TNETV1647GSTZWT datasheet(167/236 Pages) TI1

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TMS320DM6441

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SPRS359E – SEPTEMBER 2006 – REVISED AUGUST 2010

6.13.1.4 Hardware 3A (H3A)

The Hardware 3A (H3A) module provides control loops for Auto Focus, Auto White Balance and Auto

Exposure. There are 2 main components of the H3A module:

•

Auto focus (AF) engine

•

Auto exposure (AE) & auto white balance (AWB) engine

The AF engine extracts and filters the Red, Green, and Blue data from the input image/video data and

provides either the accumulation or peaks of the data in a specified region. The specified region is a two

dimensional block of data and is referred to as a “paxel” for the case of AF.

The AE/AWB engine accumulates the values and checks for saturated values in a sub sampling of the

video data. In the case of the AE/AWB, the two-dimensional block of data is referred to as a “window”.

The number, dimensions, and starting position of the AF paxels and the AE/AWB windows are separately

programmable.

The H3A register memory mapping is shown in Table 6-51.

Table 6-51. H3A Register Descriptions

HEX ADDRESS RANGE

DESCRIPTION

0x01C7 1400

PID

Peripheral Revision and Class Information

0x01C7 1404

PCR

Peripheral Control Register

0x01C7 1408

AFPAX1

Setup for the AF Engine Paxel Configuration

0x01C7 140C

AFPAX2

Setup for the AF Engine Paxel Configuration

0x01C7 1410

AFPAXSTART

Start Position for AF Engine Paxels

0x01C7 1414

AFIIRSH

Start Position for IIRSH

0x01C7 1418

AFBUFST

SDRAM/DDRAM Start Address for AF Engine

0x01C7 141C

AFCOEF010

IIR Filter Coefficient Data for SET 0

0x01C7 1420

AFCOEF032

IIR Filter Coefficient Data for SET 0

0x01C7 1424

AFCOEFF054

IIR Filter Coefficient Data for SET 0

0x01C7 1428

AFCOEFF076

IIR Filter Coefficient Data for SET 0

0x01C7 142C

AFCOEFF098

IIR Filter Coefficient Data for SET 0

0x01C7 1430

AFCOEFF0010

IIR Filter Coefficient Data for SET 0

0x01C7 1434

AFCOEF110