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TMS320DM641 Datasheet(PDF) 153 Page - Texas Instruments |
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TMS320DM641 Datasheet(HTML) 153 Page - Texas Instruments |
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153 / 171 page  VCXO Interpolated Control (VIC) 153 June 2003 − Revised August 2004 SPRS222C 4.14 VCXO Interpolated Control (VIC) The VIC can be used in conjunction with the Video Ports (VPs) to maintain synchronization of a video stream. The VIC can also be used to control a VCXO to adjust the pixel clock rate to a video port. 4.14.1 VIC Device-Specific Information The VCXO interpolated control (VIC) port provides digital-to-analog conversation with resolution from 9-bits to up to 16-bits. The output of the VIC is a single bit interpolated D/A output (VDAC pin). Typical D/A converters provide a discrete output level for every value of the digital word that is being converted. This is a problem for digital words that are long. This is avoided in a Sigma Delta type D/A converter by choosing a few widely spaced output levels and interpolating values between them. The interpolating mechanism causes the output to oscillate rapidly between the levels in such a manner that the average output represents the value of input code. In the VIC, two output levels are chosen (0 and 1), and Sigma Delta interpolation scheme is implemented to interpolate between these levels with a rapidly changing signal. The frequency of interpolation is dependent on the resolution needed. When the video port is used in transport stream interface (TSI) mode [currently not supported], the VIC port is used to control the system clock, VCXO, for MPEG transport stream. The VIC supports the following features: • Single interpolation for D/A conversion • Programmable precision from 9-to-16 bits • Interface for register accesses For more detailed information on the DM641 and DM640 VCXO interpolated control (VIC) peripheral, see the TMS320C64x DSP Video Port/VCXO Interpolated Control (VIC) Port Reference Guide (literature number SPRU629). 4.14.2 VIC Peripheral Register Description(s) Table 4−61. VCXO Interpolated Control (VIC) Port Registers HEX ADDRESS RANGE ACRONYM REGISTER NAME 01C4 C000 VICCTL VIC control register 01C4 C004 VICIN VIC input register 01C4 C008 VPDIV VIC clock divider register 01C4 C00C − 01C4 FFFF − Reserved |
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