Texas Instruments TMS320DM648 TCI System Time Clock Ticks Interrupt Register Tciticks, Tickct

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Video Capture Registers

Figure 3-39. TCI System Time Clock Compare Mask MSB Register (TCISTMSKM)

31		16
Reserved
R-0
15	1	0
Reserved		ATCM
R-0		R/W-0

LEGEND: R/W = Read/Write; R = Read only; -n= value after reset

Table 3-32. TCI System Time Clock Compare Mask MSB Register (TCISTMSKM) Field Descriptions

				Description
Bit	field	symval (1)	Value	BT.656, Y/C Mode, or Raw Data Mode	TCI M ode
31-1	Reserved	-	0	Reserved. The reserved bit location is always read as 0. A value written to this field
				has no effect.
0	ATCM	OF(value)	0-1	Not used.	Contains the MSB of the absolute time
					compare mask.
		DEFAULT	0

(1)For CSL implementation, use the notation VP_TCISTMSKM_ATCM_symval

3.13.20 TCI System Time Clock Ticks Interrupt Register (TCITICKS)

The transport stream interface system time clock ticks interrupt register (TCITICKS) is used to generate an interrupt after a certain number of ticks of the 27-MHz system time clock. When the TICKCT value is set to X and the TCKEN bit in TCICTL is set, the TICK bit in VPIS is set every X + 1 STCLK cycles. Note that the tick interrupt counter and comparison logic function are separate from the PCR logic and always count STCLK cycles regardless of the value of the CTMODE bit in TCICTL.

A write to TCITICKS resets the tick counter 0. Whenever the tick counter reaches the TICKCT value, the TICK bit in VPIS is set and the counter resets to 0.

To prevent inaccurate comparisons caused by changing register bits, the software should disable the tick count interrupt (clear the TCKEN bit in TCICTL) prior to writing to TCITICKS.

The TCI system time clock ticks interrupt register (TCITICKS) is shown in Figure 3-40and described in Table 3-33.

Figure 3-40. TCI System Time Clock Ticks Interrupt Register (TCITICKS)

31 0

TICKCT

R/W-0

LEGEND: R/W = Read/Write; -n= value after reset

Table 3-33. TCI System Time Clock Ticks Interrupt Register (TCITICKS) Field Descriptions

					Description
		symval (1)		BT.656, Y/C Mode, or Raw Data	TCI Mode
Bit	field		Value	Mode
31-0	TICKCT	OF(value)	0-FFFF FFFFh	Not used.	Contains the number of ticks of the
					27-MHz system time clock required to
					generate a tick count interrupt.
		DEFAULT	0

(1)For CSL implementation, use the notation VP_TCITICKS_TICKCT_symval

90 Video Capture Port SPRUEM1 –May 2007

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