Computer architecture and organization book pdf

Is computer organization difficult?
To answer your question, it can be difficult.
For me it was one of the most challenging classes but also one of the my most interesting ones.
You gain an understanding of what occurs at 7 different layers of abstraction (similar in theory to the OSI model used in networking but different)..
What is computer organization and computer architecture?
Computer Organization.
Computer Architecture is concerned with the way hardware components are connected together to form a computer system.
Computer Organization is concerned with the structure and behaviour of a computer system as seen by the user.
It acts as the interface between hardware and software..
Computer Organization is realization of what is specified by the computer architecture .
It deals with how operational attributes are linked together to meet the requirements specified by computer architecture.
Some organizational attributes are hardware details, control signals, peripherals.
Instruction Set Architectures
An Instruction Set Architecture (ISA) defines the communication rules between the hardware and software of the computer.
The ISA is a design principle (conceptual) and not stored in a computer's memory.

Is computer organization difficult?