FS401LF datasheet(18/104 Pages) ETC2

18 / 104 page

FS401, FS403

PRODUCT SPECIFICATION

REV. NO. 1.7

JANUARY 24, 2007

4.2 Internal Micro-Controller Programming

4.2.1 Input Calibration

The internal micro-controller needs to know what portion of the input video signal contains active video.

Determining this information is referred to as Input Calibration. The input calibration information is used

by the internal micro-controller to calculate the low-level registers that scale the input image to fit on the

output device.

The internal micro-controller stores the input calibration information as 4 ratios that describe the active

video area in relation to the total input video signal. These 4 ratios are:

SHV

(Number of pixel times from HSync to the start of the active video) / (The total pixel times

from HSync to HSync) * 65536

HAT

(Number of active pixels) / (The total pixel times from HSync to HSync) * 65536

SVV

(Number of lines from VSync to the start of the active video) / (The total lines from VSync to

VSync) * 65536

VAT

(Number of active lines) / (The total lines from VSync to VSync) * 65536

For example, if the input video signal has 1138 pixel times from HSync to HSync, only 1024 of the pixels

are active, and the first active pixel is at pixel time 57, then SHV and HAT would be:

SHV = 57 / 1138 * 65536

HAT = 1024 / 1138 * 65536

There are two methods of determining the input calibration: auto input calibration and manual input

calibration. Additionally, the internal micro-controller can store the input calibration for 4 video modes.

4.2.1.1 Auto Input Calibration

When the FS400 is in auto input calibration mode, then the internal micro-controller will use the active

video registers (SHV, EHV, SVV, and EVV) to determine the input calibration. The internal micro-

controller will sample the active video registers until their values stabilize for at least 600 milliseconds.

The internal micro-controller will wait up to 3 seconds for the active video registers to stabilize. If the

active video register do not stabilize, the internal micro-controller will revert to the default input calibration

information to display the image. Additionally, if the input calibration values calculated from the active

video registers are outside of the minimums and maximums allowed, the internal micro-controller will

revert to the default input calibration information. The internal micro-controller will continue to sample the

active video registers. If the registers do stabilize at a later time, the default input calibration will be

replaced with the calculated input calibration.

After the initial input calibration is acquired, the internal micro-controller continues to sample the active

video registers. If the input calibration calculated from the new sample indicates a larger active video

area, then the new input calibration is used.

Auto input calibration is enabled by clearing the DSICAL bit in the SCR register. This is the default mode

of operation. There is nothing else an external controller need to do to allow automatic calibration to

work. However, an external controller can modify the behavior of auto input calibration by changing the

following configuration values via the CCR and CDR registers.

CCR_DEF_SHV

Default Start of Horizontal Video

CCR_MIN_SHV

Minimum Start of Horizontal Video

CCR_MAX_SHV

Maximum Start of Horizontal Video

CCR_DEF_HAT

Default Horizontal Active

CCR_MIN_HAT

Minimum Horizontal Active

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