Bt860/861
3.0 Digital Processing and Functionality
3.2 Effects
Multiport YCrCb to NTSC/PAL /SECAM
Table 3-8. Composite and Chrominance Magnitude
C and
Composite
M
M
M
M
M
M
M
M
M
blk
b
wht
yel
cyn
grn
mgt
red
blu
Magnitudes
NTSC-M (volts)
NTSC-J (volts)
PAL-B (volts)
0.286
0.286
0.300
0
0
0
0.444
0.480
0.470
0.630
0.681
0.663
0.589
0.636
0.620
0.589
0.636
0.620
0.629
0.681
0.664
0.444
0.480
0.470
0
0
0
M numbers are the peak-to-peak amplitudes of the subcarrier waveform.
x
3.2.4 Setup
Setting the SETUP register bit to 1 places a 0.054 V (7.5 IRE) pedestal between
blank and black. SETUP only affects Composite, Y of S-Video, Y of YUV, and
RGB waveforms.
3.2.5 YUV and RGB Multipliers
When the output format of DACs D, E, and F is YUV or RGB, registers
M_COMP_D (23[7:0]), M_COMP_E (25[7:0]) and M_COMP_F (24[7:0]) are
amplitude multipliers. The gain range is from 0x to 2x, where a register value of
0x80 gives a gain of 1.
3.2.6 Programming Values to Comply with YPrPb and RGB
To comply with EIA 770.1 on 525-line systems for YPrPb values (listed in
Table 3-5), start with the programming values listed in Table 3-2, then use these
multipliers:
Value
(NTSC-J)
0x80
Value
(NTSC-M)
0x80
Register
0x23
0x24
0x90
0x90
0x25
0x66
0x66
To attain the RGB values shown in Table 3-6, start with the programming values
listed in Table 3-2, then use these multipliers:
Value
Register
0x23
0x24
(PAL-B, D, G, H, I)
0x80
0x80
0x80
0x25
D860DSA
Conexant
3-19
CONEXANT [ CONEXANT SYSTEMS, INC ]
