LM2467 datasheet(17/43 Pages) NSC

部件名	LM2467

功能描述	150 MHz I2C Compatible RGB Preamplifier with Internal 254 Character OSD ROM, 512 Character RAM and 4 DACs

PDF	43 Pages

Scroll/Zoom	100%

制造商	NSC [National Semiconductor (TI)]

网页	http://www.national.com

标志

17 / 43 page

Programmable Horizontal Blank

The leading edge position of the internal horizontal blank can

be programmed with respect to the horizontal flyback zero

crossing leading edge in steps of 4 OSD pixels up to a

maximum of 16 steps as shown below in Figure 12. This

start position of the horizontal blanking pulse is only pro-

grammable to occur before the horizontal flyback zero cross-

ing edge, and cannot be programmed in the opposite direc-

tion. The trailing edge of the horizontal blanking pulse is

independent of the programmable leading edge, and its

relativity to the Horizontal flyback trailing edge remains un-

changed. To use this feature, Horizontal Blanking (0x843A[0]

which is enabled by default) and Programmable Horizontal

Blanking (0x843A[2]) must be enabled. The number of steps

is programmed with the bits in 0x843A[6:3]. When this fea-

ture is disabled, please refer to the H-Blank Time Delay - On

specification (+ Zero Crossing of I

HFB to 50% of output

blanking end) listed under the System Interface Signal Char-

acteristic section.

20075752

FIGURE 12. Programmable Internal H. Blank

LM2467 数据表(PDF) 17 Page - National Semiconductor (TI)