NAND Flash Memory Controller with DMA

 

Introduction    
NANDFCTRL2 is a VHDL IP core implementing an interface to NAND flash memory devices. The core supports ONFI 4.0 and provides DMA transfers to and from the memory. The core implements a BCH EDAC with capability of correcting 60 errors per chunks of 1024 bytes of data. The actual error correction capability is configured by means of VHDL generics, in conjunction with the configuration of memory support. The EDAC can be combined with a data randomizer, which breaks any repetetive bit patterns, thereby increasing memory endurance. Both the EDAC and the Randomizer can be bypassed during runtime if the user needs to access the memory without them. To support detection and recovery from SEFI, the core provides timeout functions in addtion to the EDAC. The SEFI detection functionality monitors ongoing accesses towards the flash to detect if any access is too long, which could indicate an error in the memory.  
For details about the actual flash memory interface, flash memory architecture and ONFI 4.0 command set please refer to the Open NAND Flash Interface specification, revision 4.0.

     

The NAND Flash controller has the following features:

  • ONFI 4.0 support
    • All mandatory ONFI 4.0 commands
    • Asynchronous / SDR data interface timing mode 1-5
  • BCH EDAC with up to 60 bits correction capacity per 1024 bytes chunks of data
  • Randomization of memory data
  • Basic timeout based SEFI detection and reporting
  Availability

NANDFCTRL2 is part of the GRLIB IP Library from April 2022 and can be licensed as a separate add-on. The current version of the core is suitable for FPGA implementations for evaluation purposes. Additional features for the NANDFCTRL2 IP core will become available as part of milestone releases. The table below shows the planned milestones. Please note that the future milestone features and dates are tentative.

 

 Milestone  Description  Target users  Date
 Release 1.5  Release 1.5 adds improved software interface and Linux driver:
  • Improved DMA engine with support for descriptor tables in memory
  • Updated software interface
  • Optional bad block marker preservation
  • Updated SEFI detection and management
  • EDAC performance improvements
User's that wants to evaluate NAND flash memories in FPGA platforms  2022-Jun
 Release 2  Release 2 adds synchronous interface and general improvements:
  • NV-DDR2 & NV-DDR3 support for Xilinx Ultrascale
  • Support for all mandatory SLC, SDR and DDR commands
  • Timing modes 6-9
  • FT features
User's that wants to evaluate/prototype NAND flash memories in FPGA platforms  2022-Dec
 Release 3  Release 3 adds MLC, TLC modes and additional improvements:
  • MLC and TLC modes
  • NV-DDR2 & NV-DDR3 support for Microsemi Polarfire 
  • Support for all data interfaces in SLC, MLC and TLC mode
  • All timing modes, 0-9, for SDR and DDR
  • LDPC ECC for supporting TLC mode
  • ASIC implementation support
User's that wants to include NAND flash memories in industrial applications   2023-Jun

  

Example bitstreams are available for evaluation for Xilinx Kintex UltraScale FPGA KCU105 Evaluation Kit and Alpha Data ADA-SDEV-KIT3. To get access to evaluation bitstreams, contact This email address is being protected from spambots. You need JavaScript enabled to view it..

The bitstreams have been tested with UT81NDQ512G8T from CAES and 69F256G16 from DDC.

 

Documentation 

 Document  File
 NANDFCTRL2 IP Core User's Manual  nandfctrl2.pdf (April 2022)