5.0 Serial Programming Interface and Registers
5.4 Register Detail
Bt860/861
Multiport YCrCb to NTSC/PAL /SECAM
Register 1A
Default
Value
Register
1A
D7
D6
D5
D4
D3
D2
D1
D0
80
BLENDMODE
ALPHAMODE[1:0]
OVRLAY_SEL VIDEO_SEL
EN_656
PROG_SC SC_PATTERN
BLENDMODE
Blend Select
0 = Alpha control contained in Y[1:0] of port selected by OVRLAY_SEL.
1 = Alpha control contained in ALPHA[1:0] pins as described by ALPHAMODE [1:0] bits.
See Table 2-1.
ALPHAMODE[1:0]
Alpha Select (effective only when BLENDMODE = 1)
00 = Disable Alpha blending.
01 = Use ALPHA[0] as 1-bit alpha blend value with look-up table value.
10 = Use ALPHA[1:0] as 2-bit alpha blend value with look-up table value.
11 = Use ALPHA[1:0] over two load clocks to form a 4-bit alpha blend value.
See Table 2-1 and Figure 2-2.
OVRLAY_SEL
VIDEO_SEL
EN_656
Overlay Select
0 = Select P[7:0] as overlay blend stream.
1 = Select OSD[7:0] as overlay blend stream.
See Table 2-1.
Video Select
0 = Select P[7:0] as video blend stream.
1 = Select VID[7:0] as video blend stream.
See Table 2-1.
Enable 656 Code Translation
0 = Use HSYNC*, VSYNC*, and BLANK* for video timing information.
1 = Use embedded SAV/EAV codes as defined by ITU-R BT.656 specification from port
P[7:0] as timing source.
See Table 2-2.
PROG_SC
SECAM Subcarrier Control
0 = SECAM subcarrier is generated on lines 23–310 and 336–623.
1 = SECAM subcarrier is generated on the active lines defined by VBLANK and VACTIVE.
SC_PATTERN
SECAM Phase Sequence
0 = 0° 0° 180° 0° 0° 180° SECAM subcarrier phase sequence.
1 = 0° 0° 0° 180° 180° 180° SECAM subcarrier phase sequence.
5-22
Conexant
D860DSA
CONEXANT [ CONEXANT SYSTEMS, INC ]
