Enet LLD Introduction

Table of Contents

• Introduction
• Application Programming Interface
  • Control path API
  • Data path (DMA) API
  • Life cycle of an Enet LLD based application
• Enet Peripherals
  • CPSW Peripheral
• Document Revision History

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Introduction

The Unified Ethernet Low-Level Driver (Enet LLD) is a driver that aims at providing an unified interface for the different Ethernet peripherals found in TI SoCs.

The Enet LLD is composed of the following layers: top-layer APIs, peripheral layer, module layer and CSL. The diagram below depicts the layers in the Enet LLD.

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Application Programming Interface

The Enet LLD provides two sets of APIs: control and DMA.

Control path API

The control API is an IOCTL-based interface which is used by applications to control the Ethernet peripheral and its submodules.

For further details on the top-level control APIs, refer to the Enet Main API.

Data path (DMA) API

The DMA API is used by applications to perform data movement related operations, such as opening and closing DMA channels, submitting and retrieving packets from the underlying DMA controller.

For further details on the top-level control APIs, refer to the Enet Data Path (DMA).

Life cycle of an Enet LLD based application

The following diagram shows the usage of Enet LLD top-level APIs by local and remote clients.

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Enet Peripherals

Enet LLD supports CPSW peripheral.

CPSW Peripheral

Common Port SWitch (CPSW) subsystems is an IP providing networking functionality. It provide Ethernet packet communication between the connected port(s) and the System on Chip. The total number of ports include host port which is an internal port providing the packet streaming interface to the device internal cores. The external ports are MAC ports supporting Media Independent Interface (MII) like MII, Gigabit Media Independent Interface (GMII), Reduced Media Independent Interface (RMII), Reduced Gigabit Media Independent Interface (RGMII), Serial Gigabit Media Independent Interface (SGMII) and Quad Serial Gigabit Media Independent Interface (QSGMII). The MII modes supported vary based on device variant.

CPSW2G is an integrated Ethernet switch IP with two-port: one MAC ports and a CPPI DMA host port. The CPSW2G switch facilitates the transfer of data between external ports along with internal traffic.

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Document Revision History

Revision	Date	Author	Description	Status
0.1	17 Aug 2020	Misael Lopez	First version	Draft
0.1	1 Sept 2021	Prasad Jondhale	Updates for MCU+ SDK	0.1