AT49F040B 查看數據表（PDF） - Atmel Corporation

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AT49F040B

4-megabit (512K x 8) 5-volt Only Flash Memory

Atmel Corporation 

Figure 4-1. Data Polling Algorithm

START

Figure 4-2. Toggle Bit Algorithm

START

Read I/O7 - I/O0

Addr = VA

I/O7 = Data?

YES

Read I/O7 - I/O0

Read I/O7 - I/O0

Toggle Bit =

NO

NO

Toggle?

NO

I/O5 = 1?

YES

YES

NO

I/O5 = 1?

Read I/O7 - I/O0

Addr = VA

YES

Read I/O7 - I/O0

Twice

I/O7 = Data?

YES

NO

Program/Erase

Operation Not

Successful, Write

Product ID

Exit Command

Program/Erase

Operation

Successful,

Device in

Read Mode

Notes:

1. VA = Valid address for programming. During a sector

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.

2. I/O7 should be rechecked even if I/O5 = “1” because

I/O7 may change simultaneously with I/O5.

Note:

Toggle Bit =

NO

Toggle?

YES

Program/Erase

Operation Not

Successful, Write

Product ID

Exit Command

Program/Erase

Operation

Successful, Device

in Read Mode

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”.

6 AT49F040B

3606A–FLASH–12/05

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