Question

Formulate a mapping procedure that provides eight consecutive microinstructions for each routine. the operation code has six bits and the control memory has 2048 words.

Answer 1

opcode = 6 bit
control memory = 2048 words = 11 bits of address
mapping from 6 bits = 11 bit
                 xxxxxx
 Ans =   00xxxxxx000

Answer 2

Here's  a mapping procedure that provides eight consecutive microinstructions for each routine.

• First, the six-bit operation code is received as input.
• The operation code is used as an address to access the control memory.
• The control memory word at that address is read and the microinstruction stored in it is fetched.
• The fetched microinstruction is decoded to determine the next microinstruction to be executed.
• The next microinstruction address is calculated by adding 1 to the current address.
• The control memory word at the calculated address is read and the next microinstruction is fetched.
• Steps 4-6 are repeated until 8 consecutive microinstructions have been fetched and executed.
• The routine is completed and the process is repeated for the next operation code.

Note: The number of microinstructions for each routine could be different, and this mapping procedure can be modified to fetch the desired number of microinstructions for each routine.

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