TMS320C6411 Datasheet, PDF (114/119 Pages) Texas Instruments – FIXED POINT DIGITAL SIGNAL PROCESSOR

TMS320C6411
FIXEDĆPOINT DIGITAL SIGNAL PROCESSOR
SPRS196H − MARCH 2002 − REVISED JULY 2004
GENERAL-PURPOSE INPUT/OUTPUT (GPIO) PORT TIMING
timing requirements for GPIO inputs^†‡ (see Figure 58)
−300
NO.
UNIT
MIN MAX
1 tw(GPIH)
Pulse duration, GPIx high
8P
ns
2 tw(GPIL)
Pulse duration, GPIx low
8P
ns
† _{P = 1/CPU clock frequency in ns. For example, when running parts at 300 MHz, use P = 3.33 ns.}
‡ _{The pulse width given is sufficient to generate a CPU interrupt or an EDMA event. However, if a user wants to have the DSP recognize the GPIx}
changes through software polling of the GPIO register, the GPIx duration must be extended to at least 12P to allow the DSP enough time to access
the GPIO register through the CFGBUS.
switching characteristics over recommended operating conditions for GPIO outputs^†
(see Figure 58)
NO.
PARAMETER
−300
UNIT
MIN MAX
3 tw(GPOH) Pulse duration, GPOx high
4 tw(GPOL) Pulse duration, GPOx low
24P − 8‡
ns
24P − 8‡
ns
† _{P = 1/CPU clock frequency in ns. For example, when running parts at 300 MHz, use P = 3.33 ns.}
‡ _{This parameter value should not be used as a maximum performance specification. Actual performance of back-to-back accesses of the GPIO}
is dependent upon internal bus activity.
GPIx
GPOx
2
1
4
3
Figure 58. GPIO Port Timing
114
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