Video Output Filtering; Output Filter Modes; Output Filter Mode Selection; Display Operation - Texas Instruments TMS320C64x DSP Reference Manual

4.4 Video Output Filtering

The video output filter performs simple hardware scaling and resampling on
outgoing 8-bit BT.656 or 8-bit Y/C data. Filtering hardware is disabled during
10-bit or raw data display modes.
4.4.1

Output Filter Modes

The output filter has four modes of operation: no-filtering, 2 scaling, chromi-
nance resampling, and 2 scaling with chrominance resampling. Filter opera-
tion is determined by the DMODE, SCALE, and RESMPL bits of the VDCTL.
Table 4–3 shows the output filter mode selection. When 8-bit BT.656 or Y/C
display operation is selected, (DMODE = x00), scaling is selected by setting
the SCALE bit and chrominance resampling is selected by setting the
RESMPL bit. If 8-bit BT.656 or Y/C display is not selected (DMODE
filtering is disabled.
Table 4–3. Output Filter Mode Selection
VDCTL Bit
DMODE RESMPL SCALE
x00 0
x00 0
x00 1
x00 1
x01 x
x10 x
x11 x
SPRU629
Filter Operation
0 No filtering
1 2 scaling
0 Chrominance resampling (full scale)
1 2 scaling with chrominance resampling
x No filtering
x No filtering
x No filtering

Video Output Filtering

x00),
Video Display Port 4-21