ECE 120 Lecture Notes - Lecture 24: Out 1, Sequential Logic, Register Transfer Language

• School: University of Illinois
• Department: Electrical and Computer Engineering
• Course: ECE 120
• Professor: Kindratenko Volodymyr

Document Summary

So far in this course we"ve presented combinational as well as sequential logic. The course will now focus on computer architecture and how a microprocessor actually works. A useful concept at this stage is looking at circuits at the register transfer level, or rtl. When designing a real microprocessor, we don"t really care about the gate-level implementation of a circuit. We just care about what goes into registers and the higher-level logic operations performed. Rtl (register transfer language) is a shorthand for describing data in registers, In rtl: s1 : r0 r1, s1"s2 : r0 r2. A buffer is a device that passes an input to its output. A tri-state buffer is a device with 3 output states: 0, 1, and z" (high impendence) Z: z, or hi-z output means disconnected - no output appears at all, we can build a tri-state buffer using just a few mos fets.