AD9923A データシートの表示（PDF） - Analog Devices

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AD9923A

CCD Signal Processor with V-Driver and Precision Timing Generator

Analog Devices 

Hold Area Using FREEZE/RESUME Registers

The FREEZE/RESUME registers can also be used to create a

hold area, in which the XV outputs are temporarily held and

then later resume at the point where they were held. As shown

in Figure 44, this is different than using the VMASK register,

AD9923A

because the XV outputs continue from where they stopped (as

opposed to having the pixel counter run continuously), with

any toggle positions that fall between the FREEZE and

RESUME locations being ignored. Signals assigned to Group B

are not affected by the hold area.

HD

XV1

XV11

HOLD AREA

FREEZE FOR GROUP A RESUME

XV12

XV13

NOTES

1. WHEN HOLD = 1 FOR ANY V-SEQUENCE, THE FREEZE AND RESUME REGISTERS ARE USED TO SPECIFY THE HOLD AREA FOR GROUP A.

2. ABOVE EXAMPLE: ALL XV-OUTPUTS ARE ASSIGNED TO GROUP A.

3. H-COUNTER FOR GROUP A (XV1 TO XV13) STOPS DURING HOLD AREA.

Figure 44. Hold Area for Group A

HD

HOLD AREA

FOR GROUP A

FREEZE

RESUME

XV1

XV11

XV12

XV13

NO HOLD

AREA FOR

GROUP B

NOTES

1. ABOVE EXAMPLES: XV12 AND XV13 ARE ASSIGNED TO GROUP B.

2. GROUP B DOES NOT USE HOLD AREA.

Figure 45. Group B Does Not Use Hold Area

Rev. A | Page 31 of 84

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