Texas Instruments TMS320DM355 warranty Timer Electrical Data/Timing

PRODUCT PREVIEW

TMS320DM355

Digital Media System-on-Chip (DMSoC)

www.ti.com

SPRS463A –SEPTEMBER 2007 –REVISED SEPTEMBER 2007

5.15 Timer

The contains four software-programmable timers. Timer 0, Timer 1, and Timer 3 (general-purpose timers) can be programmed in 64-bit mode, dual 32-bit unchained mode, or dual 32-bit chained mode. Timer 3 supports additional features over the other timers: external clock/event input, period reload, output event tied to Real Time Out (RTO) module, external event capture, and timer counter register read reset. Timer 2 is used only as a watchdog timer. Timer 2 is tied to device reset.

∙64-bit count-up counter

∙Timer modes:

–64-bit general-purpose timer mode (Timer 0, 1, 3)

–Dual 32-bit general-purpose timer mode (Timer 0, 1, 3)

–Watchdog timer mode (Timer 2)

∙Two possible clock sources:

–Internal clock

–External clock/event input via timer input pins (Timer 3)

∙Three possible operation modes:

–One-time operation (timer runs for one period then stops)

–Continuous operation (timer automatically resets after each period)

–Continuous operation with period reload (Timer 3)

∙Generates interrupts to the ARM CPU

∙Generates sync event to EDMA

∙Generates output event to device reset (Timer 2)

∙Generates output event to Real Timer Out (RTO) module (Timer 3)

∙External event capture via timer input pins (Timer 3)

For more detailed information, see the TMS320DM355 DMSoC 64-bit Timer User'sGuide for more information (SPRUEE5).

5.15.1Timer Electrical Data/Timing

Table 5-45. Timing Requirements for Timer Input(1) (2) (3) (see Figure 5-46)

NO.			DM355		UNIT
			MIN	MAX
1	tc(TIN)	Cycle time, TIM_IN	4P		ns
2	tw(TINPH)	Pulse duration, TIM_IN high	0.45C	0.55C	ns
3	tw(TINPL)	Pulse duration, TIM_IN low	0.45C	0.55C	ns
4	tt(TIN)	Transition time, TIM_IN		0.05C	ns

(1)GPIO000, GPIO001, GPIO002, and GPIO003 can be used as external clock inputs for Timer 3. See the TMS320DM355 DMSoC 64-bit Timer User'sGuide for more information (SPRUEE5).

(2)P = MXI1/CLKIN cycle time in ns. For example, when MXI1/CLKIN frequency is 24 MHz use P = 41.6 ns.

(3)C = TIM_IN cycle time in ns. For example, when TIM_IN frequency is 24 MHz use C = 41.6 ns

1

2

3

4 4

TIM_IN

Figure 5-46. Timer Input Timing

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