ONFI Controller Flash Translation Layer (FTL) is a small footprint, high performance NAND Flash data manager to support sector based file systems (FAT, NTFS, etc.) to operate Single Level Cell (SLC) and Multi Level Cell (MLC) NAND Flash devices like any other block storage device. It makes the NAND Flash device appear to the system as a disk drive. FTL supports bad block management, wear leveling, power-fail recovery and garbage collection features for higher performance of the NAND Flash devices. The document also gives the performance numbers achieved on hardware.

1. ONFI Controller
Flash Translation Layer
ONFI Controller Flash Translation Layer (FTL) is a small footprint, high performance NAND Flash data manager to support sector based file systems
(FAT, NTFS, etc.) to operate Single Level Cell (SLC) and Multi Level Cell (MLC) NAND Flash devices like any other block storage device. It makes the
NAND Flash device appear to the system as a disk drive.
FTL supports bad block management, wear leveling, power-fail recovery and garbage collection features for higher performance of the NAND Flash
devices.
Architecture Features
■ Written in ANCI C
■ Supports SLC and MLC NAND Flash Devices
■ Supports small and large page size
■ Supports bad block management
■ Fast and automatic garbage collection
■ Power-fail recovery
■ Wear leveling
■ Simple API offers very easy way to build flash-based storage
device
■ Optimized performance and reliability for limited resources MCUs/
DSPs
■ RAM and ROM resources usage highly scalable by configurable
feature
Benefits
■ Processor and RTOS independent
■ Supports most types of NAND Flash Devices
■ Easy to understand and implement APIs
■ Integrated and tested with SLS ONFI Controller IP Core
■ Small code footprint
■ High Performance
Performance Report for ONFI Controller IP Core for Single Channel and Dual Channel Operation
SLS USB3.0 Development board and SLS ONFI 2.0 HSMC snap on board are used to measure the performance of ONFI Controller IP Core. On
these boards we carried out a read/write operation as standalone memory, with FTL and as mass storage device using mass storage application.
The graphs below give information on the Read (R) and Write (W) operation using the ONFI 2.0 Controller IP Core in two different configurations- Sin-
gle Channel Single Chip and Dual Channel Two Chips. The Single Channel Single Chip means the performance measured on single device. Dual
Channel Two Chips means the performance measured on single device per channel simultaneously.
R - Read Speed
W - Write Speed
Normal - Legacy Read/Write Command
Interleave - Multiple Plane Read/Write command is
used to increase the throughput
Standalone - Read/Write Raw Data
With FTL - Read/Write Raw Data using FTL
With Mass Storage - Read/Write Mass
Storage application data
The performance is measured on SLC NAND Flash device having 4K page size in Device mode 4 (83MHz-166MT/s) using Source Synchronous
interface.
System Level Solutions
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E-mail: info@slscorp.com • Website: www.slscorp.com
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