410-103P-KIT Digilent

1300 Henley Court Pullman, WA 99163 509.334.6306 www.digilentinc.com PmodSF Reference Manual Revised May 24, 2016 This manual applies to the PmodSF rev. C Overview The PmodSF provides users with 16Mbit of non-volatile memory through the use of ST Microelectronics M25P16. By using the SPI protocol, users can both write to and read from the flash memory. Features include: 16Mbit serial Flash memory Data retention greater than 20 years Small PCB size for flexible designs 1.0 20/8 (2.5 cm 2.0 cm) 6-pin Pmod connector with SPI interface Follows Digilent Interface Specification Type 2 Library and example code available in resource center The PmodSF. 1 Functional Description The PmodSF utilizes ST Microelectronics M25P16 which provides 16 Mbits of flash memory that can be accessed through the SPI protocol. Although this amount of memory is very small compared to modern flash drives, the PmodSF is a great way to get introduced to controlling non-volatile memory and can be easily incorporated into projects that need a way to store some information without using the USB interface. 2 Interfacing with the Pmod The PmodSF communicates with the host board via the SPI protocol. By bringing the Chip Select (CS) line low, users are able to issue a variety of read, write, and erase commands to the memory chip. A table of the available commands for the M25P16 from its respective datasheet is provided below: Copyright Digilent, Inc. All rights reserved. DOC : 502-103 Page 1 of 2 Other product and company names mentioned may be trademarks of their respective owners. PmodSF Reference Manual One-Byte Number of Number of Number of Data Instruction Description Instruction Address Bytes Dummy Bytes Bytes Code WREN Write Enable 0x06 0 0 0 WRDI Write Disable 0x04 0 0 0 RDID Read Identification 0x9F 0 0 1 to 3 Read Status RDSR 0x05 0 0 1 to Register Write Status WRSR 0x01 0 0 1 Register READ Read Data Bytes 0x03 3 0 1 to Read Data Bytes at FAST READ 0x0B 3 1 1 to Higher Speed PP Page Program 0x02 3 0 1 to 256 SE Sector Erase 0xD8 3 0 0 BE Bulk Erase 0xC7 0 0 0 DP Deep Power-down 0xB9 0 0 0 Release from DP and Read Electronic 0 3 1 to Signature RES 0xAB Release from DP 0 0 0 The address bits range from 0x000000 to 0x1FFFFF, with the first two hexadecimal bits indicating which memory sector the data is located in. Thankfully, users do not have to explicitly worry about writing to and reading from the memory module, as there is a library that takes care of these commands for us. Pin Signal Description 1 ~CS Chip Select 2 MOSI Master-Out-Slave-In 3 MISO Master-In-Slave-Out 4 SCK Serial Clock 5 GND Power Supply Ground 6 VCC Positive Power Supply (3.3V) Any external power applied to the PmodSF must be within 2.7V and 3.6V it is recommended that the Pmod is operated at 3.3V. 2 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. Page 2 of 2 Other product and company names mentioned may be trademarks of their respective owners.