GD25D20C / GigaDevice Semiconductor (Beijing) Inc.

GD25D20C Datasheet with Chat AI

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Part No.	GD25D20C
Manufacturer	GIGADEVICE
Size	830 Kbytes
Pages	43 pages
Description	3.3V Uniform Sector Standard and Dual Serial Flash

Datasheet Summary with AI

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.

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