AD9925BBCZRL datasheet(25/96 Pages) AD

25 / 96 page

AD9925

Rev. A | Page 25 of 96

RESUME register is reached, at which point the signals will

ontinue with any remaining toggle positions. Two sets of

FREEZE/RESUME registers are provided, allowing the vertical

utputs to be interrupted twice in the same line. The FREEZE

nd RESUME positions are programmed in the vertical pattern

roup registers, but are enabled separately using the VMASK

gisters. The VMASK registers are described in the Vertical

Sequences (VSEQ) section.

Masking Using FREEZE/RESUME Registers

As shown in Figure 33, the FREEZE/RESUME registers are us

to temporarily mask the XV outputs. The pixel locations to

begin the masking (FREEZE) and end the masking (RESUME)

create an area in which the vertical toggle positions are ignored

At the pixel location specified in the FREEZE register, the XV

outputs will be held static at their current dc state, high or low

The XV outputs are held until the pixel location specified by the

XV1

XV8

NO MASKING AREA

Figure 32. No Vertical Masking

XV1

XV8

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 VPAT GROUP, USING FREEZE1/RESUME1 AND FREEZE2/RESUME2 REGISTERS.

MASKING AREA

FOR XV1 TO XV8

FREEZE

RESUME

Figure 33. Vertical Masking Using the FREEZE/RESUME Registers

AD9925BBCZRL 数据表(PDF) 25 Page - Analog Devices