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Overview
The Digilent Pmod SF3 (Revision A) provides 32MB of serial Flash Memory.
1 Functional Description
The Pmod SF3 utilizes Micron's NOR Flash memory (N25Q256A) to provide easily accessed non-volatile memory to
system boards. The data sheet can be found here.
2 Interfacing with the Pmod
The Pmod SF3 communicates with the host board via the SPI protocol. By bringing the Chip Select line logic level
low voltage, users may issue a single byte instruction code to memory chip. A table of available commands can be
found in the data sheet for the N25Q256A here starting on page 28.
The memory is byte-addressed with the range of 0x000000 to 0x1FFFFFF and is organized into 256 byte pages, 4 KB
subsectors, and 64 KB sectors. The memory is written by using an Erase-Program cycle. The smallest
programmable unit is one page and the smallest erasable unit is 1 subsector.
32MB serial NOR Flash Memory
Supports extended SPI Protocol, Dual I/O, and
Quad I/O
Minimum 100,000 ERASE cycles per sector
More than 20 years data retention
12-pin Pmod connector with SPI interface
Follows Digilent Interface Specification Type 2A
