ClbObL
`jomiey>01]U0
`
`ofJOAJUOY8SIONMOTrOL
`
`
`
`
`
`L‘Sls8ZL
`
`jeysAig
`
`JO}E]IISO
`
`JOMOdMO]
`
`Oc}
`
`SOL
`
`901
`
`OOL
`
`
`
`
`
`
`

`

`Vdd
`
`200
`
`FIG. 2
`
`

`

`
`|vee
`
`yayngalxnagoeqgtedoe
`
`SIONMO7]
`
`Jou]
`
`jo1jU04y
`
`yup)
`
`je}sAug
`
`JOJE|LOSO
`
`
`
`€Sls8ZL
`
`
`
`JOYINGevgoeOBEOA
`
`de6Bpueg
`
`O0€
`
`201”\
`
`ccoBLE<<JoyWWIT
`
`
`
`JEModMOTBIUTIIIJII
`
`

`

`
`
`FIG. 4
`
`

`

`J8MOdqMO]
`
`JOU]
`
`OSIONMO7]
`
`JO}UIT
`
`cOL
`
`3SIONMO] 00S
`
`8|40}2]/19SO
`
`jo1JU0D
`
`JOMOdMO7]
`
`debpueg
`
`jo1jU05
`
`wun
`
`deBpueg
`
`

`

`600
`
`\
`
`602
`
`
`Low-power
`Low power mode/
`Low noise?
`
`604
`
`608
`
`Low-noise
`
`
`
`
`
`
`
`
`
`Switching a voltage
`Switching a voltage
`
`reference input to a low-
`reference input to a low-
`
`
`noise bandgapvoltage
`power bandgapvoltage
`
`reference
`reference
`
`
`
`
`
` Powering down the low-
`Powering downthe low-
`power bandgap voltage
`
`
`noise bandgapvoltage
`
`reference
`
`reference generator
`
`610
`
`
`
`
`Providing a constant
`
`voltage output using an
`
`LDOto a crystal
`oscillator
`
`614
`
`
`
`Generating a clock
`signal using the crystal
`oscillator
`
`
`
`FIG. 6
`
`

`

`700
`
`702
`
`
`
`Low-noise Low-power/ow-power/ low:
`
`noise mode?
`
`
`
`
`
`
`Selecting the low-
`
`poweroutput clock
`signal from the low-
`powerlimiter
`
`
`704
`
`708
`
`
`Selecting the low-
`noise output clock
`
`signal from the low-
`noise limiter
`
`706
`
`710
`
`
`
`
`Powering downthe
`Powering down the
`low-noise limiter
`low-powerlimiter
`
`
`
`
`
`FIG. 7
`
`

`

`800
`
`\ 802
`
`Low-power
`
`Low-power/
`ow-noise mode?
`
`
`
`Low-noise
`
`
`
`voltage reference
` Switching a voltage reference
`
`input to a low-power bandgap
`voltage reference
`
`
`
`804
`
`Switching a voltage reference
`input to a low-noise bandgap
`
`Powering down the low-
`noise bandgap voltage
`
`reference generator
`signal
`
`Providing a constant
`voltage output using a LDO
`to a crystal oscillator and
`generating an input clock
`
`
`
`
`
`Selecting the output clock
`signal from the low-power
`limiter
`
`808
`
`812
`
`816
`
`820
`
`
`
`
`Powering downthe low-
`powerbandgap voltage
`reference generator
`
`
`
`
`
`
`Providing a constant
`voltage output using a LDO
`
`to a crystal oscillator and
`generating an input clock
`signal
`
`
`
`
`
`
`
`Selecting the output clock
`signal from the low-noise
`limiter
`
`Powering downthe low-
`noise limiter
`
`Powering downthe low-
`powerlimiter
`
`FIG. 8
`
`806
`
`810
`
`814
`
`818
`
`822
`
`

`

`Computer System 900
`
`Processor 904
`
`Main Memory 905
`
`Removable
`Storage Unit 915
`
`Removable
`
`Interface 924 Communications Path 926
`
`Storage Unit 902
`
`Communication
`Infrastructure
`906
`
`Secondary Memory 910
`
`Hard Disk Drive
`912
`
`Removable Storage
`Drive 914
`
`Interface 920
`
`Communications
`
`FIG. 9
`
`

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