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What is a SOC Chip?

What is a SOC Chip?

August 22 , 2023 0

What is an SOC Chip

The definition of SOC varies due to its rich connotation and wide range of applications, making it challenging to provide a precise definition. Generally speaking, SOC (System-on-Chip) refers to a product that is a dedicated integrated circuit with a complete system and embedded software for specific purposes. It is also a technology used to encompass the entire process, starting from determining system functions to software/hardware partitioning and completing the design.

From a narrow perspective, SOC is the integration of the core components of an information system into a single chip.

From a broad perspective, SOC is a miniature system, where if the central processing unit (CPU) is the brain, then the SOC is a system that includes the brain, heart, eyes, and hands. In academic circles, SOC is often defined as a single chip that integrates microprocessors, analog Intellectual Property (IP) cores, digital IP cores, and memory (or off-chip memory interfaces). It is usually customized for specific customers or targeted for specific purposes as standard products.

1.Composition of SOC Chip

The SOC chip comprises control logic modules at the system level, microprocessor/microcontroller CPU core modules, digital signal processor (DSP) modules, embedded memory modules, interface modules for external communication, analog front-end modules containing ADC/DAC, power supply and power management modules. For a wireless SOC, it includes a radio frequency front-end module, user-defined logic (which can be implemented using FPGA or ASIC), and microelectromechanical modules. Most importantly, an SOC chip has embedded basic software modules (RDOS or COS, and other application software) or loadable user software, etc.

2.SOC Formation Process

(1) Co-design and verification based on single-chip integrated systems;

(2)Effective use of logic area technology and capacity occupation ratio to develop and research IP core generation and reuse technology, especially for large-capacity storage module embedding and repeated applications. IP core reuse technology is widely adopted in SOC chip design. Under advanced process conditions, SOC system-level chip design scales are becoming larger, with an explosive increase in the types and quantities of integrated IP on the chip. Efficient management and tracking of IP data become particularly important.

(3) Deep submicron (VDSM) and nanometer integrated circuit design theory and technology.

3.Key Technologies in SOC Design

The key technologies in SOC design include bus architecture technology, IP core reuse technology, software/hardware co-design technology, SOC verification technology, testability design technology, low-power design technology, deep submicron circuit implementation technology, as well as embedded software porting, development, and research. It is an interdisciplinary emerging research field.

Second, the Advantages and Disadvantages of SOC Chips

Advantages:

1.Small chip size: Benefiting from MOS technology, SOC chips can achieve increased functionality while significantly reducing the chip size.
2.Low power consumption: SOC's low power consumption performance can improve the overall usage time of electronic devices such as mobile phones.
3.Reprogrammability: Developers can reprogram SOC chips and reuse IP.
4.Strong reliability: SOC chips enhance circuit security and reduce design complexity.
5.Cost-effectiveness: Compared to other electronic devices, SOC has fewer physical components and can be redesigned.
6.Faster operating speed.

Disadvantages:

1.Long production cycle: The entire process from SOC chip design to manufacturing and delivery takes about 6 months to 1 year.
2.Long design verification time: SOC chip design verification accounts for about 70% of the total cycle.
3.The authorization and compatibility of IP cores significantly affect the product's time to market.
4.Exponential growth in manufacturing costs.
5.SOC is not the best choice for small batch products.

SOC Chip Design Process

1.Functional Design Phase: Designers determine the application scenario of the product, set specifications such as functionality, operating speed, interface specifications, environmental temperature, and power consumption as a basis for future circuit design. They can further plan how to partition software and hardware modules, decide which functions should be integrated into SOC, and which functions can be designed on the circuit board.

2.Design Description and Behavioral-level Verification: After completing functional design, SOC can be divided into several functional modules based on the functionality, and IP cores to be used to implement these functions are determined. This stage indirectly influences the architecture inside SOC and the interaction of signals between various modules, as well as the reliability of future products. Once the modules are determined, they can be designed using hardware description languages such as VHDL or Verilog. Then, functional verification of the design is performed using a hardware description language simulator, considering the logic functionality but not the actual delay of the circuit, to obtain approximate results.

3.Logic Synthesis: After verifying that the design description is correct, logic synthesis is performed using a synthesizer. In this process, an appropriate logic cell library is selected as a reference for synthesizing the logic circuit. The writing style of the hardware language design description file is an important factor that determines the efficiency of the synthesis tool. Some overly abstract syntaxes supported by the synthesis tool may only be suitable as simulation models for system evaluation but not accepted by the synthesis tool. The logic synthesis produces a gate-level netlist.

4.Gate-Level Verification: Gate-level functional verification is at the register-transfer level. The main task is to confirm whether the circuit after synthesis meets the functional requirements. This work is generally accomplished using gate-level verification tools. Note that this stage of simulation needs to consider the delay of gate circuits.

5.Layout and Routing: Layout involves arranging the designed functional modules rationally on the chip and planning their positions. Routing refers to completing the interconnection of various modules.

Please note that the interconnections between various modules are usually relatively long, which can cause significant delays that severely impact the performance of SOC, especially in processes above 0.25 micrometers, where this phenomenon becomes more pronounced.

The development of integrated circuits has a history of 40 years, following Moore's Law, and has now entered the deep submicron stage. Due to the demand of the information market and the development of microelectronics itself, various process integration technologies with micro-fabrication (continuous reduction of integrated circuit feature sizes) as the main feature and application-oriented system-level chips have emerged. With the semiconductor industry entering the era of deep submicron and even nanometer processing, a complex electronic system can be realized on a single integrated circuit chip, such as mobile phone chips, digital TV chips, DVD chips, etc. In the next few years, billions of transistors and tens of millions of logic gates are expected to be integrated onto a single chip.

SOC (System-on-Chip) design technology emerged in the mid-1990s, and with the development of semiconductor process technology, IC designers can integrate increasingly complex functionalities onto a single silicon wafer. SOC is a result of the transformation of integrated circuits (IC) into integrated systems (IS). The Motorola FlexCore system (used to produce custom microprocessors based on 68000 and PowerPC) released in 1994 and the SOC designed by LSILogic for Sony in 1995 were possibly the earliest reports of SOC designs based on Intellectual Property (IP) cores. Since SOC can fully utilize existing design accumulations and significantly improve ASIC design capabilities, it has developed rapidly and attracted attention from both the industry and academia.

SOC is the inevitable trend in the development of integrated circuits, a result of technological development, and the future of the IC industry.

Hong Kong Yatexin Electronics is a leader and innovator in the professional distribution of electronic components. If you are interested in SOC chips or other electronic components, please contact us.