M29W040 datasheet(7/31 Pages) STMICROELECTRONICS

7 / 31 page

64K Bytes Block

AI01362B

7FFFFh

6FFFFh

5FFFFh

4FFFFh

3FFFFh

2FFFFh

1FFFFh

0FFFFh

TOP

ADDRESS

70000h

60000h

50000h

40000h

30000h

20000h

10000h

00000h

BOTTOM

ADDRESS

A18

64K Bytes Block

A17

A16

Figure 3. Memory Map and Block Address Table

Hex Code

Command

10h

Chip Erase Confirm

20h

Power Down

30h

Block Erase Resume/Confirm

50h

Reserved

80h

Set-up Erase

90h

Read Electronic Signature/

Block Protection Status

A0h

Program

B0h

Erase Suspend

F0h

Read Array/Reset

Table 7. Commands

Block Protection. Each uniform block can be

separately protected against Program or Erase.

Block Protection provides additional data security,

as it disables all program or erase operations. This

mode is activated when both A9 and G are set to

VID and the block address is applied on A16-A18.

Block Protection is programmed using a Presto F

program like algorithm. Protection is initiated on the

edge of W falling to VIL. Then after a delayof 100

µs,

the edge of W rising to VIH ends the protection

operation. Protection verify is achieved by bringing

G, E and A6 to VIL while W is at VIH and A9 at VID.

Under these conditions, readingthe data output will

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 VID.

The addresses inputs A6, A12, A16 must be main-

tained at VIH. Block Unprotect is performed through

a Presto F Erase like algorithm. Unprotect is initi-

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

of 10ms, the edge of W rising to VIH will end the

unprotection operation. Unprotect verify is

achieved by bringing G and E to VIL while A6 and

W are at VIH and A9 at VID. In these conditions,

reading the output data will yield 00h if the block

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

cessfullyunprotected.All combinations of A16-A18

must be addressed in order to ensure that all of the

8 uniform blocks have been unprotected. Block

Protection Status is shown in Table 5.

7/31

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