E-Voting Machine

E-Voting Machine

• Group M1• Bohyun Jessica Kim• Jonathan Chiang• Chi Ho Yoon• Donald Cober

Mon, Nov 3Layout, Layout, Layout

Secure Electronic Voting Terminal

Status

• FSMs are not complete (3/4 done)• Layout finished for COMMs block but not

globally connected• SRAMs and row decoders finished• Transistors:

88780 Layout:6964

LVS:6652

640:Analog Sim

COMMS Full Schematic

Components

FF 8 bit (2)

FF_C 16 bit (1)

XOR 8 bit (4)

Inv (1)

FA 8bit (4)

FA 16 bit (1)

FA shift 4/5 bit (4)

8 bit 2:1 MUX(4)

COMMS Layout Status Update

•Layout finished and LVS’ed for both 8-bit encryption parts

•Layout finished for 16-bit sum generator (16 bit adder + flip-flop)

•Need to do global routing to hook up all 8-bit and16-bit parts

•Size got a little bigger (before: 66 by 80, now: 77 by 80) – because of added functions (FF that clears, muxes, etc)

•Roadblock 2:1 8-bit MUX layout: Very difficult to wire I/O from covered M1,

hard to pull contact. Already tried multiple versions of 1 bit cell MUX.

Revisit MUXES

Old New

Preserves 5.7150 height .Eliminates metal 2 interconnectA lot easier for routing

Problem: Minimum contact to P-well diffusion of 8-bit flip flop spacing 0.45 is violated with new design.

Comms 8-bit Cipher Encryption Schematics

Components

FF 8 bit (2)

XOR 8 bit (4)

Inv (1)

FA 8bit (4)

FA shift 4/5 bit (4)

8 bit 2:1 MUX(4)

LVS: Partition LVS into 8-bit and 16-bit segments

Comms 8-bit Layout

Comms 8-bit Layout Instances / M3+M4

Comms 16-bit Layout

Comms 16-bit Layout Instances / M3

After global wiring within COMMS blockit will look like a square

FSM Layout Status Update

Registers are complete, LVSing and simulating

Floorplan of the FSMs are complete

Layout of Random Logic in the FSMs has not been started

FSM supporting blocks (message rom, user input reg, etc ) have not been started

FSM Floorplan

FSM Floorplan

FSM Floorplan

SRAM Layout Status Update

Row decoders are complete and LVSing

Cell Matrix has been confirmed

SRAM layout is known

SRAM Decoder Layout

SRAM Matrix Layout

SRAM and Decoder Layout

Floorplan Old vs New

TODO:

For Wednesday: Complete final floorplanComplete FSMs (LVS)Complete COMMs

For Monday: Complete Global interconnectsComplete connection blocks