2.0 Inputs and Timing
Bt860/861
2.3 Configurations and Timing
Multiport YCrCb to NTSC/PAL /SECAM
2.3 Configurations and Timing
The Bt860/861 is capable of various ITU-R BT.601, ITU-R BT.656, and
decoder-locked configurations. Table 2-2 lists several ITU-R BT.601 and
ITU-R BT.656 configurations, and Section 2.3.3 discusses decoder-locked
configurations. In any of these configurations, it is possible to synchronize a
primary video source with an alternate video source. These two sources can then
be alpha-mixed, or independently selected for external display. Alpha mixing is
discussed in detail in Section 2.2.5.
Table 2-2. Configurable Timing States
Timing
Description
SLAVE
EN_656
SYNC_CFG
Mode
Bt860/861 is timing master,
(1)
1
0
0
1
HSYNC*, VSYNC*, and FIELD ,
are outputs.
Bt860/861 is timing slave, timing
derived from HSYNC*, VSYNC*,
2
3
1
1
0
1
X
0
and BLANK* signals(2)
.
Bt860/861 is timing slave, timing
derived from ITU-R BT.656 codes.
HSYNC*, and VSYNC* are
unused.
Bt860/861 is timing slave, timing
derived from ITU-R BT.656 codes.
4
1
1
1
(1)
HSYNC*, VSYNC*, and FIELD
are outputs.
NOTE(S):
(1)
Decoder locking using the VID port requires the part to be in timing mode 1, except
SYNC_CFG = 1 is only required if synchronization with other sources is required.
Either the BLANK* pin or the HBLANK, VBLANK, HACTIVE, and VACTIVE register can be
used for blanking.
(2)
3. Configurations not listed are not recommended.
4. X = Don’t care.
2-6
Conexant
D860DSA
CONEXANT [ CONEXANT SYSTEMS, INC ]
