STV2050A datasheet(18/83 Pages) STMICROELECTRONICS

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STV2050A - RAM ALLOCATION

4 RAM ALLOCATION

4.1 CONVERGENCE CORRECTION VALUES

The convergence correction values are either dedicated to each correction point of each red/

blue/green channel, or common for all points of each channel. (Refer to Section 9 "CONVER-

GENCE" on page 45.)

The values are grouped into 2 families:

– Dynamic correction values

– Common correction values

4.1.1 Dynamic Correction Values

The dynamic values are stored as described in Section 2.2 "Overview OF EMBEDDED RAM

ORGANIZATION" on page 13.

For each Red, Green and Blue channel, the following can be stored in the embedded RAM:

– 13 horizontal "dynamic" correction values on 10 bits, plus 1 parity bit

– Up to 16 vertical "dynamic" correction values on 10 bits, plus 1 parity bit

For each correction point there is one corresponding word in the 00(hex) to CF(hex) sub-ad-

dress range. Bits are stored in the corresponding “Red Bank”, “Green Bank” and “Blue Bank”

as follows:

– Bit D1[3] is the horizontal correction parity bit

– Bit D1[2] is the vertical correction parity bit

– Bits D1[3:2] are generated by the STV2050A. Their value can be read out only.

Note: The STV2050A automatically checks the parity bits of each convergence value before applying

them to the DACs. Refer to Section 14 "SECURITIES" on page 62.

The sub-address corresponds to the coordinates of the point on the screen where the vertical

and horizontal lines meet, as shown in the following figure:

MSB

LSB

BYTE D0

BYTE D1

BYTE D2

Bit

765

432107

65432

107654

3210

Horizontal Correction[9:0]

Vertical Correction[9:0]

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