Texas-instruments TMS320C6454 Manuel d'utilisateur télécharger pdf (Page 215)

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PRODUCT PREVIEW

7.17.3 GPIO Electrical Data/Timing

GPIx

GPOx

TMS320C6454

Fixed-Point Digital Signal Processor

SPRS311A – APRIL 2006 – REVISED DECEMBER 2006

Table 7-103. Timing Requirements for GPIO Inputs

(1) (2)

(see Figure 7-74 )

-720

-850

NO. UNIT

-1000

MIN MAX

1 t

w(GPIH)

Pulse duration, GPIx high 12P ns

2 t

w(GPIL)

Pulse duration, GPIx low 12P ns

(1) P = 1/CPU clock frequency in ns. For example, when running parts at 1000 MHz, use P = 1 ns.

(2) 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.

Table 7-104. Switching Characteristics Over Recommended Operating Conditions for GPIO Outputs

(1)

(see Figure 7-74 )

-720

-850

NO. PARAMETER UNIT

-1000

MIN MAX

3 t

w(GPOH)

Pulse duration, GPOx high 36P – 8

(2)

4 t

w(GPOL)

Pulse duration, GPOx low 36P – 8

(2)

(1) P = 1/CPU clock frequency in ns. For example, when running parts at 1000 MHz, use P = 1 ns.

(2) 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.

Figure 7-74. GPIO Port Timing

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