Datasheet > 29W040

29W040

更新时间： 2022-11-25 16:17:13

品牌	Logo	应用领域
意法半导体 - STMICROELECTRONICS		闪存
页数	文件大小	规格书
31页	206K
描述
4 Mbit 512Kb x8, Uniform Block Low Voltage Single Supply Flash Memory

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29W040 数据手册

M29W040

Figure 3. Memory Map and Block Address Table

TOP

BOTTOM

ADDRESS ADDRESS

A18

A17

A16

64K Bytes Block

7FFFFh

6FFFFh

5FFFFh

4FFFFh

3FFFFh

2FFFFh

1FFFFh

0FFFFh

70000h

60000h

50000h

40000h

30000h

20000h

10000h

00000h

64K Bytes Block

AI01362B

Table 7. Commands

Block Protection. Each uniform block can be

separately protected against Program or Erase.

Block Protectionprovides additionaldata security,

as it disables all programor erase operations.This

mode is activated when both A9 and G are set to

V_IDand the block address is applied on A16-A18.

Block Protection is programmed using a Presto F

programlike algorithm.Protectionisinitiatedon the

Hex Code

10h

Command

Chip Erase Confirm

Power Down

20h

30h

Block Erase Resume/Confirm

Reserved

edge ofW fallingto V .Thenafteradelayof100µs,

50h

the edge of W rising to V_IHends the protection

operation.Protection verify is achieved by bringing

G, E andA6 to V_ILwhile W is at V_IHand A9 at V_ID.

Undertheseconditions,readingthe dataoutputwill

yield 01h if the block defined by the inputs on

A16-A18 is protected. Any attempt to program or

erase a protected block will be ignored by the

device.

Any protected block can be unprotected to allow

updating of bit contents. All blocks must be pro-

tected before an unprotect operation. Block Un-

protect is activated when A9, G and E are at V_ID.

The addressesinputs A6, A12, A16 mustbe main-

tainedatV_IH. BlockUnprotectis performedthrough

a Presto F Erase like algorithm. Unprotect is initi-

ated by the edge of W falling to V_IL. After a delay

of 10ms, the edge of W rising to V_IHwill end the

unprotection operation. Unprotect verify is

achieved by bringing G and E to V_ILwhile A6 and

80h

Set-up Erase

Read Electronic Signature/

Block Protection Status

90h

A0h

B0h

F0h

Program

Erase Suspend

Read Array/Reset

W are at V_IHand A9 at V_ID. In these conditions,

reading the output data will yield 00h if the block

defined by the inputs on A16-A18 has been suc-

cessfullyunprotected.AllcombinationsofA16-A18

must be addressedin orderto ensurethatall of the

8 uniform blocks have been unprotected. Block

Protection Status is shown in Table 5.

7/31

1...4 5 678 9 10...31

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