M29DW128F datasheet(37/93 Pages) STMICROELECTRONICS

37 / 93 page

M29DW128F

6 Command Interface

37/93

Table 14.

Fast Program Commands, 16-bit Mode

6.3

Block Protection commands

Blocks or groups of blocks can be protected against accidental program, erase or read

operations. The Protection Groups are shown in Appendix A, Table 34: Block Addresses and

Protection Groups. The device block protection scheme is shown in Figure 7: Software

Protection Scheme and Figure 6: Block Protection State Diagram. See either Table 15, or

Table 16, depending on the configuration that is being used, for a summary of the Block

Protection commands.

Only the commands related to the Extended Block Protection are available in both 8 bit and 16

bit memory configuration. The other block protection commands are available in 16-bit

configuration only.

6.3.1

Enter Extended Block command

The M29DW128F has one extra 256-Byte block (Extended Block) that can only be accessed

using the Enter Extended Block command.

Three Bus Write cycles are required to issue the Extended Block command. Once the

command has been issued the device enters the Extended Block mode where all Bus Read or

Program operations are conducted on the Extended Block. Once the device is in the Extended

Block mode, the Extended Block is addressed by using the addresses occupied by the boot

blocks in the other operating modes (see Table 34: Block Addresses and Protection Groups).

The device remains in Extended Block mode until the Exit Extended Block command is issued

or power is removed from the device. After power-up or a hardware reset, the device reverts to

Command

Bus Write Operations(1)

X Don’t Care, PA Program Address, PD Program Data, BA Any address in the Block, BKA Bank Address, WBL Write

Buffer Location. All values in the table are in hexadecimal.

1st

2nd

3rd

4th

5th

6th

Add

Data

Add

Data

Add

Data

Add

Data

Add

Data

Add

Data

Write to Buffer and Program

N+

555

2AA

N(2)

The maximum number of cycles in the command sequence is 37. N+1 is the number of Words to be programmed during

the Write to Buffer and Program operation.

PA(3)

Each buffer has the same A5-A22 addresses. A0-A4 are used to select a Word within the N+1 Word page.

WBL

(4)

The 6th cycle has to be issued N time. WBL scans the Word inside the page.

Write to Buffer and Program Abort and

Reset

555

2AA

555

Write to Buffer and Program Confirm

BA(5)

BA must be identical to the address loaded during the Write to buffer and Program 3rd and 4th cycles.

Double Word Program

555

PA0

PD0

PA1

PD1

Quadruple Word Program

555

PA0

PD0

PA1

PD1

PA2

PD2

PA3

PD3

Unlock Bypass

555

2AA

555

Unlock Bypass Program

Unlock Bypass Reset

M29DW128F Datasheet(PDF) 37 Page - STMicroelectronics

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