports. ? These ? resistors ? are ? used ? to ? set ? the ? Band ? Gap ? levels. ?
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Freescale Semiconductor
Hardware User Guide for i.MX53 Quick Start Board,
Preliminary Rev 0.91
59
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