This page gives an overview of the bare-metal driver support for the Xilinx® LogiCORE™ IP Arasan SD 3.0 host controller.
Table of Contents
eight data lines. In SD mode, data transfers in 1-bit and 4-bit modes. In eMMC mode, data transfers in 1-bit, 4-bit, and 8-bit modes. The interface can be routed through the MIO
multiplexer to the MIO pins or through the EMIO to the SelectIO pin in the PL. The controller is accessed by the APU and RPU via the AXI bus. The controller also includes
a DMA unit with an internal FIFO to meet throughput requirements.
The source code for the driver is included with the Vitis Unified Software Platform installation, as well as being available in the Xilinx Github repository.
|Driver Name||Path to Vitis||Path in Github|
|sdps||<Vitis Install Directory>/data/embedded/XilinxProcessorIPLib/drivers/sdps||https://github.com/Xilinx/embeddedsw/tree/master/XilinxProcessorIPLib/drivers/sdps/|
Note: To view the sources for a particular release, use the rel-version tag in github. For example, for the 2020.1 release, the proper version of the code is: https://github.com/Xilinx/embeddedsw/tree/xilinx-v2020.1/XilinxProcessorIPLib/drivers/sdps
The driver source code is organized into different folders. The table below shows the sdps driver source organization.
Provides the API and data structure details
Driver .tcl and .mdd file
Example applications that show how to use the driver features
Driver source files
SD Card interface
• Host clock rate variable between 0 and 208 MHz
• Up to 832Mbits per second data rate using 4 parallel data lines (SDR104 mode)
• Transfers the data in 1 bit and 4 bit SD modes
• Transfers the data in SDR104, SDR50, DDR50, SDR25, SDR12 modes.
eMMC card interface
• Transfers the data in 1 bit, 4 bit and 8 bit modes.
Known issues and Limitations
- Driver supports only polled mode.
Refer to the driver examples directory for various example applications that exercise the different features of the driver. Each application is linked in the table below. The following sections describe the usage and expected output of the various applications. These example applications can be imported into the Vitis IDE from the Board Support Package settings tab.
Links to Examples
|Read and Write example without file system||This examples does basic raw read and write test from SD/eMMC device in Polled mode.|
|Read and Write example with file system (using XILFFS library)||This examples does basic file system read and write test from SD/eMMC device in Polled mode.|
Example Application Usage
SDPS Read and Write example without file system
This examples does basic raw read and write test from SD/eMMC device in Polled mode.
Read and Write example with file system (using XILFFS library)
This examples does basic file system read and write test from SD/eMMC device in Polled mode.
Example Design Architecture
PerformanceSD card : Sandisk Ultra 16GB SDHC card
|High speed||20.54 MB/sec|
|High Speed||19.4 MB/Sec|