AXI MCDMA Standalone Driver

Introduction

This page gives an overview of axi mcdma driver which is available as part of the Xilinx Vivado and SDK distribution.

The Xilinx® LogiCORE™ IP AXI MultiChannel Direct Memory Access (AXI MCDMA) core is a soft Xilinx IP core for use with the Xilinx Vivado® Design Suite. The AXI MCDMA provides high-bandwidth direct memory access between memory and AXI4-Stream target peripherals. The AXI MCDMA core provides Scatter Gather interface with Multiple Channel support with independent configuration.

How to enable

Source Path for the driver
https://github.com/Xilinx/embeddedsw/tree/master/XilinxProcessorIPLib/drivers/mcdma

Driver source code is organized into different folders. Below diagram shows the axicdma driver source organization

AXI MCDMA
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-- doc - Provides the API and data structure details

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-- data - Driver tcl and MDD file.
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- examples - Reference application to show how to use the driver APIs and calling sequence
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- src- Driver source files

Features Supported

Controller Features

AXI4 Compliant
AXI4 data width support of 32, 64, 128, 256, 512 and 1,024 bits
AXI4-Stream data width support of 8, 16, 32, 64, 128, 256, 512 and 1,024 bits
Supports up to 16 independent Channels
Supports per Channel Interrupt output
Supports DRE alignment for Streaming data Width of up to 512 bits
Supports up to 64MB transfer per BD
Optional AXIS Control and Status Streams

Standalone Driver Supported Features

The AXI MCDMA Standalone driver supports the following:

Supports upto 16 Channels
Supports Scatter/Gather Direct Memory Access (DMA)
Supports 64-bit Addressing
Supports Optional Data Re-Alignment Feature
Supports per channel interrupt
Supports AXIS Control and Status Streams.

Test cases

Refer below pah for testing different examples for each feature of the IP.

xmcdma_interrupt_example.c: This example demonstrates how to use axi mcdma driver on axi mcdma core to transfer packets in interrupt mode.
xmcdma_polled_example.c: This example demonstrates how to use axi mcdma driver on axi mcdma core to transfer packets in polled mode

Known issues and Limitations

All IP features are supported

Change Log

2019.2

None

2019.1

Add HasRxLength field in config and channel structure
Remove dependency on HPC_DESIGN macro
In driver tcl enable CCI only for EL1 non-secure state
Remove snooping enable from application

Commit ID:

e295490 mcdma: Add submit() variant to program additional BD fields
09087c8 mcdma: Add HasRxLength field in config and channel structure
7cf77a5 mcdma: Sync doxygen documentation
30f38de mcdma: examples: Remove dependency on HPC_DESIGN macro
9bcdf44 mcdma: In driver tcl enable CCI only for EL1 non-secure state
8937c2a mcdma: examples: Remove snooping enable from application

2018.3

Support 64 bit DMA addresses for Microblaze-X
Support hierarchical designs.
Read buffer length register width and num channels from IP config.
Code refactoring and fix gcc warning.
Provide interface to do lookup by baseaddress and access Sw ID field in BD.
Export APIs to use in LwIP202 contrib source.

Commit ID:

b87f96d Support 64 bit DMA addresses for Microblaze-X

04abde6 Update get_cells argument to support hierarchical designs

2984937 Read buffer length register width from IP config

f846cffe Fix typos and rephrase comment description

54d6909 Remove unused define for buffer length mask

b396c42 Enable 'Import Examples' link in system.mss
67b0f6d Fix gcc 'pointer from integer without a cast' warning

def3a92 Read num channels from IP configuration

d61b2f1 Add API to lookup config by base address

9542b71 Add macros to access Sw ID field in BD

debf203 Export APIs to use in LwIP202 contrib source

2018.2

None

2018.1:

Fix bugs in the driver tcl
Fix unused variable warning.

Commit ID:
35c3c30 mcdma: Fix bugs in the driver tcl
bdc9deb mcdma: Fix unused variable warning
2017.4:

None.

2017.3:

Added support for MCDMA IP

Commit ID:
6b7af95 : Initial version of the driver