ARCHITECTURAL OVERVIEW

The S3C24A0A is a 16/32-bit RISC microprocessor, designed to provide a cost-effective, low power, and high performance micro-controller solution for mobile phones and general applications. To provide a sufficient H/W performance for the 2.5G & 3G communication services, the S3C24A0A adopts dual-32-bit bus architecture and includes many powerful hardware accelerators for the motion video processing, serial communications, and etc. For the real time video conferencing, an optimized MPEG4 H/W Encoder/Decoder is integrated.

FEATURES

This section will explain the features of the S3C24A0A. Figure 1-1 is an overall block diagram of the S3C24A0A.

MICROPROCESSOR AND OVERALL ARCHITECTURE

? SoC (System-on-Chip) for mobile phones and general embedded applications.

? 16/32-Bit RISC architecture and powerful instruction set with ARM926EJ-S CPU core.

? ARM’s Jazelle Java technology enhanced ARM architecture MMU to support WinCE, Symbian and Linux

? Instruction cache, data cache, write buffer and Physical address TAG RAM to reduce the effect of main memory bandwidth and latency on performance

? 4 way set-associative cache with I-Cache (16KB) and D-Cache (16KB).

? 8-words per line with one valid bit and two dirty bits per line

? Pseudo random or round robin replacement algorithm.

? Write through or write back cache operation to update the main memory.

? The write buffer can hold 16 words of data and four addresses.

? ARM926EJ-S core supports the ARM debug architecture

? Internal AMBA (Advanced Microcontroller Bus Architecture) (AMBA2.0, AHB/APB)

? Dual AHB bus for high-performance processing (AHB-I & AHB-S)

MEMORY SUBSYSTEM

? High bandwidth Memory subsystem with two access channels (accesses from two AHB buses) and three-channel memory ports

? Double the bandwidth with the simultaneous access capability

? ROM/SRAM/NOR-Flash/NAND-Flash channel

? One SDRAM channels

? Up to 1GB Address space

? Low-power SDRAM interface support : Mobile SDRAM function

– DS: Driver Strength Control

– TCSR: Temperature Compensated Self-Refresh Control

– PASR: Partial Array Self-Refresh Control

? NAND Flash Boot Loader with the ECC circuitry to support booting from NAND Flash

– 4KB Stepping Stone

– Support 1G, 2G bit NAND Flash