| Table of Contents |
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Introduction
The static memory controller (SMC) can be used either as a NAND flash controller or a parallel port memory controller supporting the following memory types:
• NAND flash
• Asynchronous SRAM
• NOR flash
The operational registers of the SMC are configured through an APB interface. The SMC handles all commands, addresses, data, and the memory device protocols. It allows the users to access the controller by reading or writing into the operational registers. The SMC is based on Arm's PL353 static memory controller.
Driver Sources
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 in Vitis | Path in Github |
|---|---|---|
| nandps | <Vitis Install Directory>/data/embedded/XilinxProcessorIPLib/drivers/nandps | https://github.com/Xilinx/embeddedsw/tree/master/XilinxProcessorIPLib/drivers/nandps |
| Info |
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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/nandps |
The driver source code is organized into different folders. The table below shows the nandps driver source organization.
Directory | Description |
|---|---|
doc | Provides the API and data structure details |
data | Driver .tcl and .mdd file |
examples | Example applications that show how to use the driver features |
| src | Driver source files |
Driver Implementation
For a full list of features supported by this IP, please refer Chapter 11: Static Memory Controller in Zynq TRM.
Features
- ONFI 1.0 compatible
- upto 1GB device
- 8/16-bit IO width with a single chip select
- 16-word read/write FIFOs
- 8-word command FIFO
- Programmable IO Cycle timing
- 1-bit ECC hardware with sw assist
- Asynchronous memory operating mode
- Supports only the mandatory ONFI 1.0 commands. i.e Reset, Read status, Read ID, Read Parameter Page, Read Page, Program Page, Erase Block, Set/Get Features
- supports page cache read operations
- Support BBT management
- Support for ondie ecc devices
Known issues and Limitations
- Driver supports polled mode only
- No support for interleaved and optional 1.0 commands
Supported Flash vendors
- Micron
Example Applications
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
Examples Path:
| Test Name | Example Source | Description |
|---|---|---|
| NANDPS Example | xnandps_example.c | his examples does basic read and write test from the NAND flash device |
| NANDPS Cache Example | xnandps_cache_example.c | This example tests Page cache read & write command on NAND Flash Device. |
| NANDPS Skip Block Example | xnandps_skip_example.c | This example tests the skip block method of erase/read/write operation on NAND Flash Device. |
Example Application Usage
NANDPS Example
This examples does basic read and write test from the NAND flash device.
Nand Flash Read Write Example Test Successfully ran Nand Flash Read Write Example Test |
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NANDPS Cache Example
This example tests Page cache read & write command on NAND Flash Device.
Nand Flash Read Write Example Test Successfully ran Nand Flash Read Write Example Test |
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NANDPS Skip Block Example
This example tests the skip block method of erase/read/write operation on NAND Flash Device
Nand Flash Skip Block Method Example Test Successfully ran Nand Flash Skip Block Method Example Test |
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Example Design Architecture
NA
Performance
| Write(mbps) | Read(mbps) |
|---|---|
| 7.1 | 13.8 |
Change Log
2021.2
None
2021.1
https://github.com/Xilinx/embeddedsw/blob/xilinx_v2021.1/doc/ChangeLog#L451
2020.2
https://github.com/Xilinx/embeddedsw/blob/xilinx-v2020.2/doc/ChangeLog#L633
2020.1
https://github.com/Xilinx/embeddedsw/blob/xilinx-v2020.1/doc/ChangeLog#L503
2019.2
https://github.com/Xilinx/embeddedsw/blob/xilinx-v2019.2/doc/ChangeLog#L1954
2019.1
https://github.com/Xilinx/embeddedsw/blob/xilinx-v2019.1/doc/ChangeLog#L1715