AD9923ABBCZ datasheet(31/88 Pages) AD

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AD9923A

Rev. 0 | Page 31 of 88

Masking Using Freeze/Resume Registers

As shown in Figure 42 and Figure 43, the FREEZE/RESUME

registers are used to temporarily mask the XV outputs. The

pixel locations to start (FREEZE) and end (RESUME) the

masking create an area in which the vertical toggle positions are

ignored. At the pixel location specified in the FREEZE register,

the XV outputs are held static at their current dc state, high or

low. The XV outputs are held until the internal pixel counter

reaches the pixel location specified by the RESUME register, at

which point the signals continue with any remaining toggle

positions.

Two sets of FREEZE/RESUME registers are provided, allowing

the vertical outputs to be interrupted twice in the same line. The

FREEZE and RESUME positions are enabled using the VMASK

It is not recommended to use FREEZE/RESUME at the same

time as the SWEEP function.

XV1

XV13

NO MASKING AREA

Figure 42. Not Using FREEZE/RESUME

XV1

XV13

NOTES

1. ALL TOGGLE POSITIONS WITHIN THE FREEZE-RESUME MASKING AREA ARE IGNORED. H-COUNTER CONTINUES TO COUNT DURING MASKING.

2. TWO SEPARATE MASKING AREAS ARE AVAILABLE FOR EACH GROUP A, USING FREEZE1/RESUME1 AND FREEZE2/RESUME2 REGISTERS.

MASKING AREA

FOR GROUP A

FREEZE

RESUME

Figure 43. Using FREEZE/RESUME

AD9923ABBCZ 数据表(PDF) 31 Page - Analog Devices