Texas-instruments TMS320C64x DSP Manual de usuario descargar pdf (Pagina 138)

Video Capture Registers

Video Capture Port3-76 SPRU629

3.13.14 TSI System Time Clock LSB Register (TSISTCLKL)

The transport stream interface system time clock LSB register (TSISTCLKL)

contains the 32 least-significant bits (LSBs) of the program clock reference

(PCR). The system time clock value is obtained by reading TSISTCLKL and

TSISTCLKM. TSISTCLKL is shown in Figure 3–42 and described in

Table 3–27.

TSISTCLKL represents the current value of the 32 LSBs of the base PCR that

normally counts at a 90-kHz rate. Since the system time clock counter contin-

ues to count, the DSP may need to read TSISTCLKL twice in a row to ensure

an accurate value.

Figure 3–42. TSI System Time Clock LSB Register (TSISTCLKL)

31 0

PCR

R/W-0

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

Table 3–27. TSI System Time Clock LSB Register (TSISTCLKL) Field Descriptions

Description

Bit Field symval

†

Value

BT.656, Y/C Mode,

or Raw Data Mode

TSI Mode

31–0 PCR OF(value) 0–FFFF FFFFh Not used. Contains the 32 LSBs of the

program clock reference.

†

For CSL implementation, use the notation VP_TSISTCLKL_PCR_symval

1 2 ... 133 134 135 136 137 138 139 140 141 142 143 ... 305 306

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Texas-instruments TMS320C64x DSP Manual de usuario Pagina 138