AD9923ABBCZ datasheet(22/88 Pages) AD

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AD9923A

Rev. 0 | Page 22 of 88

Generating HBLK Line Alternation

The AD9923A can alternate different HBLK toggle positions on

odd and even lines. This feature can be used in conjunction with

V-pattern odd/even alternation, or on its own. When 1 is written

to the HBLKALT register, HBLKTOGE1 and HBLKTOGE2 are

used on odd lines, and HBLKTOGE3 to HBLKTOGE6 are used

on even lines. Writing 2 to the HBLKALT register gives the oppo-

site result: HBLKTOGE1 and HBLKTOGE2 are used on even

lines, and HBLKTOGE3 to HBLKTOGE6 are used on odd lines.

When 3 is written to the HBLKALT register, all six even toggle

positions, HBLKTOGE1 to HBLKTOGE6, are used on even

lines. There are also six additional toggle positions, HBLKTOGO1

to HBLKTOGE6, for odd lines. These registers are normally

used for VPAT Group A, VPAT Group B, and freeze/resume

functions, but when HBLKALT = 3, these registers become the

odd line toggle positions for HBLK.

Another HBLK feature is enabled by writing 4, 5, 6, or 7 to

HBLKALT. In these modes, the HBLK pattern is generated using

a different set of registers—HBLKSTART, HBLKEND, HBLKLEN,

and HBLKREP—along with four toggle positions. This allows

for multiple repeats of the HBLK signal, as shown in Figure 32.

HBLK

ALTERNATING H-BLANK PATTERN USING HBLKALT = 1 MODE

HL/H1/H3

H2/H4

HBLKTOGE1

HBLKTOGE2

HBLKTOGE3

HBLKTOGE4

HBLKTOGE5

HBLKTOGE6

ODD LINE

EVEN LINE

Figure 29. HBLK Odd/Even Alternation Using HBLKALT = 1

HBLK

ALTERNATING H-BLANK PATTERN USING HBLKALT = 2 MODE

HBLKTOGE3

HBLKTOGE5

HBLKTOGE4

HBLKTOGE6

HL/H1/H3

H2/H4

ODD LINE

EVEN LINE

HBLKTOGE1

HBLKTOGE2

Figure 30. HBLK Odd/Even Alternation Using HBLKALT = 2

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