VPC3232D datasheet(49/78 Pages) MICRONAS

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ADVANCE INFORMATION

VPC 323xD, VPC 324xD

Micronas

3.2.1. Calculation of Vertical and East-West

Deflection Coefficients

In Table 3–4 the formula for the calculation of the

deflection initialization parameters from the polynomi-

nal coefficients a,b,c,d,e is given for the vertical and

East-West deflection. Let the polynomial be

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

3.2.2. Scaler Adjustment

In case of linear scaling, most of the scaler registers

need not be set. Only the scaler mode, active video

length, and the fixed scaler increments (scinc1/scinc2)

must be written.

The adjustment of the scaler for nonlinear scaling

modes should use the parameters given in table 3–5.

An example for ‘panorama vision’ mode with 13.5 MHz

line-locked clock is depicted in Fig. 3–2. The figure

shows the scaling of the input signal and the variation

of the scaling factor during the active video line. The

scaling factor starts below 1, i.e. for the borders the

video data is expanded by scaler 2. The scaling factor

becomes one and compression scaling is done by

scaler 1. When the picture center is reached, the scal-

ing factor is held constant. At the second border the

scaler increment is inverted and the scaling factor

changes back symmetrically. The picture indicates the

function of the scaler increments and the scaler win-

dow parameters. The correct adjustment requires that

pixel counts for the respective windows are always in

number of output samples of scaler 1 or 2.

Table 3–4: Tables for the Calculation of Initialization values for Vertical Sawtooth and East-West Parabola

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

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

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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