The hardwired control generator consists of several components that work together to generate the control signals for the execution of instructions in a computer system. These components include:

1. Decoder/Encoder:
The decoder/encoder is responsible for decoding the instruction and generating the control signals based on the opcode and other fields of the instruction. It decodes the instruction and converts it into a set of control signals that are used to control the execution of the instruction.

2. Condition Codes:
Condition codes are used to indicate the status or result of a previous operation or comparison. They are typically stored in a set of registers and are used by the control generator to determine the flow of execution based on the outcome of certain conditions. For example, condition codes can be used to check if a certain condition is true or false and branch to a different part of the program accordingly.

3. Control Step Counter:
The control step counter is a register that keeps track of the current step or stage of the instruction execution. It is used by the control generator to ensure that the instructions are executed in the correct sequence and that the appropriate control signals are generated at each step. The control step counter is incremented after each step, and the control generator uses its value to determine the next step in the instruction execution.

4. All of the mentioned:
The correct answer to the question is option 'D', which states that the hardwired control generator consists of all of the mentioned components. All of these components are essential for the proper functioning of the control generator and for generating the necessary control signals for the execution of instructions.

In summary, the hardwired control generator consists of a decoder/encoder, condition codes, and a control step counter. These components work together to decode instructions, generate control signals, handle condition checking, and ensure the correct sequence of instruction execution.