AD9992BBCZ datasheet(20/92 Pages) AD

20 / 92 page

AD9992

Rev. C | Page 20 of 92

CLPOB

PBLK

PROGRAMMABLE SETTINGS:

1START POLARITY (CLAMP AND BLANK REGION ARE ACTIVE LOW).

2FIRST TOGGLE POSITION.

3SECOND TOGGLE POSITION.

ACTIVE

Figure 22. Clamp and Preblank Pulse Placement

NO CLPOB SIGNAL

FOR LINE 600

NO CLPOB SIGNAL

FOR LINES 6 TO 8

CLPMASKSTART1 = 6

CLPMASKEND1 = 8

597 598

CLPMASKSTART2 = CLPMASKEND2 = 600

CLPOB

Figure 23. CLPOB Masking Example

Individual HBLK Patterns

The HBLK programmable timing shown in Figure 24 is similar

to CLPOB and PBLK; however, there is no start polarity control.

Only the toggle positions are used to designate the start and

stop positions of the blanking period. Additionally, there are

separate masking polarity controls for H1, H2, and HL that

designate the polarity of the horizontal clock signals during

the blanking period. Setting HBLKMASK_H1 high sets H1, and

therefore H3, H5, and H7, low during the blanking, as shown in

Figure 25. As with the CLPOB and PBLK signals, HBLK

registers are available in each V-sequence, allowing different

blanking signals to be used with different vertical timing

sequences.

The AD9992 supports three modes of HBLK operation. HBLK

Mode 0 supports basic operation and some support for special

HBLK patterns. HBLK Mode 1 supports pixel mixing HBLK

operation. HBLK Mode 2 supports advanced HBLK operation.

The following sections describe each mode in detail. Register

parameters are described in detail in Table 11.

HBLK Mode 0 Operation

There are six toggle positions available for HBLK. Normally,

only two of the toggle positions are used to generate the standard

HBLK interval. However, the additional toggle positions can be

used to generate special HBLK patterns, as shown in Figure 26.

The pattern in this example uses all six toggle positions to

generate two extra groups of pulses during the HBLK interval.

By changing the toggle positions, different patterns can be

created.

Separate toggle positions are available for even and odd lines. If

alternation is not needed, the same values should be loaded into

the registers for even (HBLKTOGE) and odd (HBLKTOGO) lines.

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