CS7654 Просмотр технического описания (PDF) - Cirrus Logic
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CS7654 Datasheet PDF : 62 Pages
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CS7654
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Burst begins with positive half-cycle
Burst phase = reference phase = 180 0relative to B-Y
Burst begins with negative half-cycle
Burst phase = reference phase = 1800relative to B-Y
Figure 7. NTSC Video Non-Interlaced Progressive Scan Timing
In mode 1 the CS7654 displays the image captured
by the camera.
Multi-standard Output Format Modes
The CS7654 supports a wide range of analog out-
put formats compatible with worldwide broadcast
standards. These formats include NTSC-M, NTSC-
J, PAL-B/D/G/H/I, PAL-M, PAL-N, and PAL
Combination N (PAL-Nc) which is the broadcast
standard used in Argentina. After RESET, the
CS7654 defaults to NTSC-M operation with ITU
R.BT 601 analog timing. NTSC-J can also be sup-
ported in the Japanese format by turning off the 7.5
IRE pedestal through the PED bit in the
CONTROL_1 Register (0x01) at SA 0x00.
Output formats are configured by writing control
registers with the values shown in Table 5.
(SC_SYNTH0/1/2/3). The NTSC subcarrier syn-
thesizer is reset every four fields (every eight fields
for PAL).
The SC_SYNTH0/1/2/3 registers used together
provide a 32-bit value that defaults to NTSC
(43E0F83Eh) following RESET. Table 4 shows the
32-bit value required for each of the different
broadcast formats.
Color Bar Generator
The CS7654 is equipped with a color bar generator
that is enabled through the CBAR bit of the
CONTROL_1 Register lodated at SA 0x00. The
color bar generator works in master Mode only and
has no effect on the video input/output timing. The
color bar generator will override the video input
pixel data.
Subcarrier Generation
The CS7654 automatically synthesizes NTSC and
PAL color subcarrier clocks using the CLK fre-
quency and four control registers
The output of the color bar generator is instantiated
after the chroma interpolation filter and before the
luma delay line. The generated color bar numbers
are for 100% amplitude, 100% saturation NTSC
EIA color bars or 100% amplitude, 100% satura-
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