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Part No.GD25D20CEJG
MfrGIGADEVICE
Size830 Kbytes
Pages43 pages
Description3.3V Uniform Sector Standard and Dual Serial Flash
Datasheet SummaryAI
1. Device Overview:

️· Type: SPI Flash Memory
️· Models: GD25D40C and GD25D20C (slight differences in ID definitions - see below)
️· Purpose: Designed for data storage in embedded systems.

2. Core Concepts & Registers

️· Write Enable Latch (WEL): Must be set to 1 before programming/erasing. Set by WREN (06H), cleared by WRDI (04H) and automatically reset after WRSR.
️· Status Register: Contains information about the device's status, including the Write In Progress (WIP) bit. Read by RDSR (05H), some bits modified by WRSR (01H).
️· Write In Progress (WIP): Indicates whether a programming or erasing operation is in progress.
️· Block Protect (BP2, BP1, BP0): These bits determine the size of the read-only area (specifics not fully described but configurable via WRSR).
️· Status Register Protect (SRP): Used in conjunction with the Write Protect (WP#) signal to control access (Hardware Protection Mode).
️· Hardware Protection Mode (HPM): A mode that restricts write operations, enabled by SRP and WP#.

3. Command Summary (Hex Codes and Functionality):

Command (Hex) Functionality Notes
06H (WREN) Write Enable: Sets the WEL latch to 1. Required before programming or erasing.
04H (WRDI) Write Disable: Resets the WEL latch to 1.
05H (RDSR) Read Status Register: Reads the Status Register.
01H (WRSR) Write Status Register: Modifies the Status Register. Requires WEL to be set. Affects BP bits and SRP. Not executable in HPM.
03H (READ) Read Data Bytes: Reads data from memory. Incrementing address after each byte read.
0BH (READS) Read Data Bytes at Higher Speed: Reads data rapidly. Uses a dummy byte. Incrementing address after each byte read.
ABH Release From Deep Power-Down & Read Device ID
90H Manufacturer/Device ID
9FH Read Identification
4BH Read Unique ID

4. ID Definitions (Differences between GD25D40C and GD25D20C):

Operation Code M7-M0 (GD25D40C) ID15-ID8 (GD25D40C) ID7-ID0 (GD25D40C) M7-M0 (GD25D20C) ID15-ID8 (GD25D20C) ID7-ID0 (GD25D20C)
9FH C8 40 13 C8 40 12
90H C8 12 C8 11
ABH 12 11

Key Takeaways:

️· SPI Interface: This is an SPI device, so it uses chip select (CS#), data input (DI), data output (DO), and clock (SCK) signals.
️· Timing: The document refers to specific timing parameters (fR, fC, tW) that would be important for hardware implementation.
️· Protection: Offers various protection mechanisms to prevent unauthorized writes.
️· ID Codes: Device identification codes (MID, DID) are provided to allow software to identify the specific flash memory chip.
GD25D20CEJG Datasheet with Chat AI
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    Hello, Please ask a question about GD25D20CEJG Datasheet.
    Example questions: ➤ Describe the hardware protected mode (hpm) and how it's activated, and explain what happens if a write status register (wrsr) command is issued while in hpm.➤ Explain the difference between the 'read data bytes' (03h) and 'read data bytes at higher speed' (0bh) commands, specifically focusing on the inclusion of a 'dummy byte'.➤ What must be done *before* issuing a page program, sector erase, block erase, chip erase, or write status register command?
    • Datasheet Details
    Part No.GD25D20CEJG
    ManufacturerGIGADEVICE
    Size830 Kbytes
    Pages43 pages
    Description3.3V Uniform Sector Standard and Dual Serial Flash
    Datasheet Summary AI Expand summary
    1. Device Overview:

    ️· Type: SPI Flash Memory
    ️· Models: GD25D40C and GD25D20C (slight differences in ID definitions - see below)
    ️· Purpose: Designed for data storage in embedded systems.

    2. Core Concepts & Registers

    ️· Write Enable Latch (WEL): Must be set to 1 before programming/erasing. Set by WREN (06H), cleared by WRDI (04H) and automatically reset after WRSR.
    ️· Status Register: Contains information about the device's status, including the Write In Progress (WIP) bit. Read by RDSR (05H), some bits modified by WRSR (01H).
    ️· Write In Progress (WIP): Indicates whether a programming or erasing operation is in progress.
    ️· Block Protect (BP2, BP1, BP0): These bits determine the size of the read-only area (specifics not fully described but configurable via WRSR).
    ️· Status Register Protect (SRP): Used in conjunction with the Write Protect (WP#) signal to control access (Hardware Protection Mode).
    ️· Hardware Protection Mode (HPM): A mode that restricts write operations, enabled by SRP and WP#.

    3. Command Summary (Hex Codes and Functionality):

    Command (Hex) Functionality Notes
    06H (WREN) Write Enable: Sets the WEL latch to 1. Required before programming or erasing.
    04H (WRDI) Write Disable: Resets the WEL latch to 1.
    05H (RDSR) Read Status Register: Reads the Status Register.
    01H (WRSR) Write Status Register: Modifies the Status Register. Requires WEL to be set. Affects BP bits and SRP. Not executable in HPM.
    03H (READ) Read Data Bytes: Reads data from memory. Incrementing address after each byte read.
    0BH (READS) Read Data Bytes at Higher Speed: Reads data rapidly. Uses a dummy byte. Incrementing address after each byte read.
    ABH Release From Deep Power-Down & Read Device ID
    90H Manufacturer/Device ID
    9FH Read Identification
    4BH Read Unique ID

    4. ID Definitions (Differences between GD25D40C and GD25D20C):

    Operation Code M7-M0 (GD25D40C) ID15-ID8 (GD25D40C) ID7-ID0 (GD25D40C) M7-M0 (GD25D20C) ID15-ID8 (GD25D20C) ID7-ID0 (GD25D20C)
    9FH C8 40 13 C8 40 12
    90H C8 12 C8 11
    ABH 12 11

    Key Takeaways:

    ️· SPI Interface: This is an SPI device, so it uses chip select (CS#), data input (DI), data output (DO), and clock (SCK) signals.
    ️· Timing: The document refers to specific timing parameters (fR, fC, tW) that would be important for hardware implementation.
    ️· Protection: Offers various protection mechanisms to prevent unauthorized writes.
    ️· ID Codes: Device identification codes (MID, DID) are provided to allow software to identify the specific flash memory chip.