TMS320C6454

Fixed-Point Digital Signal Processor

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SPRS311A –APRIL 2006 –REVISED DECEMBER 2006

7.17.3 GPIO Electrical Data/Timing

Table 7-103. Timing Requirements for GPIO Inputs(1) (2) (see Figure 7-74)

 

 

 

-720

 

NO.

 

 

-850

UNIT

 

 

-1000

 

 

 

 

 

 

 

MIN

MAX

1

tw(GPIH)

Pulse duration, GPIx high

12P

ns

2

tw(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

 

NO.

 

 

PARAMETER

-850

UNIT

 

 

-1000

 

 

 

 

 

 

 

 

 

MIN

MAX

3

t

w(GPOH)

Pulse duration, GPOx high

36P – 8(2)

ns

4

t

w(GPOL)

Pulse duration, GPOx low

36P – 8(2)

ns

 

 

 

 

 

(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.

 

2

 

1

GPIx

4

 

3

GPOx

Figure 7-74. GPIO Port Timing

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Texas Instruments TMS320C6454 Gpio Electrical Data/Timing, Timing Requirements for Gpio Inputs1 2 see Figure, GPIx GPOx