Systems Programming. Lecture 2 Review of Computer Architecture I
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1 Systems Programming Lecture 2 Review of Computer Architecture I
2 In The Book Patt & Patel Chapter 1,2,3 (review)
3 Outline Binary Bit Numbering Logical operations 2's complement Binary -> Decimal BCD Ascii Code Binary -> Hex Switches as gates Transistors as swithes CMOS Logic with Transistors Transistors -> Gates DeMorgans Law Larger Gates Combinational Logic Decoder 2-bit Adder, 8-bit adder R-S latch Gated D latch A Register 8-bit register Memory Sequential Logic Shift Register Counter
4 Binary Base 2 numbering system. 1 decimal binary
5 Bit Numbering Least significant bit - Bit with the lowest value LSB 0 - Least Significant Bit is Bit #0 MSB 0 - Most Significant Bit is Bit #0 We will use LSB 0
6 Internet RFC Convention is MSB0 See! MSB0
7 Logical Operations We don't need to review AND, OR, XOR, NOT do we? OR AND
8 Logical Operations NOT = One's Complement NOT NOT
9 Two's Complement Represents signed binary numbers 1s complement and adding one I may frequently show binary as 2 nibbles.
10 Binary to Decimal Add up the decimal values of each binary bit position decimal
11 Anyone recall what Binary Coded Decimal (BCD) is?
12 Binary Coded Decimal BCD is Decimal Numbers represented in binary using 4-bits for each digit of decimal. Makes it easy to store digits decimal = BCD
13 Ascii Code
14 Is ASCII the only way to represent characters?
15 Not ASCII Character Sets PETSCII ISO/IEC 646 DEC MCS ISO/IEC 8859 EBCDIC plenty of others that no one uses anymore. Unicode
16 Binary to Hex Since 1 nibble can represent the full HEX number range (0,1,2,3,4,5,6,7,8,9,A,B,C, D,E,F) its super easy to convert from binary to hex Also why I frequently show my binary bytes as 2 nibble). 231 decimal = = 0xE7 E 7
17 Enough about number systems. Let move on to digital logic.
18 Switches as Inverter We will talk about voltage and current and what makes these thing work next week.
19 NAND and NOR
20 CMOS Metal-Oxide Semiconductor Field Effect Transistors (MOSFET) more suitable for digital electronics. Composed of N type and P type MOSFETs
21 Transistors as Switches n-type MOSFET p-type MOSFET
22 Logic with Transistors NOT NAND
23 Transistors to Gates
24 Gates NAND NOT = AND NOR NOT = OR
25 Gates AND OR OR NOT
26 DeMorgan's Theorem To simplify Circuits: A and B = A or B A or B = A and B
27 Bubble Pushing A shortcut based on DeMorgan's Theorem. 1 - Change AND to OR, OR to AND 2 - Invert all "bubbles" = = =
28 Universal Compatibility NOR or NAND gates can be combined with itself to form any other logic gate = =
29 Combinational Logic Combinational Logic = Digital logic where the output is a function of the input only. Sequential logic = Digital logic where the output depends on the input and the history of the input. In other words, sequential logic has memory while combinational logic does not.
30 Decoder 2 Input Decoder (or a 2 to 4 decoder) AB 1 if AB = 00 1 if AB = 01 1 if AB = 10 1 if AB = 11
31 2-bit Adder Or a Half Adder A0 Carryout Sumout B0 A C HA B S
32 Full Adder A B A C Carryout HA B S A C HA Carryin B S A Cout B FA S Cin Sumout
33 4-Bit Adder MSB LSB A3 B3 A2 B2 A1 B1 A B Cin A B Cin A B Cin FA FA FA Cout S S4 S3 Cout S S2 Cout A0 B0 A B HA S S1 Cout S S0
34 Sequential Logic Combinational Logic = Digital logic where the output is a function of the input only. Sequential logic = Digital logic where the output depends on the input and the history of the input. In other words, sequential logic has memory while combinational logic does not.
35 R-S Latch Store 1 bit of data S R Q Q S R /Q Q not valid set reset 1 1 Q /Q hold
36 Gated D Latch Prevent invalid state of R-S Latch D Q WE Q WE D D Latch /Q Q
37 1-bit Register WE D D Latch Q
38 What can we do with several of these?
39 4-bit Register D3 WE D D2 WE D D1 WE D D0 WE D D Latch D Latch D Latch D Latch Q Q Q Q Q3 Q2 Q1 Q0
40 Clock D D WE D WE D WE /Q Q Q1 D Latch Q /Q Q0 D Latch Q /Q D Latch Q /Q D Latch WE Shift Register Q2 Q3 D
41 JK Flip Flop
42 What do you suppose we can make with these?
43 Counter
44 Need to easily think in binary and hex Bit numbering is LSB0 You can combine simple logic gate to make anything. Combinatorial Logic = Pure function Sequential Logic = Time ZNEO
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