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7.17.3GPIOElectricalData/Timing
GPIx
GPOx
4
3
2
1
TMS320C6454
Fixed-PointDigitalSignalProcessor
SPRS311A–APRIL2006–REVISEDDECEMBER2006
Table7-103.TimingRequirementsforGPIOInputs
(1)(2)
(seeFigure7-74)
-720
-850
NO.UNIT
-1000
MINMAX
1t
w(GPIH)
Pulseduration,GPIxhigh12Pns
2t
w(GPIL)
Pulseduration,GPIxlow12Pns
(1)P=1/CPUclockfrequencyinns.Forexample,whenrunningpartsat1000MHz,useP=1ns.
(2)ThepulsewidthgivenissufficienttogenerateaCPUinterruptoranEDMAevent.However,ifauserwantstohavetheDSPrecognize
theGPIxchangesthroughsoftwarepollingoftheGPIOregister,theGPIxdurationmustbeextendedtoatleast12PtoallowtheDSP
enoughtimetoaccesstheGPIOregisterthroughtheCFGBUS.
Table7-104.SwitchingCharacteristicsOverRecommendedOperatingConditionsforGPIOOutputs
(1)
(seeFigure7-74)
-720
-850
NO.PARAMETERUNIT
-1000
MINMAX
3t
w(GPOH)
Pulseduration,GPOxhigh36P–8
(2)
ns
4t
w(GPOL)
Pulseduration,GPOxlow36P–8
(2)
ns
(1)P=1/CPUclockfrequencyinns.Forexample,whenrunningpartsat1000MHz,useP=1ns.
(2)Thisparametervalueshouldnotbeusedasamaximumperformancespecification.Actualperformanceofback-to-backaccessesofthe
GPIOisdependentuponinternalbusactivity.
Figure7-74.GPIOPortTiming
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