712 HDC Classifier :: Quicker, easier and cheaper to make your own chip!

712 : HDC Classifier

Author: Shivashankar Ravindra Ugar, Tarun S K, Shylashree N, RV College of Engineering

Description: 8-bit Hyperdimensional Computing classifier with two class prototypes

Clock: 10000000 Hz

Credits

We gratefully acknowledge the Center of Excellence (CoE) in Integrated Circuits and Systems (ICAS) and the Department of Electronics and Communication Engineering (ECE) for providing the necessary resources and guidance. Special thanks to Dr. H V Ravish Aradhya (HoD- ECE), Dr. K R Usha Rani (Associate Dean-PG), Dr. K. S. Geetha (Vice Principal) and Dr. K. N. Subramanya (Principal) for their constant encouragement and support in facilitating this Tiny Tapeout SKY26C submission.

HDC Classifier

An 8-bit Hyperdimensional Computing (HDC) classifier implemented in Verilog. The design compares an input vector with two class prototypes and determines the closest matching class using Hamming distance.

How it works

The classifier receives an 8-bit input data vector through ui[7:0].

The input vector is compared with two class prototypes. The design calculates the Hamming distance between the input data and each prototype. The class with the smaller distance is selected as the winner.

The calculated distance is provided through uo[5:0], while the winning class is indicated by uo[6]. The DONE signal on uo[7] indicates that the classification operation is complete.

Input signals

Pin	Signal	Description
`ui[7:0]`	`DATA[7:0]`	8-bit input data
`uio[0]`	`MODE`	Operating mode
`uio[1]`	`CLASS_SEL`	Class selection
`uio[2]`	`VALID`	Indicates valid input
`uio[3]`	`START`	Starts the classification operation

Output signals

Pin	Signal	Description
`uo[5:0]`	`DIST[5:0]`	Calculated Hamming distance
`uo[6]`	`WINNER`	Selected class
`uo[7]`	`DONE`	Indicates classification is complete

How to test

Reset the design using rst_n.
Apply the 8-bit input data on ui[7:0].
Configure MODE and CLASS_SEL as required.
Set VALID high to indicate valid input data.
Assert START to begin the classification operation.
Wait until DONE becomes high.
Read the selected class from WINNER.
Read the calculated Hamming distance from DIST[5:0].

External hardware

No external hardware is required.

The design uses the standard Tiny Tapeout clock and reset signals.

#	Input	Output	Bidirectional
0	DATA[0]	DIST[0]	MODE
1	DATA[1]	DIST[1]	CLASS_SEL
2	DATA[2]	DIST[2]	VALID
3	DATA[3]	DIST[3]	START
4	DATA[4]	DIST[4]
5	DATA[5]	DIST[5]
6	DATA[6]	WINNER
7	DATA[7]	DONE

Input

Output

Bidirectional

DATA[0]

DIST[0]

MODE

DATA[1]

DIST[1]

CLASS_SEL

DATA[2]

DIST[2]

VALID

DATA[3]

DIST[3]

START

DATA[4]

DIST[4]

DATA[5]

DIST[5]

DATA[6]

WINNER

DATA[7]

DONE

Chip location

712 HDC Classifier