參數(shù)資料
型號： BT458LG165
英文描述： Video DAC with Color Palette (RAMDAC)
中文描述： 視頻DAC的調(diào)色板（的RAMDAC）
文件頁數(shù)： 35/60頁
文件大?。?/td> 647K
代理商： BT458LG165
Bt457/Bt458
4.0 Application Information
125 MHz/135 MHz/165 MHz Monolithic CMOS 256 Color Palette RAMDAC
4.1 Clock Interfacing
L45801 Rev. N
Conexant
4-3
CLOCK and CLOCK* should be restarted so that the first edge of the signals
is as close as possible to the rising edge of LD*. (The falling edge of CLOCK
leads the rising edge of LD* by no more than 1 clock cycle or follows the rising
edge of LD* by no more than 1.5 clock cycles). When the clocks are restarted, the
minimum clock pulse width must not be violated.
When the Bt457/458 is reset to an eight-clock-cycle pipeline delay, the blink
counter circuitry is not reset. Therefore, if multiple Bt457/458s are used in
parallel, the on-chip blink counters cannot be synchronized. In this instance, the
blink mask register should be $00, and the overlay blink enable bits should be
logical 0s. Software can control blinking through the read mask register and
overlay display enable bits.
In standard operation, the Bt457/458 must be reset only following a power-up
or reset condition. Under these circumstances the on-chip blink circuitry can be
used.
Bt457 Color Display
Applications
For color display applications in which up to four Bt457s are used, it is
recommended that the Bt439 Clock Generator Chip be used to generate the clock
and load signals. It supports the 4:1 and 5:1 input multiplexing of the Bt457,
synchronizes the clock and load signals to subpixel resolution, and sets the
pipeline delay of the Bt457 to eight clock cycles. The Bt439 can also be used to
interface the Bt457 to a TTL clock.
Figure 4-3
illustrates use of the Bt439 with
the Bt457.
相關(guān)PDF資料
PDF描述
BT458LPJ110 Video DAC with Color Palette (RAMDAC)
BT458LPJ125 Video DAC with Color Palette (RAMDAC)
BT458LPJ135 Video DAC with Color Palette (RAMDAC)
BT458LPJ165 Video DAC with Color Palette (RAMDAC)
BT458LPJ80 Video DAC with Color Palette (RAMDAC)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
BT458LPJ110 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Video DAC with Color Palette (RAMDAC)
BT458LPJ125 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Video DAC with Color Palette (RAMDAC)
BT458LPJ135 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Video DAC with Color Palette (RAMDAC)
BT458LPJ165 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Video DAC with Color Palette (RAMDAC)
BT458LPJ80 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Video DAC with Color Palette (RAMDAC)
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