AD9925BBCZRL datasheet(20/96 Pages) AD

20 / 96 page

AD9925

Rev. A | Page 20 of 96

Table 11. HBLK Pattern Registers

Length

Range

Description

HBLKMASK

1 b

High/Low

Masking Polarity for H1/H3 (0 = H1/H3 Low, 1 = H1/H3 High).

H3HBLKOFF

1 b

High/Low

Addr 0xE7, Bit [6]. Set = 1 to keep H3/H4 active during HBLK pulse. Normal set to 0.

HBLKALT

2 b

0 to 3 Alternation Mode

Enables Odd/Even A

0 = Disable Alternat

G1 to TOG2 O

G1to TOG

lternation of HBLK Toggle Positions.

ion.

1 = TO

2 = 3 = TO

dd, TOG3 to TOG6 Even.

2 Even, TOG3 to TOG6 Odd.

HBLKTOG1

12 b

0 to 4095 Pixel Location

First Toggle Position within Line for Each Vertical Sequence 0 to 9.

HBLKTOG2

12 b

0 to 4095 Pixel Location

Second Toggle Position within Line for Each Vertical Sequence 0 to 9.

HBLKTOG3

12 b

0 to 4095 Pixel Location

Third Toggle Position within Line for Each Vertical Sequence 0 to 9.

HBLKTOG4

12 b

0 to 4095 Pixel Location

Fourth Toggle Posit

ch Vertical Sequence 0 to 9.

ion within Line for Ea

HBLKTOG5

12 b

0 to 4095 Pixel Location

Fifth Toggle Position within Line for Each Vertical Sequence 0 to 9.

HBLKTOG6

12 b

0 to 4095 Pixel Location

Sixth Toggle Position within Line for Each Vertical Sequence 0 to 9.

Generating S

pecial H LK Patterns

posit

only two of the toggle positions are use

dard HBLK interval. However, the addi

may be used to generate special HBLK

Figure 26. The pattern in this example

tions to generate two extra groups of pu

interval. By changing the toggle positio

atterns can

be created.

n to the HBLKALT register, TOG1

used on odd lines. See the Vertical

Timing Generation section for more information.

There are six oggle

ions availab for HBLK. Normally,

d to generate the stan-

tional toggle positions

patterns, as shown in

uses all six toggle posi-

lses during the HBLK

ns, different p

Generating HBLK Line Alternation

One further feature of the AD9925 is the ability to alternate dif-

ferent HBLK toggle positions on odd and even lines. This may be

used in conjunction with vertical pattern odd/even alternation or

on its own. When a 1 is writte

and TOG2 are used on odd lines, while TOG3 to TOG6 are

used on even lines. Writing a 2 to the HBLKALT register give

the opposite result: TOG1 and TOG2 are used on even lines,

while TOG3 to TOG6 are

HBLK

PROGRAMMABLE SETTINGS:

1. FIRST TOGGLE POSITION = START OF BLANKING.

2. SECOND TOGGLE POSITION = END OF BLANKING.

BLANK

Figure 24. Horizontal Blanking (HBLK) Pulse Placement

HBLK

NOTE

1. THE POLARITY OF H1 DURING BLANKING IS PROGRAMMABLE (H2 IS OPPOSITE POLARITY OF H1).

H1/H3

H2/H4

Figure 25. HBLK Masking Control

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