TABLE 1. Input Mode Definition

INPUT FORMAT

FIXED VERTICAL,

FIXED HORIZONTAL

determined by the INPUT

CONTROL REGISTER bits [1:0]

HORIZONTAL

DATA START

VERTICAL

DATA START

FIXED VERTICAL,

FIXED HORIZONTAL

(FIX VERTICAL = 1,

FIX HORIZONTAL = 1)

Programmable from HSYNC Falling Edge

(# INPUT CLKS)

Programmable from VSYNC

Falling Edge

(# HSYNC PERIODS)

FIXED VERTICAL,

ENAB HORIZONTAL

(FIXED VERTICAL = 1,

FIXED HORIZONTAL = 0)

Data Valid during ENAB high (HSYNC is

IGNORED)

Programmable from VSYNC

Falling Fdge

(# HSYNC PERIODS)

ENAB ONLY

(FIXED VERTICAL = 0,

FIXED HORIZONTAL = 0)

Data Valid during ENAB High (HSYNC is

IGNORED)

First ENAB after ENAB low for

greater than one line time (VSYNC

is IGNORED)

Note: INPUT CONTROL REGISTER bit[2] “Enab Detection” provides for “auto-detection” of ENAB. When “1” and Enab is not toggling, the controller will automatically

set the input mode to Fixed Vertical, Fixed Horizontal.

www.national.com

9