TMS320DM6431 datasheet(218/227 Pages) TI1

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6.20.2

GPIO Peripheral Input/Output Electrical Data/Timing

GP[x]

Input

GP[x]

Output

TMS320DM6431

Digital Media Processor

SPRS342C – NOVEMBER 2006 – REVISED JUNE 2008

www.ti.com

Table 6-84. Timing Requirements for GPIO Inputs(1) (see Figure 6-46)

-3/-3Q/-3S

NO.

UNIT

MIN

MAX

tw(GPIH)

Pulse duration, GP[x] input high

2C(2)

tw(GPIL)

Pulse duration, GP[x] input low

2C(2)

(1)

The pulse width given is sufficient to generate a CPU interrupt or an EDMA event. However, if a user wants to have DM6431 recognize

the GP[x] input changes through software polling of the GPIO register, the GP[x] input duration must be extended to allow DM6431

enough time to access the GPIO register through the internal bus.

(2)

C = SYSCLK3 period in ns. For example, when running parts at 300 MHz, use C = 20 ns.

Table 6-85. Switching Characteristics Over Recommended Operating Conditions for GPIO Outputs

(see Figure 6-46)

-3/-3Q/-3S

NO.

PARAMETER

UNIT

MIN

MAX

tw(GPOH)

Pulse duration, GP[x] output high

2C(1)(2)

tw(GPOL)

Pulse duration, GP[x] output low

2C(1)(2)

(1)

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.

(2)

C = SYSCLK3 period in ns. For example, when running parts at 300 MHz, use C = 20 ns.

Figure 6-46. GPIO Port Timing

218

Peripheral Information and Electrical Specifications

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TMS320DM6431 Datasheet(PDF) 218 Page - Texas Instruments

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