EF_PWM32

A dual channel 32-bit PWM generator with a clock divider and support for both Edge and Center Alignment Modes.

The generator comes with bus wrapper for AHB lite, APB and WB (classic) buses.

General Information

• Maturity: Integrated
• Certification: EF Certified
• Provider: Efabless
• License: Open Source
• Category: Pulse Width Modulation
• Foundry: N/A
• Node: N/A
• PDK: Soft IP

Installation:

You can either clone repo or use IPM which is an open-source IPs Package Manager

• To clone repo: git clone https://github.com/efabless/EF_PWM32.git
• To download via IPM , follow installation guides here then run ipm install EF_PWM32

Overview

The PWM module is capable of producing two PWM signals on pwmA and pwmB ports. The PWM signals are generated out of a 32-bit counter which is compared to the values cmpA and cmpB. The counter has two modes of operation:

• Mode 1 (Up/Down counting): from 0 to top then back to 0
• Mode 0 (Up counting): from 0 to top

There 6 events (e0 to e5) while in mode 1. Four of these 6 events are available in mode 0. Each of the PWM ports can be configured to perform different actions at each one of the events. The actions are:

• Change to high
• Change to low
• Toggle/Invert
• No Change

Clocking

There is a clock divider that can divide the system clock by 2, 4, 8 or 16. the output of this clock divider is used to clock the counter.

Ports

‡ 00:none, 01:high, 10:low, 11:invert

Bus Wrappers

AHB-Lite, APB and WB bus wrappers are provided.

I/O Registers