TMS320DM6437_17 Datasheet, PDF (296/306 Pages) Texas Instruments – Digital Media Processor

TMS320DM6437
Digital Media Processor
SPRS345D – NOVEMBER 2006 – REVISED JUNE 2008
6.23.2 GPIO Peripheral Input/Output Electrical Data/Timing
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Table 6-112. Timing Requirements for GPIO Inputs⁽¹⁾ (see Figure 6-55)
-7/-6/-5/-4
NO.
-L/-Q6/-Q5/-Q4 _UNIT
MIN MAX
1
t_w(GPIH)
2
t_w(GPIL)
Pulse duration, GP[x] input high
Pulse duration, GP[x] input low
2C ⁽²⁾
ns
2C ⁽²⁾
ns
(1) The pulse width given is sufficient to generate a CPU interrupt or an EDMA event. However, if a user wants to have DM6437 recognize
the GP[x] input changes through software polling of the GPIO register, the GP[x] input duration must be extended to allow DM6437
enough time to access the GPIO register through the internal bus.
(2) C = SYSCLK3 period in ns. For example, when running parts at 600 MHz, use C = 10 ns.
Table 6-113. Switching Characteristics Over Recommended Operating Conditions for GPIO Outputs
(see Figure 6-55)
NO.
PARAMETER
-7/-6/-5/-4
-L/-Q6/-Q5/-Q4
UNIT
MIN MAX
3
t_w(GPOH)
4
t_w(GPOL)
Pulse duration, GP[x] output high
Pulse duration, GP[x] output low
2C ^{(1) (2)}
ns
2C ^{(1) (2)}
ns
(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 600 MHz, use C = 10 ns.
GP[x]
Input
GP[x]
Output
2
1
4
3
Figure 6-55. GPIO Port Timing
296 Peripheral Information and Electrical Specifications
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