Chapter 3 Digital Logic Structures. 3-2 Transistor: Building Block of Computers Microprocessors contain millions of transistors Intel Pentium 4 (2000):

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Presentation transcript:

Chapter 3 Digital Logic Structures

3-2 Transistor: Building Block of Computers Microprocessors contain millions of transistors Intel Pentium 4 (2000): 48 million IBM PowerPC 750FX (2002): 38 million IBM/Apple PowerPC G5 (2003): 58 million Logically, each transistor acts as a switch (open/closed) Combined to implement logic functions AND, OR, NOT Combined to build higher-level structures Adder, multiplexer, decoder, register, … Combined to build processor LC-3

3-3 Simple Switch Circuit Switch open: No current through circuit Light is off V out is +2.9V Switch closed: Short circuit across switch Current flows Light is on V out is 0V Switch-based circuits can easily represent two states: on/off, open/closed, voltage/no voltage. Voltage source

3-4 n-type MOS Transistor MOS = Metal Oxide Semiconductor two types: n-type and p-type n-type when Gate has positive voltage, short circuit between #1 and #2 (switch closed) when Gate has zero voltage, open circuit between #1 and #2 (switch open) Gate = 1 Gate = 0 Terminal #2 must be connected to GND (0V).

3-5 p-type MOS Transistor p-type is complement to n-type when Gate has positive voltage, open circuit between #1 and #2 (switch open) when Gate has zero voltage, short circuit between #1 and #2 (switch closed) Gate = 1 Gate = 0 Terminal #1 must be connected to +2.9V.

3-6 Logic Gates Use switch behavior of MOS transistors to implement logical functions: AND, OR, NOT. Digital symbols: recall that we assign a range of analog voltages to each digital (logic) symbol assignment of voltage ranges depends on electrical properties of transistors being used  typical values for "1": +5V, +3.3V, +2.9V  from now on we'll use +2.9V

3-7 CMOS Circuit Complementary MOS Uses both n-type and p-type MOS transistors p-type  Attached to + voltage  Pulls output voltage UP when input is zero n-type  Attached to GND  Pulls output voltage DOWN when input is one For all inputs, make sure that output is either connected to GND or to +, but not both!

3-8 Inverter (NOT Gate) InOut 0v2.9v 0v InOut 01 Truth table InOut v GND

3-9 NOR Gate (OR-NOT) ABC Note: Serial structure on top, parallel on bottom. Truth table 0 1

3-10 OR Gate (NOR-NOT) Add inverter to NOR. ABC NOR NOT ABC NOR OR = NOR-NOT

3-11 NAND Gate (AND-NOT) ABC Note: Parallel structure on top, serial on bottom. 0

3-12 AND Gate Add inverter to NAND. ABC NAND NOT

3-13 Basic Logic Gates