ML6461CS datasheet(13/30 Pages) MICRO-LINEAR

13 / 30 page

ML6461

Internal Slave Mode

Embedded in the YCrCb data stream, the timing code

0xFF, 0x00, 0x00, 0x(SAV) must be inserted before the

samples of the first active pixel. Figures 6 through 6b

illustrate timing for CCIR656 video with SAV and EAV

codes for CCIR or Square Pixel clocking.

External Slave Mode

A horizontal reset pulse can be used either at the beginning

of active video or the beginning of horizontal blanking to

provide synchronization of the YCrCb data to the internal

clock. Bits SEL_HSYNC1(B14) and SEL_HSYNC0 (B13) are

provided to achieve some degree of programmability in this

synchronization. Figures 7 and 7a show synchronization for

active edge at the beginning of active video for positive or

negative HSYNC polarity while Figures 8 and 8a show

synchronization for active edge at the beginning of

horizontal blanking for positive or negative HSYNC polarity.

Polarity of HSYNC and VSYNC

In both the Master and Slave modes, the HSYNC and

VSYNC polarity can be selected via bit SENSE_HSYNC and

SENSE_VSYNC. When the SENSE_HSYNC bit is set to

logical 1, the HSYNC pulse is on the rising edge. When the

SENSE_HSYNC bit is cleared to logical 0, the HSYNC pulse

is on the falling edge. Similarly, when the SENSE_VSYNC bit

is set logical 1, the VSYNC pulse is on the rising edge.

Figure 6. CCIR Format: CLK = 27MHz

FUNCTIONAL DESCRIPTION (Continued)

When the SENSE_VSYNC bit is cleared to logical 0, the

VSYNC pulse is on the falling edge.

HSYNC Timing Delay

In both Master and Slave modes, the SEL_HSYNC1(B14)

and SEL_HSYNC0 (B13) bits of the control register can be

programmed to delay the HSYNC active edge up to three

clock periods, 3T, where T is one period of the clock.

CHROMA AND LUMA PROCESSING

Refer to Figures 9 through 12.

VIDEO OUTPUT STAGE

Reconstruction filtering, clamping, and line drivers

The ML6461 can simultaneously provide outputs for S-

video, two composite video, and a TV modulator.

Differential gain and phase are guaranteed at the outputs

of the line drivers. Two internal 7th-order Butterworth

filters and a group delay equalizer are used as

reconstruction filters on S-video (NTSC). The composite

signal is generated after reconstruction. The S-video (Y and

C) and composite video (CV) are then fed into 75

Ω line

drivers.

Each of the filter/drivers are designed to guarantee a

differential phase of 0.5º and differential gain of 0.5%.

CB0

CR0

CB1

CR1

CB2 Y4

Y C

Y715 CB358 Y716 CR358 Y717 CB359 Y718 CR359 Y719

01 2 3 45 67

270

272

274

276

278

280

282

1711

1713

1715

1440

268

• • • • • • •

In CCIR format, there are

{}intheactiveportionofaline.

720 Y

360 Cb

360 Cr

ACTIVE

BLANKING

ACTIVE

LINE

ML6461CS 数据表(PDF) 13 Page - Micro Linear Corporation

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