TMS320DM647_0804 datasheet(175/182 Pages) TI

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6.23.2 GPIO Peripheral Input/Output Electrical Data/Timing

GPIx

GPOx

6.24 Emulation Features and Capability

6.24.1 Advanced Event Triggering (AET)

TMS320DM647/TMS320DM648

Digital Media Processor

www.ti.com

SPRS372B – MAY 2007 – REVISED APRIL 2008

Table 6-95. Timing Requirements for GPIO Inputs(1) (see Figure 6-56)

-720

-900

NO.

UNIT

MIN

MAX

tw(GPIH)

Pulse duration, GPIx high

12P

tw(GPIL)

Pulse duration, GPIx low

12P

(1)

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

recognize the GPIx changes through software polling of the GPIO register, the GPIx duration must be extended to allow the device

enough time to access the GPIO register through the internal bus. P = 1/CPU clock frequency in ns.

Table 6-96. Switching Characteristics Over Recommended Operating Conditions for GPIO Outputs

(see Figure 6-56)

-720

-900

NO.

PARAMETER

UNIT

MIN

MAX

tw(GPOH)

Pulse duration, GPOx high

6P(1)

tw(GPOL)

Pulse duration, GPOx low

6P(1)

(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. P = 1/CPU clock frequency in ns.

Figure 6-56. GPIO Port Timing

The DM647/DM648 device supports Advanced Event Triggering (AET). This capability can be used to

debug complex problems as well as understand performance characteristics of user applications. AET

provides the following capabilities:

• Hardware Program Breakpoints: specify addresses or address ranges that can generate events such

as halting the processor or triggering the trace capture.

• Data Watchpoints: specify data variable addresses, address ranges, or data values that can generate

events such as halting the processor or triggering the trace capture.

• Counters: count the occurrence of an event or cycles for performance monitoring.

• State Sequencing: allows combinations of hardware program breakpoints and data watchpoints to

precisely generate events for complex sequences.

For more information on AET, see the following documents:

• Using Advanced Event Triggering to Find and Fix Intermittent Real-Time Bugs Application Report

(literature number SPRA753)

• Using Advanced Event Triggering to Debug Real-Time Problems in High Speed Embedded

Microprocessor Systems Application Report (literature number SPRA387)

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