AD9923ABBCZ datasheet(36/88 Pages) AD

36 / 88 page

AD9923A

Rev. 0 | Page 36 of 88

Pixel 2 and Pixel 9 within a single HD line. However, in

multiplier mode the toggle positions are multiplied by

VLEN = 4; therefore, the first toggle occurs at pixel count = 8,

and the second toggle occurs at pixel count = 36. Sweep mode is

also enabled to allow the toggle positions to cross the HD line

boundaries.

The MULTI function only applies to signals assigned to Group A.

It cannot be used at the same time as the TWOGROUP function or

if any signals are assigned to Group B.

Table 18. Multiplier Mode Register Parameters

Length

(Bits)

Range

Description

MULTI

High/low

High enables multiplier mode

XVPOL

High/low

Starting polarity of XV1 to XV13 signals in each VPAT group

XVTOG

0 to 8191 pixel location

Toggle positions for XV1 to XV13 signals in each VPAT group

VLEN

0 to 8191 pixels

Used as multiplier factor for toggle position counter

VREP

0 to 4095

VREPE/VREPO should be set to the value of the highest XVTOG value

XV1 TO XV13

VLEN

MULTIPLIER MODE V-PATTERN GROUP PROPERTIES:

1START POLARITY (ABOVE: STARTPOL = 0).

2FIRST AND SECOND TOGGLE POSITIONS (ABOVE: XVTOG1 = 2, XVTOG2 = 9).

3LENGTH OF VPAT COUNTER (ABOVE: VPATLEN = 4); THIS IS THE MINIMUM RESOLUTION FOR TOGGLE POSITION CHANGES.

4TOGGLE POSITIONS OCCUR AT LOCATION EQUAL TO (XVTOG × VPATLEN).

5IF SWEEP REGION IS ENABLED, THE V-PULSES MAY ALSO CROSS THE HD BOUNDRIES, AS SHOWN ABOVE.

12 3412 341 2341 2341 2341 234 1234 1234 123 4123 4

START POSITION OF VPAT GROUP IS STILL PROGRAMMED IN THE V-SEQUENCE REGISTERS

PIXEL

NUMBER

12 3456 789 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

Figure 49. Example of Multiplier Region for Wide Vertical Pulse Timing

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