AD9923ABBCZ datasheet(20/88 Pages) AD

20 / 88 page

AD9923A

Rev. 0 | Page 20 of 88

Individual HBLK Patterns

The HBLK programmable timing shown in Figure 26 is similar

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

Only the toggle positions are used to designate the start and end

positions of the blanking period. Additionally, there is a polarity

control register, HBLKMASK, that designates the polarity of the

horizontal clock signals during the blanking period. Setting

HBLKMASK high sets H1 = H3 = high and H2 = H4 = low

during blanking, as shown in Figure 27. As with CLPOB and

PBLK registers, HBLK registers are available in each V-sequence,

allowing different blanking signals to be used with different

vertical timing sequences.

Generating Special HBLK Patterns

There are six toggle positions available for HBLK. Normally,

only two of the toggle positions are used to generate the

standard HBLK interval. However, additional toggle positions

can be used to generate special HBLK patterns, as shown in

Figure 28. 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.

Table 12. HBLK Pattern Registers

Length

(Bits)

Range

Description

HBLKMASK

High/low

Masking polarity for H1, H3, HL (0 = mask low, 1 = mask high)

HBLKALT

0 to 7 alternation

modes

Enables different odd/even alternation of HBLK toggle positions

0: disable alternation (HBLKTOGE1 to HBLKTOGE6 registers are used for each line)

1: TOGE1 and TOGE2 odd lines, TOGE3 to TOGE6 even lines

2: TOGE1 and TOGE2 even lines, TOGE3 to TOGE6 odd lines

3: TOGE1 to TOGE6 even lines, TOGO1 to TOGE6 odd lines (FREEZE/RESUME not

available)

4 to 7: HBLKSTART, HBLKEND, HBLKLEN, and HBLKREP registers are used for each line

HBLKTOGE1

0 to 8191 pixel

location

HBLK first toggle position (for even lines only when HBLKALT = 3)

HBLKTOGE2

0 to 8191 pixel

location

HBLK second toggle position (for even lines only when HBLKALT = 3)

HBLKTOGE3

0 to 8191 pixel

location

HBLK third toggle position (for even lines only when HBLKALT = 3)

HBLKTOGE4

0 to 8191 pixel

location

HBLK fourth toggle position (for even lines only when HBLKALT = 3)

HBLKTOGE5

0 to 8191 pixel

location

Fifth toggle position, even lines (HBLKSTART when HBLKALT = 4 to 7)

HBLKTOGE6

0 to 8191 pixel

location

Sixth toggle position, even lines (HBLKEND when HBLKALT = 4 to 7)

HBLKLEN

0 to 8191 pixels

HBLK pattern length, only used when HBLKALT = 4 to 7

HBLKREP

0 to 255 repetitions

Number of HBLK pattern repetitions, only used when HBLKALT = 4 to 7

HBLKTOGO1

0 to 8191 pixel

location

First toggle position for odd lines when HBLKALT = 3 (usually VREPA_3)

HBLKTOGO2

0 to 8191 pixel

location

Second toggle position for odd lines when HBLKALT = 3 (usually VREPA_4)

HBLKTOGO3

0 to 8191 pixel

location

Third toggle position for odd lines when HBLKALT = 3 (usually FREEZE1)

HBLKTOGO4

0 to 8191 pixel

location

Fourth toggle position for odd lines when HBLKALT = 3 (usually RESUME1)

HBLKTOGO5

0 to 8191 pixel

location

Fifth toggle position for odd lines when HBLKALT = 3 (usually FREEZE2)

HBLKTOGO6

0 to 8191 pixel

location

Sixth toggle position for odd lines when HBLKALT = 3 (usually RESUME2)

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