AT49F040B ATMEL [ATMEL Corporation], AT49F040B Datasheet - Page 6

• Manufacturer Part Number: AT49F040B
• Description: 4-megabit (512K x 8) 5-volt Only Flash Memory
• Manufacturer: ATMEL [ATMEL Corporation]

6
Figure 4-1.
Notes:
NO
1. VA = Valid address for programming. During a sector
2. I/O7 should be rechecked even if I/O5 = “1” because
AT49F040B
erase operation, a valid address is any sector
address within the sector being erased. During chip
erase, a valid address is any non-protected sector
address.
I/O7 may change simultaneously with I/O5.
Successful, Write
Read I/O7 - I/O0
Read I/O7 - I/O0
Program/Erase
Operation Not
Exit Command
I/O7 = Data?
Data Polling Algorithm
Product ID
I/O7 = Data?
Addr = VA
Addr = VA
I/O5 = 1?
START
NO
YES
NO
YES
YES
Program/Erase
Successful,
Read Mode
Operation
Device in
Figure 4-2.
Note:
NO
1. The system should recheck the toggle bit even if
I/O5 = “1” because the toggle bit may stop toggling
as I/O5 changes to “1”.
Successful, Write
Read I/O7 - I/O0
Read I/O7 - I/O0
Read I/O7 - I/O0
Program/Erase
Exit Command
Toggle Bit Algorithm
Operation Not
Toggle Bit =
Toggle Bit =
Product ID
I/O5 = 1?
Toggle?
Toggle?
START
Twice
YES
YES
YES
NO
NO
Successful, Device
Program/Erase
in Read Mode
Operation
3606A–FLASH–12/05