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5.18.3

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

GPIx

GPOx

TMS320DM643

Video/Imaging Fixed-Point Digital Signal Processor

SPRS269C – FEBRUARY 2005 – REVISED JANUARY 2007

Table 5-77. Timing Requirements for GPIO Inputs

(1) (2) (see Figure 5-68)

–500

–600

NO.

UNIT

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 600 MHz, use P = 1.67 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 5-78. Switching Characteristics Over Recommended Operating Conditions for GPIO Outputs

(1)

(see Figure 5-68)

–500

–600

NO.

PARAMETER

UNIT

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 600 MHz, use P = 1.67 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 5-68. GPIO Port Timing

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