Advance Information

JPEG Codec SD interface
256K Embedded Display SRAM Image Processor

CMOS

SSD1926 is an image processor designed for advanced car AV device with image capture and process features. 

The image files can be saved into SD/MMC card through SD interface. The JPEG file is retrieved back from SD/MMC card, decoded and displayed on LCD panel through LCD interface. This interface supports various kinds of LCD panel like STN, CSTN and TFT. 

The LCD controller of SSD1926 supports LCD panel for mobile phone with size, for example, 176x220 and 240x160 resolution at color depth 1, 2, 4, 8, 16 and 32 bit-per-pixel (bpp). For 16 and 32 bpp, SSD1926 provides 2D graphics acceleration features like virtual display, image rotation, cursor display, line drawing, BitBLT with raster operation, color fill, color expansion etc.

SSD1926 is able to interface different type of generic microcontrollers that are popular in handheld devices market. It also support indirect addressing mode which can minimize the pin count of control signals. 

Internal PLLs is built such that only single clock is required for SSD1926 to generate clocks for blocks with various clock speed requirement.

With advanced power management design, SSD1926 is suitable for low power consumption and advanced image applications etc. The SSD1926 is available in LQFP package.

The main features of the SSD1926 are as follows.

1. Hardware JPEG Codec

1. Hardware codec to encode and decode JPEG image with variable size up to 1280x1024

2. JPEG Code is consisted of the following hardware module

   1. Discrete Cosine Transform (DCT) and Inverse Discrete Cosine Transform (iDCT)

   2. Quantization calculation with table downloadable by software

   3. Zigzag and run-length coding

   4. Huffman encoding and decoding with table downloadable by software

3. For viewing JPEG image on LCD panel, the JPEG decoder can decimate and crop the image such that the length is in multiple of 8.

2. 2D Graphic Engine

1. Screen panning and scrolling - virtual display mode

2. Image rotation including 0, 90, 180, 270 degree

3. Two cursors with three colors and transparency selection. Cursor blinking is available

4. Line drawing

5. Rectangle drawing

6. Ellipse drawing

7. Bit block transfer (BitBLT)

   1. Host to frame buffer

   2. Frame buffer to frame buffer

   3. Total 256 three-operand raster operations (ROP3) working with BitBLT

   4. Pattern BitBLT: Source image is repeatedly filled up destination block

   5. Stretch BitBLT: Stretch the source image to a destination larger or smaller than the source

   6. Color Expansion: Monochrome color is expanded to either background or foreground color. 

   7. Color Fill: Fill a rectangular block with a single color.

3. LCD Graphic Controller

1. Support 1, 2, 4, 8, 16 and 32 bit-per-pixel (bpp) color depth

2. In 32bpp mode, each pixel is consisted of 8-bit red, 8-bit green, 8-bit blue and 8-bit alpha channel for controlling the transparency of the image. 

3. In 1, 2, 4, 8bpp mode, it can display still image and has no 2D graphic engine feature available. 

4. Arbitrary image size supported up to horizontal resolution of 512.

4. LCD Panel Interface

1. Support the following type of LCD panels:

   1. Monochrome and color STN 4/8/12/16 bit interface

   2. TFT 9/12/18 bit interface

   3. 18 bit HR-TFT interface

   4. 8 bit Serial TFT interface

   5. 8 bit Delta panel with sub-pixel accuracy algorithm

   6. Support Smart LCD panels through SPI and 8-bit MCU (8080,6800) interface 

2. For STN and CSTN panel, spatial and dynamic dithering is available to increase color depth

   1. 16 gray shades for each color component when applying frame rate control only

   2. 64 gray shades for each color component when applying frame rate control and dithering

3. LCD panel power on and off sequencing

5. Host MCU interface

1. Support the following MCU interface

   1. SRAM interface (e.g. generic ARM core type MCU)

   2. ISA interface for MCU like NEC MIPS

   3. 8/16 bits 6800/8080 indirect addressing mode

2. Support synchronous and asynchronous interface communication

3. Memory mapped I/O

4. Big/Little endian support

6. MMC/SD Interface

• Compatible with "The Multimedia Card System Specification version 3.0"

• Compatible with "SD Memory Card Specification version 1.0" and "SDIO Card Specification version 1.0"

• Block transfer from/to external host

• Block transfer from/to internal memory

• Supports many SD functions including multiple I/O and combined I/O and memory

9. Package

• 128-pin LQFP package