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5.4.3. Clock   Signals  
 
The ? Quick ? Start ? board ? has ? three ? external ? clocks, ? two ? of ? which ? are ? dedicated ? to ? the ? i.MX53 ? Processor, ?
and ? one ? dedicated ? to ? the ? Ethernet ? PHY. ? The ? 24 ? MHz ? crystal ? (Y1) ? is ? the ? main ? clock ? source ? for ? the ?
Processor. ? The ? crystal ? is ? located ? on ? the ? bottom ? side ? of ? the ? board ? as ? shown ? in ? Figure ? 18 . ? It ? is ? driven ? by ? its ?
own ? 2.5V ? supply ? pin, ? NVCC_XTAL. ? Although ? the ? crystal ? frequency ? for ? the ? board ? is ? set ? to ? be ? 24MHz, ? the ?
default ? BOOT_CFG2[2] ? pin ? that ? controls ? specifying ? the ? frequency ? is ? left ? to ? auto ? detect. ? In ? the ? case ? of ?
24MHz, ? the ? actual ? setting ? is ? not ? important. ? If ? a ? clock ? oscillator ? is ? used, ? it ? would ? be ? connected ? to ? the ? pin ?
EXTAL ? (AB11) ? and ? the ? pin ? XTAL ? (AC11) ? should ? be ? left ? floating. ? The ? 24 ? MHz ? clock ? signal ? can ? be ? output ?
from ? any ? GPIO ? pin ? for ? use ? in ? other ? locations. ? On ? the ? Quick ? Start ? board, ? the ? clock ? signal ? is ? output ? on ?
GPIO_0 ? and ? is ? the ? net ? is ? labeled ? GPIO_0(CLK0). ? The ? clock ? signal ? is ? sent ? to ? the ? Audio ? Codec ? as ? the ? clock ?
source ? for ? the ? audio ? sub ‐ system, ? and ? it ? is ? also ? sent ? to ? the ? expansion ? port ? as ? an ? available ? clock ? signal ? for ?
a ? custom ? designed ? card ? as ? needed. ?
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The ? 32.768KHz ? crystal ? (QZ1) ? is ? the ? clock ? source ? used ? by ? the ? i.MX53 ? Processor ? for ? the ? Secure ? Real ? Time ?
Clock ? module. ? It ? receives ? power ? from ? the ? NVCC_SRTC ? pin ? which ? is ? connected ? to ? the ? VLDO1 ? 1.3V ? voltage ?
regulator. ? The ? 32.768KHz ? clock ? signal ? is ? not ? sent ? anywhere ? else ? on ? the ? Quick ? Start ? board. ? The ? location ? of ?
the ? crystal ? is ? also ? shown ? in ? Figure ? 18 . ?
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?? X1 ?
Y1
QZ1
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Figure ? 18. ? Clock ? Source ? Locations ?
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The ? clock ? source ? for ? the ? Ethernet ? PHY ? is ? a ? 50 ? MHz ? Oscillator ? (X1) ? with ? an ? enable ? pin ? and ? is ? shown ? in ?
Figure ? 18 . ? The ? oscillator ? was ? originally ? placed ? to ? support ? both ? the ? SATA ? module ? and ? the ? Ethernet ? PHY. ? It ?
is ? no ? longer ? used ? for ? the ? SATA ? module, ? and ? only ? supplies ? a ? clock ? signal ? to ? the ? Ethernet ? PHY. ? It ? is ?
powered ? by ? the ? DCDC_3V2 ? power ? rail ? and, ? by ? default, ? is ? always ? on ? when ? the ? DCDC_3V2 ? rail ? is ? powered ?
on. ? It ? is ? possible ? for ? the ? developer ? to ? remove ? resistor ? R110 ? and ? place ? a ? zero ? Ohm ? resistor ? across ? R197 ? to ?
give ? the ? developer ? software ? control ? of ? the ? oscillator ? through ? pin ? GPIO_4 ? (D4). ?
Freescale Semiconductor
Hardware User Guide for i.MX53 Quick Start Board,
Preliminary Rev 0.91
48
PUBI – Public Use Business Information ?
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