ml6461 Micro Electronics Corporation, ml6461 Datasheet - Page 10

• Manufacturer Part Number: ml6461
• Description: Ntsc Video Encoder
• Manufacturer: Micro Electronics Corporation

ML6461
FUNCTIONAL DESCRIPTION
PIXEL SYNCHRONIZATION
Master Mode
In this mode, the active edge of horizontal sync pulse
through the HSYNC pin (configured as an output)
indicates the beginning of an active video line (or the
beginning of the horizontal blanking) and the multiplexed
YCrCb pixel data must be synchronized to this edge for
10
FIELD (1,2 and 3,4)
FIELD (ODD/EVEN)
H
L
H
L
Figure 3. Coincident Valid Sync Intervals for External Slave Mode
ODD
HSYNC
VSYNC
ANALOG FIELDS 1 & 2
HSYNC
VSYNC
Figure 2a. FIELD Pin Output Summary
(Continued)
for HRESET_MODE=1
coincident interval
64 pixels
EVEN
–32 pixels
for HRESET_MODE=0
active edge of VSYNC
coincident interval
active edge of VSYNC
proper video location, as well as the proper
demultiplexing of YCrCb values. This synchronization, as
shown in Figures 4 through 5a, is controlled by
SEL_HSYNC1 (B14) and SEL_HSYNC0 (B13). Figures 4
and 4a show synchronization for active edge at the
beginning of active video for positive or negative HSYNC
polarity while Figures 5 and 5a show synchronization for
active edge at the beginning of horizontal blanking for
positive or negative HSYNC polarity.
active edge of HSYNC
active edge of HSYNC
64 pixels
ODD
ANALOG FIELDS 3 & 4
EVEN
ANALOG FIELDS 1 & 2
ODD
EVEN