Technical Specification Summary for Embedded ARM9 System

1. CPU and Architecture
- ARM9 processor, specifically Atmel AT91SAM926EJ core running at 400 MHz.
- 32-bit RISC architecture.

2. Memory
- RAM options: 64 MB to 128 MB DDR2 memory.
- Flash storage: NAND flash memory, size unspecified.

3. Display
- Supports display sizes ranging from 6.5" to 8.4".
- Maximum resolution up to 800x600 pixels.
- Supports video codecs H.264 and VC-1.
- Resistive touch panel support.

4. Operating System
- Windows CE 6.0 supported.

5. Video Hardware and Audio
- High-performance video decoder.
- Audio codec: AC97 standard.
- Stereo earphone jack and internal stereo speaker (8 ohms).

6. Storage and Expansion
- Supports SD/MMC card slot.
- USB 2.0 device and host ports available.
- Multiple serial ports: RS232 (3 ports), RS422, RS485.
- Programmable I/O with 16 pins.

7. Network and Connectivity
- Ethernet: 10/100 Mbps with RMII interface.
- WiFi: IEEE 802.11 b/g/n supported.

8. Power Supply and Operating Conditions
- Input voltage range: 9 to 28 V DC single power supply.
- Operating temperature range: -20°C to 80°C.

9. Additional Features
- Multiple USB ports for device and host functions.
- Programmable PWM channels (4 channels).
- External extension connectors for additional peripherals.

Summary
This embedded system is based on a 400 MHz ARM9 processor with DDR2 memory and NAND flash storage. It supports a mid-sized resistive touch display with video decoding capabilities and runs Windows CE 6.0. Connectivity options include Ethernet, WiFi (b/g/n), multiple serial communication ports (RS232/422/485), and USB 2.0 interfaces. The system is designed for industrial or embedded applications with a wide operating temperature range and flexible power input. Audio and video hardware support multimedia functions, while expansion ports allow for customization and peripheral integration.