Texas Instruments TMS320DM648 TCI System Time Clock Compare Mask LSB Register Tcistmskl, Atcm

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Video Capture Registers

Table 3-30. TCI System Time Clock Compare MSB Register (TCISTCMPM) Field Descriptions

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

(1)For CSL implementation, use the notation VP_TCISTCMPM_ATC_symval

3.13.18 TCI System Time Clock Compare Mask LSB Register (TCISTMSKL)

The transport stream interface system time clock compare mask LSB register (TCISTMSKL) holds the 32 least-significant bits (LSBs) of the absolute time compare mask (ATCM). This value is used with TCISTMSKM to mask out bits during the comparison of the ATC to the system time clock for absolute time. The bits that are set to one mask the corresponding ATC bits during the compare.

To prevent inaccurate comparisons caused by changing register bits, the software should disable the system time clock interrupt (clear the STEN bit in TCICTL) prior to writing to TCISTMSKL.

The TCI system time clock compare mask LSB register (TCISTMSKL) is shown in Figure 3-38and described in Table 3-31.

Figure 3-38. TCI System Time Clock Compare Mask LSB Register (TCISTMSKL)

31 0

ATCM

R/W-0

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

Table 3-31. TCI System Time Clock Compare Mask LSB Register (TCISTMSKL) Field Descriptions

				Description
Bit	field	symval (1)	Value	BT.656, Y/C Mode, or Raw Data Mode	TCI Mode
31-0	ATCM	OF(value)	0-FFFF FFFFh	Not used.	Contains the 32 LSBs of the absolute
					time compare mask.
		DEFAULT	0

(1)For CSL implementation, use the notation VP_TCISTMSKL_ATCM_symval

3.13.19 TCI System Time Clock Compare Mask MSB Register (TCISTMSKM)

The transport stream interface system time clock compare mask MSB register (TCISTMSKM) holds the most-significant bit (MSB) of the absolute time compare mask (ATCM). This value is used with TCISTMSKL to mask out bits during the comparison of the ATC to the system time clock for absolute time. The bits that are set to one mask the corresponding ATC bits during the compare. .

To prevent inaccurate comparisons caused by changing register bits, the software should disable the system time clock interrupt (clear the STEN bit in TCICTL) prior to writing to TCISTMSKM.

The TCI system time clock compare mask MSB register (TCISTMSKM) is shown in Figure 3-39and described in Table 3-32

SPRUEM1 –May 2007 Video Capture Port 89

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