Implement a memory block (RAM/ROM) to store instructions or data for the processor.
1. Design and simulate read/write operations for a 16x8 or 32x8 memory block.
2. Explore addressing mechanisms (immediate, direct, register, indirect).
A simplified representation of a RAM module includes key components for data interaction with the CPU. Data is transferred via n-bit Data In/Out lines, where 'n' signifies the data bus width. A Write/Read control line determines whether data is being written to or read from memory. The specific memory location is selected using m-bit Address lines, with 'm' determining the addressable memory space (2^m locations). In operation, the CPU provides data and an address; the RAM then either stores the data at the specified address (Write operation) or retrieves the data from that address (Read operation), providing fast, temporary storage for active processes.
Logisim Files can be accessed here:
(To be downloaded and opened in logisim)
RAM (Random Access Memory) is a type of volatile memory used by computers and devices to store data that is actively being used or processed. It allows quick access to data, improving the speed of operations. The key feature of RAM is that it can read and write data rapidly, making it essential for multitasking and smooth performance.
Volatile Memory: RAM loses its data when the power is turned off.
Temporary Storage: Used for storing data and instructions that the CPU needs for ongoing tasks.
Speed: Much faster than other types of storage like hard drives or SSDs.
Capacity: More RAM means the ability to handle more applications and tasks simultaneously.
Code Memory:
The ROM is used to store program instructions or code that does not change during execution. This type of memory is often non-volatile.
Address Lines (A): The left side of the diagram (labeled with 0000, 0001, 0002, etc.) represents the address lines, which specify the memory locations being accessed.
Data Lines (D): The right side (labeled with "000000") shows the data stored at each address. Each address corresponds to a fixed value that is hard-coded into the ROM.
Memory Size:
The address range (e.g., 0000 to 0003) suggests there are 4 memory locations.
The data width (6 bits) is indicated by "000000" at each address.
Total memory size = 4×64 \times 64×6 bits = 24 bits.
sel (Select Signal): The "sel" line at the bottom is likely the chip select or enable signal, used to activate the ROM for read operations