1, the composition of the different
PCB board generally includes program ID (PID, process handle), PID is generally a plastic number; characteristics of the information, generally divided into the system process, the user process, or kernel process, etc.; the process state, running, ready, blocking, indicating that the process is now running; priority, indicating that the size of the priority of the right to control the CPU; communications information, a reflection of the communication relationship between the processes; site protection area, etc..
PCBA board to glass fiber, non-woven material, as well as the resin composed of the insulating part, and then epoxy resin and copper foil pressed into the adhesive sheet used.
2, the role of the different
PCB's role is to make a multi-channel program environment can not run independently of the program (including data), to become a basic unit that can run independently of a process that can be executed concurrently with other processes; it is the process can be process scheduling program on the CPU to execute the program code segments.
Excellent circuit design in PCBA boards can save production costs and achieve good circuit performance and thermal performance.
3, essentially different
PCB is the only sign of the existence of the process, PCB process control block is a static description of the process. PCB is the electronic components of the support body, is the provider of electronic components line connection.
PCBA board essentially belongs to the production process, PCB empty board after SMT on the pieces, or after the DIP plug-in the entire process.
Baidu Encyclopedia-PCB
Baidu Encyclopedia-PCBA