SystemVerilog Testbench Introduction

SystemVerilog Testbench Architecture

APB Interface

APB Transaction

APB Generator

APB Driver

APB Driver Phase 2

APB Monitor

APB Scoreboard

APB Environment

APB Testbench Top

RISC-V Processor (YARP) Interface

YARP Transaction

YARP Generator

YARP Driver

YARP Data Memory Model

YARP Monitor

YARP Scoreboard

YARP Testbench Top

DVCon 26 Hackathon Problem

Array Sum Limit

Array Index Sum Limit

Ball Draw No Repeat

Conditional Even Probability

Even Odd Index Value

Five Consecutive Ones

Frequency Constraint

Grouped Ones

Index Value Range

Leap Year

Matrix Rotation

Non Adjacent Ones

Power of 4

Dynamic Ranges

Recent Four Unique

Row Max Unique

Subarray Max Sum

Three Duplicates Only

Tic Tac Toe

Unique 3D Array

Weighted Popcount

Unique Sum

Split Array into Queues

# Grouped Ones

## Problem Statement

Given a 32-bit binary value, ensure that all 1s are grouped together consecutively. Valid patterns are: all 0s, all 1s, or a block of 1s followed by all 0s.

This constraint ensures that the binary representation follows a "grouped" pattern where 1s never appear on both sides of a 0.

## Constraints
- Value size: 32 bits
- Pattern: All 1s must be consecutive (1s cannot have 0s between them)

## Examples

### Example 1:
```
0x0000000F
00000000000000000000000000001111
Valid
Explanation: Four consecutive 1s at the end, followed by 0s
```

### Example 2:
```
0xFFFFFFFF
11111111111111111111111111111111
Valid
Explanation: All 1s (completely grouped)
```

### Example 3:
```
0x00000000
00000000000000000000000000000000
Valid
Explanation: All 0s (no 1s to group)
```

### Example 4:
```
0xFF000000
11111111000000000000000000000000
Valid
Explanation: 8 consecutive 1s followed by all 0s
```

### Example 5:
```
0x0F0F0F0F
00001111000011110000111100001111
Invalid
Explanation: 1s are separated by 0s - not grouped together
```

### Example 6:
```
0xF0FF0000
11110000111111110000000000000000
Invalid
Explanation: 1s appear on both sides of a 0 block in the middle
```
