User guide
Table Of Contents
- Features
- 1. Description
- 2. Pin Configurations and Pinouts
- 3. Block Diagram
- 4. Memory Array
- 5. Device Operation
- 6. Read Commands
- 7. Program and Erase Commands
- 8. Sector Protection
- 9. Hardware Controlled Protection
- 10. Security Features
- 11. Additional Commands
- 12. Deep Power-down
- 13. “Power of 2” Binary Page Size Option
- 14. Manufacturer and Device ID Read
- 15. Command Tables
- 16. Power-on/Reset State
- 17. System Considerations
- 18. Electrical Specifications
- 19. Input Test Waveforms and Measurement Levels
- 20. Output Test Load
- 21. AC Waveforms
- 21.1 Waveform 1 – SPI Mode 0 Compatible (for Frequencies up to 66MHz)
- 21.2 Waveform 2 – SPI Mode 3 Compatible (for Frequencies up to 66MHz)
- 21.3 Waveform 3 – RapidS Mode 0 (FMAX = 66MHz)
- 21.4 Waveform 4 – RapidS Mode 3 (FMAX = 66MHz)
- 21.5 Utilizing the RapidS Function
- 21.6 Reset Timing
- 21.7 Command Sequence for Read/Write Operations for Page Size 256-Bytes (Except Status Register Read, Manufacturer and Device ID Read)
- 21.8 Command Sequence for Read/Write Operations for Page Size 264-Bytes (Except Status Register Read, Manufacturer and Device ID Read)
- 22. Write Operations
- 23. Read Operations
- 24. Detailed Bit-level Read Waveform – RapidS Serial Interface Mode 0/Mode 3
- 24.1 Continuous Array Read (Legacy Opcode E8H)
- 24.2 Continuous Array Read (Opcode 0BH)
- 24.3 Continuous Array Read (Low Frequency: Opcode 03H)
- 24.4 Main Memory Page Read (Opcode: D2H)
- 24.5 Buffer Read (Opcode D4H or D6H)
- 24.6 Buffer Read (Low Frequency: Opcode D1H or D3H)
- 24.7 Read Sector Protection Register (Opcode 32H)
- 24.8 Read Sector Lockdown Register (Opcode 35H)
- 24.9 Read Security Register (Opcode 77H)
- 24.10 Status Register Read (Opcode D7H)
- 24.11 Manufacturer and Device Read (Opcode 9FH)
- 25. Auto Page Rewrite Flowchart
- 26. Ordering Information
- 27. Packaging Information
- 28. Revision History
- 29. Errata
40
3596N–DFLASH–11/2012
AT45DB081D
23. Read Operations
The following block diagram and waveforms illustrate the various read sequences available.
23.1 Main Memory Page Read
23.2 Main Memory Page to Buffer Transfer (Data from Flash Page Read into Buffer)
FLASH MEMORY ARRAY
PAGE (256-/264-BYTES)
BUFFER 2 (256-/264-BYTES)BUFFER 1 (256-/264-BYTES)
I/O INTERFACE
MAIN MEMORY
PAGE TO
BUFFER 1
MAIN MEMORY
PAGE TO
BUFFER 2
MAIN MEMORY
PAGE READ
BUFFER 1
READ
BUFFER 2
READ
SO
SI (INPUT)
CMD
PA11-7
PA6-0, BA8
X
CS
n n+1
SO (OUTPUT)
BA7-0
4 Dummy Bytes for Serial
X
ADDRESS FOR BINARY PAGE SIZE
A19-A16
A15-A8
A7-A0
Starts reading page data into buffer
SI (INPUT)
CMD
PA11-7
PA6-0, X
CS
SO (OUTPUT)
XXXX XXXX
BINARY PAGE SIZE
A19-A8 + 8 DON'T CARE BITS