CL-PS7500FE データシートの表示（PDF） - Cirrus Logic

部品番号

コンポーネント説明

メーカー

CL-PS7500FE

System-on-a Chip for Internet Appliance

Cirrus Logic 

CL-PS7500FE

System-on-a-Chip for Internet Appliance

14. VIDEO AND SOUND MACROCELL

The CL-PS7500FE single-chip computer contains a high-performance video and sound controller, capa-

ble of meeting the requirements of a wide range of configurations.

The video and sound macrocell handles all the video processing aspects of the CL-PS7500FE function-

ality, making the CL-PS7500FE suitable for incorporation into a wide range of end products ranging from

portable hand-held LCD systems through to higher performance Super VGA desktop products.

The flexible bus interface provides hardware support for interfacing to DRAM memory systems in conjunc-

tion with the CL-PS7500FE memory controller. The video and sound macrocell obtains data from external

DRAM under DMA control. The macrocell also incorporates a stereo digital sound system, with a serial

sound output port suitable for connection to an external CD DAC.

These features include:

q VGA, Super VGA, XGA resolution

q Three 8-bit DACs giving 16M colors

q Direct driving of LCD or CRT screens

q 1-, 2-, 4-, 8-, 16-, 32-bpp modes

q Up to 120-MHz pixel rate

q Very low power consumption

14.1 Features

14.1.1 Flexible Video System

The video and sound macrocell contains 288 write-only registers that offer a high degree of flexibility to

the system programmer. Two hundred fifty-six of these registers are used as the 28-bit video palette

entries. These registers are programmed through an auto-incrementing address pointer. The remaining

registers are specific control registers and allow the user to program display parameters.

14.1.2 Hardware Cursor

The video and sound macrocell has a hardware cursor for all display modes:

q Normal

q HiRes

q LCD

By offering cursor support on chip, the designer benefits in speed and lower software overhead. The cur-

sor is 32-pixels wide and any number of pixels high, and can be displayed in four colors, including trans-

parent from its own 28-bit-wide palette. A cursor of any shape and size can be defined within the

32-pixel-wide limit.

14.1.3 Palette

The video subsystem has a 28-bit-wide, 256-entry palette where each entry uses 8 bits for Red, Green

and Blue and 4 bits for external data. These external bits can be used outside the device for a variety of

purposes (such as supremacy, fading, HiRes, and LCD driving).

June 1997

ADVANCE DATA BOOK v2.0

VIDEO AND SOUND MACROCELL

135

Share Link: