TMS320DM642 datasheet(165/178 Pages) TI

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5.19.3

General-Purpose Input/Output (GPIO) Electrical Data/Timing

GPIx

GPOx

TMS320DM642

Video/Imaging Fixed-Point Digital Signal Processor

SPRS200J – JULY 2002 – REVISED AUGUST 2005

Table 5-87. Timing Requirements for GPIO Inputs

(1) (2) (see Figure 5-72)

–500

–600

NO.

UNIT

–720

MIN

MAX

tw(GPIH)

Pulse duration, GPIx high

tw(GPIL)

Pulse duration, GPIx low

(1)

P = 1/CPU clock frequency in ns. For example, when running parts at 720 MHz, use P = 1.39 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 5-88. Switching Characteristics Over Recommended Operating Conditions for GPIO Outputs

(1)

(see Figure 5-72)

–500

–600

NO.

PARAMETER

UNIT

–720

MIN

MAX

tw(GPOH)

Pulse duration, GPOx high

24P – 8(2)

tw(GPOL)

Pulse duration, GPOx low

24P – 8(2)

(1)

P = 1/CPU clock frequency in ns. For example, when running parts at 720 MHz, use P = 1.39 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 5-72. GPIO Port Timing

DM642 Peripheral Information and Electrical Specifications

165

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