ADE3700 datasheet(42/89 Pages) STMICROELECTRONICS

42 / 89 page

LCD Scaler

ADE3700

42/89

2.10

LCD Scaler

The LCD Scaler module resizes images from one resolution to another. It employs a 3x3 non-

separable scaling filter which performs a dot product of the input pixel values with a weighting

vector that is computed from the chosen filtering function. To sharpen text without introducing

excessive artifacts, the output pixel’s contrast level is adjusted based on the context value

measured over a 3x3 grid in the relevant area of the source image.

For proper scaler operation, the SCLK frequency must be set greater than the max of DCLK and

IN_HPIXEL x DCLK_FREQ / (DEST_HPIXEL x PIXEL_AVG).

DMEAS_SCR_PAD_0

0x0934

[7:0]

0x0

Scratch Pad Registers

DMEAS_SCR_PAD_1

0x0916

R/W

[7:0]

DMEAS_SCR_PAD_2

0x0917

R/W

[7:0]

DMEAS_SCR_PAD_3

0x0918

R/W

[7:0]

DMEAS_SCR_PAD_4

0x0919

R/W

[7:0]

DMEAS_SCR_PAD_5

0x091A

R/W

[7:0]

DMEAS_SCR_PAD_6

0x091B

R/W

[7:0]

DMEAS_SCR_PAD_7

0x091C

R/W

[7:0]

DMEAS_SCR_PAD_8

0x091E

R/W

[7:0]

DMEAS_SCR_PAD_9

0x091F

R/W

[7:0]

DMEAS_SCR_PAD_10

0x0920

R/W

[7:0]

DMEAS_SCR_PAD_11

0x0921

R/W

[7:0]

DMEAS_SCR_PAD_12

0x0922

R/W

[7:0]

DMEAS_SCR_PAD_13

0x0923

R/W

[7:0]

DMEAS_SCR_PAD_14

0x0924

R/W

[7:0]

DMEAS_SCR_PAD_15

0x0925

R/W

[7:0]

Table 15: LCD Scaler Registers (Sheet 1 of 3)

Addr

Mode

Bits

Default

Description

SCL_SRC_HPIX_L

0x0A01

R/W

[7:0]

0x0

Input Horizontal Resolution

Bits [3:0] must be set to zero.

SCL_SRC_HPIX_H

0x0A02

R/W

[7:0]

SCL_SRC_VPIX_L

0x0A03

R/W

[7:0]

0x0

Input Vertical Resolution

Bits[3:0] must be set to 0.

SCL_SRC_VPIX_H

0x0A04

R/W

[7:0]

SCL_SCALEFACH_L

0x0A05

R/W

[7:0]

0x0

17-bit Horizontal Scale Factor = (in_hpixel

<< 16) / dest_hpixel + 0.5

SCL_SCALEFACH_M

0x0A06

R/W

[7:0]

0x0

SCL_SCALEFACH_H

0x0A07

R/W

[0]

0x0

SCL_SCALEFACV_L

0x0A08

R/W

[7:0]

0x0

16-bit Vertical Scale Factor = (in_vpixel <<

15) / dest_vpixel + 0.5

SCL_SCALEFACV_H

0x0A09

R/W

[7:0]

0x0

Table 14: Data Measurement Registers (Sheet 3 of 3)

Addr

Mode

Bits

Default

Description

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