RTM

Question 1

what is a register file?

Answer 1

an array of registers

Question 2

what does the register file circuit do?

Answer 2

• contains the array of registers
• each register holds a word (a binary number)
• enables to specify an address and read out that register
• enables to specify another address and load a data value into that register

Question 3

how does demux work?

Answer 3

The operation is determined by the control signals ld, d, sa, sb

• The data input is x, and there are two data outputs a,b

We need a way to take a destination register number (e.g. R0 or R1 for a register file with 2 registers)
and tell just that register to perform a load

• This is done with a demultiplexer– R0 and R1 each need an individual load control

– The register selected by d gets a load control of 1

– The register not selected by d gets a load control of 0