15-reg - ECE2030 Introduction to Computer Engineering...

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10/11/09 1 1 ECE2030 Introduction to Computer Engineering Lecture 14: Registers, Toggle Cells, Counters 2 Registers Register – a collection of binary storage elements In theory, a register is sequential logic, but more often, think of a register as storing a vector of binary values Frequently used to perform simple data storage and data movement and processing operations 3 4-bit Register Register is the most fundamental storage Each 1-bit Flip-flop is a single bit register Cascade 4 of 1-bit FFs = A 4-bit Register 4 Read/Write Control a Register Read: Retrieve data stored inside a flip-flop Write: Update with a new input data into a flip -flop • Given C1 and C2 are continuous clock signals
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10/11/09 2 5 Read/Write Control a Register R/W 6 Register Storage Expectations: A register can store information for multiple clock cycles To “store” or “load” information should be controlled by a signal Process: Use a signal to block the clock to the register, Use a signal to control feedback of the output of the register back to its inputs, or Use flip-flops, that for (0,0) applied, store their state Load is a frequent name for the signal that controls register storage and loading Load = 1: Load the values on the data inputs Load = 0: Store the values in the register 7 Registers with Clock Gating The Load signal enables the clock signal to pass through if 1 and prevents the clock signal from passing through if 0. Example: For Positive Edge-Triggered or Negative Pulse Master-Slave Flip-flop: Clock Load Gated Clock to FF 8 Another Read/Write Control of a Register R/W Clock Gating
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