How many address lines does a 256kb memory device have?
The address bus will therefore need to be 14 bits wide (or more) to give a unique address to every location with that much memory. 1024 x 4 means 2^10 address lines. 2K bytes= 2048 x 8 means 2^11 address lines.
How many wires does an address bus need?
log (base 2) 2^18 = 18. Thus, 18 bits are needed for the logical address to be specified. Therefore 18 physical wires could be used to create the bus.
How much memory is addressable on a 16 bit address bus?
The width of the address bus determines the amount of memory a system can address. For example, a system with a 16-bit address bus can address 2^16 memory locations. If each memory location holds one byte (8 bits), the addressable memory space is 644 KB of memory.
How many address locations are possible if size of address bus is 16 bit?
A 16-bit integer can store 216 (or 65,536) distinct values. In an unsigned representation, these values are the integers between 0 and 65,535; using two’s complement, possible values range from −32,768 to 32,767. Hence, a processor with 16-bit memory addresses can directly access 64 KB of byte-addressable memory.
What is the smallest address?
0x1000
What is the largest memory address?
The 1620 used 5-digit decimal addresses, so in theory the highest possible address was 99,999. In practice, the CPU supported 20,000 memory locations, and up to two optional external memory units could be added, each supporting 20,000 addresses, for a total of 60,000 (00000–59999).
What is the size of address for I O space?
64K
How do you read a PLC address?
Elements are addressed by number following the colon after the file designator, and individual bits within each element addressed by a number following a slash mark. For example, the first bit (bit 0) of the second element in file 3 (Binary) would be addressed as B3:2/0.
What is absolute addressing mode?
An absolute address is represented by the contents of a register. An absolute address is represented by the contents of a register. This addressing mode is absolute in the sense that it is not specified relative to the current instruction address. The target address is a specific register, not an input operand.
What is absolute addressing with example?
An explicit identification of hardware, such as a memory location, peripheral device, or location within a device. For example, memory byte 107,443, disk drive 2 and sector 238 are absolute addresses.
What is absolute addressing mode with example?
In this mode, the data is directly copied from the given address to the register. This absolute addressing mode is also called a direct addressing mode. For example LDA 3000H: means the data at address 3000H is copied to register A.
Which is direct addressing mode?
Direct addressing mode means that the value for a given instruction in assembly programming is pointed to by a given value. This means the value is variable, based on what is stored in memory at a given address.
What is direct addressing Sanfoundry?
What is direct addressing? Explanation: Direct addressing is possible only when we can afford to allocate an array that has one position for every possible key.