CS7654 datasheet(20/62 Pages) CIRRUS

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CS7654

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

the

CONTROL_1 Register (0x01) at SA 0x00.

Output formats are configured by writing control

registers with the values shown in Table 5.

Subcarrier Generation

The CS7654 automatically synthesizes NTSC and

PAL color subcarrier clocks using the CLK fre-

quency

and

four

control

registers

(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.

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-

261

262

Start of

VSYNC

Field 1

Burst begins with positive half-cycle

Burst begins with negative half-cycle

Burst phase = reference phase = 180 relative to B-Y

262

263

261

262

263

Field 2

Field 3

Field 4

Start of

VSYNC

Figure 7. NTSC Video Non-Interlaced Progressive Scan Timing

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