ONFI 4.2 NAND Flash Controller
The NAND Flash landscape is changing and the Arasan NAND Flash Controller IP Core is changing in accordance with it. New applications are emerging and innovative IP solutions are needed to keep pace. NAND Flash is being incorporated into all types of products including Portable memory drives, Media players, Digital cameras, Smartphones, eBook Readers, Tablets, Digital TVs, Digital camcorders, PCs, and so on. Arasan is in the perfect position to give you what you need.
The Arasan NAND Flash Controller IP Core is a full-featured, easy to use, synthesizable core, easily integrated into any SoC or FPGA development. Designed to support SLC, MLC and TLC flash memories, it is flexible in use and easy in implementation. The controller works with any suitable NAND Flash memory device up to 1024Gb from leading memory providers – Micron, Samsung, Toshiba and Hynix. The IP core includes a host of configuration options from page size to bank selects. The controller offers BCH Error Code Correction (ECC), with options for either correcting 4b, 8b, 12b, or 16b per 512 Bytes, or 24b, 32b, or even 60b per 1024 Bytes, for long term reliability.
The IP core supports the Open NAND Flash Interface Working Group (ONFI) 4.2 standards. The design has been built around a modern bus architecture, supporting both AXI3 and AXI4. Bridges may be used to provide support for other host bus interfaces if required. The slave AXI IP supports an external DMA interface where the master AXI incorporates an internal DMA controller.
The Arasan NAND Flash Controller IP Cores are delivered in Verilog RTL that can be implemented in an ASIC or FPGA. They are fully tested with vendor models and hardware is tested with FPGA’s. The core includes RTL code, test scripts and a test environment for complete simulation and verification.
NAND Flash Interface
Arasan Chip System’s NAND ﬂash controller IP provides easy, reliable access to an oﬀ-chip NAND ﬂash. It is backwards compatible, supporting the Single Data Rate (asynchronous) mode, the original Double Data Rate (synchronous) mode, as well as the newest and highest speed NVDDR3 mode. All data rates from all modes are supported.
The IP consists of two primary components: a host controller and a high speed PHY. The host controller is controlled via an AXI slave port. A scatter/gather DMA provides a separate AXI master port, allowing for extended unattended reads or writes. The host controller supports either AXI3 or AXI4, and a user conﬁgurable data path width.
AXI Control Interface
The primary interface to the ONFI controller is an AXI slave interface. This is a full AXI interface, whether AXIv3 or AXIv4, offering access to both control registers and an external SRAM staging area. The staging area is used to make sure transfers never need to be interrupted, either when reading or writing to the flash, and it supports high speed AXI bus access such as might be used by either the internal DMA or an external DMA. The AXI data width is also fully configurable, allowing the user better control of any area versus throughput tradeoffs when transferring to and from the host environment.
AXI DMA Interface
An integrated DMA controller provides for a hands-off, memory-copy like interface. This can be used to transfer data to or from the device at high speed. Moreover, the DMA supports a parallelism option, allowing transfers to automatically be parallelized to the various hardware components in an ONFI device.
This support has been simplified to the level of a CPU memory copy request, requiring a bare minimum of software to transfer small or large amounts of data to or from the flash. Indeed, this parallelization feature can massively improve the throughput of any DMA transfer.