VDP313XY datasheet(51/76 Pages) MICRONAS

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ADVANCE INFORMATION

VDP 313xY

Micronas

2.14.2.2. Calculation of Vertical and East-West

Deflection Coefficients

In Table 2–9 and Table 2–10 the formula for the calcu-

lation of the deflection initialization parameters from

the polynominal coefficients a,b,c,d,e is given for the

vertical and East-West deflection. Let the polynomial

The initialization values for the accumulators a0..a3 for

vertical deflection and a0..a4 for East-West deflection

are 12-bit values. The coefficients that should be used

to calculate the initialization values for different field

frequencies are given below, the values must be

scaled by 128, i.e. the value for a0 of the 50 Hz vertical

deflection is:

P : a + b(x – 0.5) + c(x – 0.5)2 + d(x – 0.5)3 + e(x – 0.5)4

a0 = (a · 128 – b · 1365.3 + c · 682.7 – d · 682.7) / 128

Table 2–9: Calculation of Initialization values for

Vertical Sawtooth

Vertical Deflection 50 Hz

128

–1365.3

682.7

–682.7

899.6

–904.3

1363.4

296.4

–898.4

585.9

Vertical Deflection 60 Hz

128

–1365.3

682.7

–682.7

1083.5

–1090.2

1645.5

429.9

–1305.8

1023.5

Table 2–10: Calculation of Initialization values for

East-West Parabola

East-West Deflection 50 Hz

128

–341.3

1365.3

–85.3

341.3

111.9

–899.6

84.8

–454.5

586.8

–111.1

898.3

72.1

–1171.7

756.5

East-West Deflection 60 Hz

128

–341.3

1365.3

–85.3

341.3

134.6

–1083.5

102.2

–548.4

849.3

–161.2

1305.5

125.6

–2046.6

1584.8

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