This simple datapath is of a single-cycle nature. The instruction begins with the PC.
OR Instruction

The OR instruction performs a bitwise OR operation on both the first source register's contents and the second
source register's
contents, and stores the result in the destination register.

It's syntax is:
OR $destination register's address, $first source register's address, $second source register's address.

The sample OR instruction demonstrated in the datapath above is OR $13, $9, $16.

The instruction's equivalent in binary is:

Information on the content of the registers used:
Register's Address Register's Address (Binary) Register's Value Register's Value (Binary)
$9 01001
$13 01101 To be updated To be updated
$16 10000