Chapter 6 I CMOS Layout of Complexe Gate

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Chapter 6 (I) CMOS Layout of Complexe Gate Designing Combinational Logic Circuits March 28,

Chapter 6 (I) CMOS Layout of Complexe Gate Designing Combinational Logic Circuits March 28, 2003 1 EE 141 Chapter 6: Combinational

Example Gate: NAND 2 EE 141 Chapter 6: Combinational

Example Gate: NAND 2 EE 141 Chapter 6: Combinational

Example Gate: NOR 3 EE 141 Chapter 6: Combinational

Example Gate: NOR 3 EE 141 Chapter 6: Combinational

Complex CMOS Gate B A C D OUT = D + A • (B

Complex CMOS Gate B A C D OUT = D + A • (B + C) A D B C 4 EE 141 Chapter 6: Combinational

Constructing a Complex Gate OUT = D + A • (B + C) 5

Constructing a Complex Gate OUT = D + A • (B + C) 5 EE 141 Chapter 6: Combinational

Stick Diagrams Contains no dimensions Represents relative positions of transistors VDD Inverter NAND 2

Stick Diagrams Contains no dimensions Represents relative positions of transistors VDD Inverter NAND 2 Out In GND A B 6 EE 141 Chapter 6: Combinational

Stick Diagrams Logic Graph A j X C C B X = C •

Stick Diagrams Logic Graph A j X C C B X = C • (A + B) C A i i X B B PUN A B C VDD j GND A PDN PUN: Pull-up Network, PDN: Pull-down Network 7 EE 141 Chapter 6: Combinational

Two Versions of C • (A + B) A C B A B C

Two Versions of C • (A + B) A C B A B C VDD X GND Two Strips Line of Diffusions X GND One Strip Line of Diffusions 8 EE 141 Chapter 6: Combinational

Consistent Euler Path (Insert D of textbook) X C i X B VDD j

Consistent Euler Path (Insert D of textbook) X C i X B VDD j GND A A B C 9 EE 141 Chapter 6: Combinational

OAI 22 Logic Graph A C B D X = (A+B) • (C+D) C

OAI 22 Logic Graph A C B D X = (A+B) • (C+D) C D A B C VDD X B A B C D PUN A GND PDN 10 EE 141 Chapter 6: Combinational

Example: x = ab+cd Euler Paths For both PUD and PDN 11 EE 141

Example: x = ab+cd Euler Paths For both PUD and PDN 11 EE 141 Chapter 6: Combinational

Cell Design q Standard Cells (gate collection) § General purpose logic § Can be

Cell Design q Standard Cells (gate collection) § General purpose logic § Can be synthesized § Same height, varying width q Datapath Cells § For regular, structured designs (arithmetic) § Includes some wiring in the cell § Fixed height and width 12 EE 141 Chapter 6: Combinational

Standard Cell Layout Methodology – 1980 s VDD Routing channel VDD signals GND 13

Standard Cell Layout Methodology – 1980 s VDD Routing channel VDD signals GND 13 EE 141 Chapter 6: Combinational

Standard Cell Layout Methodology – 1990 s Mirrored Cell No Routing channels VDD M

Standard Cell Layout Methodology – 1990 s Mirrored Cell No Routing channels VDD M 2 M 3 GND Mirrored Cell EE 141 14 Chapter 6: Combinational

Standard Cells N Well VDD Cell height 12 metal tracks Metal track is approx.

Standard Cells N Well VDD Cell height 12 metal tracks Metal track is approx. 3 + 3 Pitch = repetitive distance between objects Cell height is “ 12 pitch” 2 Cell boundary In Out GND Rails ~10 15 EE 141 Chapter 6: Combinational

Standard Cells VDD With minimal diffusion routing In Out VDD With silicided diffusion In

Standard Cells VDD With minimal diffusion routing In Out VDD With silicided diffusion In GND Out GND 16 EE 141 Chapter 6: Combinational

Standard Cells VDD A 2 -input NAND gate B Out GND 17 EE 141

Standard Cells VDD A 2 -input NAND gate B Out GND 17 EE 141 Chapter 6: Combinational

Outline Introduction CMOS devices CMOS technology CMOS logicOutline Introduction CMOS devices CMOS technology CMOS logic
EE 4271 VLSI Design CMOS Combinational Gate CMOSEE 4271 VLSI Design CMOS Combinational Gate CMOS
CMOS technology and CMOS Logic gate Transistors inCMOS technology and CMOS Logic gate Transistors in
Flow Gate Flow Gate UTM Flow Gate FlowFlow Gate Flow Gate UTM Flow Gate Flow
GATE General Architecture for Text Engineering GATE GATEGATE General Architecture for Text Engineering GATE GATE
Flow Gate Flow Gate UTM Flow Gate FlowFlow Gate Flow Gate UTM Flow Gate Flow
TACHE COMPLEXE GRA OrlansTours Tche Complexe Natation AlineTACHE COMPLEXE GRA OrlansTours Tche Complexe Natation Aline
TACHE COMPLEXE GRA OrlansTours Tche Complexe Cirque NTACHE COMPLEXE GRA OrlansTours Tche Complexe Cirque N
TACHE COMPLEXE GRA OrlansTours Tche Complexe Handball 5meTACHE COMPLEXE GRA OrlansTours Tche Complexe Handball 5me
TACHE COMPLEXE GRA OrlansTours Tche Complexe Escalade NiveauTACHE COMPLEXE GRA OrlansTours Tche Complexe Escalade Niveau
Complexe stromen NWD 2009 Aad Goddijn 1 ComplexeComplexe stromen NWD 2009 Aad Goddijn 1 Complexe
REACTII CU FORMARE DE COMBINATII COMPLEXE Combinaiile complexeREACTII CU FORMARE DE COMBINATII COMPLEXE Combinaiile complexe
TACHE COMPLEXE GRA OrlansTours Tche Complexe Handball NivTACHE COMPLEXE GRA OrlansTours Tche Complexe Handball Niv
TACHE COMPLEXE GRA OrlansTours Tche Complexe Acrosport CPTACHE COMPLEXE GRA OrlansTours Tche Complexe Acrosport CP
Het complexe Belgi Het complexe Belgi Deel 1Het complexe Belgi Het complexe Belgi Deel 1
Le complexe Majeur Dhistocompatibilit CMH Le complexe CMHLe complexe Majeur Dhistocompatibilit CMH Le complexe CMH