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AD9949

Rev. B | Page 21 of 36

HORIZONTAL CLAMPING AND BLANKING

The AD9949’s horizontal clamping and blanking pulses are fully

programmable to suit a variety of applications. Individual

sequences are defined for each signal, which are then organized

into multiple regions during image readout. This allows the

dark pixel clamping and blanking patterns to be changed at

each stage of the readout to accommodate different image

transfer timing and high speed line shifts.

INDIVIDUAL CLPOB AND PBLK SEQUENCES

The AFE horizontal timing consists of CLPOB and PBLK, as

shown in Figure 21. These two signals are independently

programmed using the parameters shown in Table 18. The start

polarity, first toggle position, and second toggle position are

fully programmable for each signal. The CLPOB and PBLK

signals are active low and should be programmed accordingly.

Up to four individual sequences can be created for each signal.

INDIVIDUAL HBLK SEQUENCES

The HBLK programmable timing shown in Figure 22 is similar

to CLPOB and PBLK. However, there is no start polarity

control. Only the toggle positions are used to designate the

start and the stop positions of the blanking period. Additionally,

there is a polarity control, HBLKMASK, which designates the

polarity of the horizontal clock signals H1 to H4 during the

blanking period. Setting HBLKMASK high sets H1 = H3 = low

and H2 = H4 = high during the blanking, as shown in Figure 23.

Up to four individual sequences are available for HBLK.

CLPOB

PBLK

PROGRAMMABLE SETTINGS:

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

2. FIRST TOGGLE POSITION.

3. SECOND TOGGLE POSITION.

ACTIVE

...

Figure 21. Clamp and Preblank Pulse Placement

HBLK

PROGRAMMABLE SETTINGS:

1. FIRST TOGGLE POSITION = START OF BLANKING.

2. SECOND TOGGLE POSITION = END OF BLANKING.

BLANK

...

Figure 22. Horizontal Blanking (HBLK) Pulse Placement

Table 18. CLPOB and PBLK Individual Sequence Parameters

Parameter

Length

Range

Description

Polarity

High/Low

Starting Polarity of Clamp and PBLK Pulses for Sequences 0 to 3

Toggle Position 1

12b

0 to 4095 Pixel Location

First Toggle Position within the Line for Sequences 0 to 3

Toggle Position 2

12b

0 to 4095 Pixel Location

Second Toggle Position within the Line for Sequences 0 to 3

Table 19. HBLK Individual Sequence Parameters

Parameter

Length

Range

Description

HBLKMASK

High/Low

Masking Polarity for H1 for Sequences 0 to 3 (0 = H1 Low, 1 = H1 High).

Toggle Position 1

12b

0 to 4095 Pixel Location

First Toggle Position within the Line for Sequences 0 to 3.

Toggle Position 2

12b

0 to 4095 Pixel Location

Second Toggle Position within the Line for Sequences 0 to 3.

Toggle Position 3

12b

0 to 4095 Pixel Location

Third Toggle Position within the Line for Sequences 0 to 3.

Toggle Position 4

12b

0 to 4095 Pixel Location

Fourth Toggle Position within the Line for Sequences 0 to 3.

Toggle Position 5

12b

0 to 4095 Pixel Location

Fifth Toggle Position within the Line for Sequences 0 to 3.

Toggle Position 6

12b

0 to 4095 Pixel Location

Sixth Toggle Position within the Line for Sequences 0 to 3.

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