STV2050A datasheet(49/83 Pages) STMICROELECTRONICS

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STV2050A - CONVERGENCE

– the CDN bit (refer to Section 9.7 "MANUFACTURING, AFTER-SALES SERVICE, LAB TRI-

AL MODES" on page 49).

During normal operation mode, the convergence outputs deliver a signal computed as shown

in Figure 26 "Convergence Values Computation Path" on page 45.

However, during the convergence frame retrace defined by the DCB and DCT values as de-

scribed in Section 5.4.4 "Convergence Correction Frame Retrace" on page 26, only the field

offset canceller values are output. This is used to reduce the power in the convergence ampli-

fiers.

9.7 MANUFACTURING, AFTER-SALES SERVICE, LAB TRIAL MODES

9.7.1 Output of Field Offset Values

This mode is used to output the field offset values defined in the D2 and D3 registers.

It is controlled by the CDN bit in the E3 register.

9.7.2 Gain and Offset Measuring Line

This mode is used as a manual control of the measuring line used, for example, in the elec-

trical loop. (Refer to Section 11.1 "PRINCIPLE OF OPERATION" on page 55.)

During the gain measuring line:

– The dynamic values are replaced for each channel by the CRH[7:0] and CRV[7:0] bits for

red, CGH[7:0] and CGV[7:0] bits for green and CBH[7:0] and CBV[7:0] for blue in the DC and

DD registers for horizontal and vertical values, respectively,

– The polarity of these latter values may be changed using the PMH and PMV bits in the D5

– The gain value is stored in the E0 register for the coarse value, but the fine values are stored

in the MVR[7:0] bits for red, MVG[7:0] bits for green and MVB[7:0] bits for blue in the E8 reg-

ister.

During field offset measuring lines, the value applied to the DACs for each channel are given

by MVR[7:0] for red, MVG[7:0] for green, MVB[7:0] for blue in register E8

The manual measuring line mode is enabled using the MLE bit in the D5 register.

This may be programmed when the measuring line is inserted using the MLN[8:0] bits in the

D5 register.

This signal is made available on pin 75 (MLIN).

CDN

0: Offset values

1: Normal operation

MLE

0: Manual measuring line disabled

1: Manual measuring line enabled

STV2050A Datasheet(PDF) 49 Page - STMicroelectronics