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1300 Henley Court Pullman, WA 99163 509.334.6306 www.digilentinc.com Pmod SF3 Board Reference Manual Revised October 5, 2016 This manual applies to the Pmod SF3 rev. A Overview The Digilent Pmod SF3 (Revision A) provides 32MB of serial Flash Memory. Features:       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 The Pmod SF3. 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. DOC#: 510-340 Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners. Page 1 of 2 Pmod SF3 Reference Manual Users that wish to simply use the memory module without concerning themselves with the dual/quad input and output communication may use the example code and tutorials found on the Pmod SF3 Resource Center. 3 Pinout Description Table Pin Signal Description Pin Signal Description 1 ~CS Chip Select 7 NC Not Connected 2 MOSI/DQ0 Master-Out-Slave-In 8 NC Not Connected 3 MISO/DQ1 Master-In-Slave-Out 9 W/DQ2 Write Protect 4 SCK Serial Clock 10 HLD/DQ3 Hold 5 GND Power Supply Ground 11 GND Power Supply Ground 6 VCC Power Supply (3.3V) 12 VCC Power Supply (3.3V) Any external power applied to the Pmod SF3 must be within 2.31V and 3.7V; it is strongly recommended the Pmod is operated at 3.3V. Bottom of Form 4 Physical Dimensions The pins on the pin header are spaced 100 mil apart. The PCB is 1 inch long on the sides parallel to the pins on the pin header and 0.8 inches long on the sides perpendicular to the pin header. Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners. Page 2 of 2