AD9937 datasheet(34/44 Pages) AD

34 / 44 page

REV. 0

–34–

AD9937

12-BIT

HD COUNTER

8-BIT

LM COUNTER

HBLKTOG1

SPHSTARTx

HBLKTOG2

HBLKTOG3

LMSTART1

HBLKTOG3

8-BIT

LM COUNTER

SPHSTARTx

SPECIAL

H1A

SPH1A1

H1A

345

PROGRAMMING NOTES

1. THERE ARE TWO SPHSTART REGISTERS. THEY ARE SPHSTART0 AND SPHSTART1.

SPHSTART0 IS USED WHEN THE LM0 PULSE IS SELECTED BY SETTING LMPATSEL = 0.

SPHSTART1 IS USED WHEN THE LM1 PULSE IS SELECTED BY SETTING LMPATSEL = 1.

2.THIS REGION REPRESENTS NORMAL H1A OUTPUTS.

3.THIS REGION REPRESENTS SPECIAL H1A PATTERN BEING OUTPUT DURING THE LM REP 1.

THE SPH1A1 REGISTER IS USED TO SET THE SPECIAL H1A PATTERN IN THIS REGION.

4.THIS REGION REPRESENTS SPECIAL H1A PATTERN BEING OUTPUT DURING THE LM REP 2.

THE SPH1A2 REGISTER IS USED TO SET THE SPECIAL H1A PATTERN IN THIS REGION.

5.THIS REGION REPRESENTS SPECIAL H1A PATTERN BEING OUTPUT DURING THE LM REP 3.

THE SPH1A3 REGISTER IS USED TO SET THE SPECIAL H1A PATTERN IN THIS REGION.

6.THIS REGION REPRESENTS NORMAL H1A OUTPUTS.

PROGRAMMING NOTES

1.THIS EXAMPLE SHOWS H1A OUTPUT FOR REGION 3 ABOVE.

IN THIS EXAMPLE: SPH1A1 = 110101.

2.THE SPECIAL H PATTERN STARTING POLARITY CAN BE INDEPENDENTLY SET FOR EACH H OUTPUT

USING THE POL REGISTERS LISTED IN TABLE XVI. NOTE: THE SPECIAL H STARTING POLARITY WILL

OCCUR AT THE START OF SPHSTARTx. (ABOVE: H1APOL = 0)

PIXEL

CLOCK

LMSTART0

Figure 28. Example of Programming the Special H-Output Patterns

HBLKTOG2

H1TOG12POL

132

133

134

135

868

1560

1559

823

824

825

H1MASKPOL

H1TOG34POL

131

HBLKTOG3

HBLKTOG4

HBLKTOG1

HMASK

HBLK

Figure 29. Example of Horizontal HMASK Masking

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