29F040 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

001

000

Figure 3. Memory Map and Block Address Table

Hex Code

Command

00h

Read

10h

Chip Erase Confirm

30h

Block Erase Resume/Confirm

80h

Set-up Erase

90h

Read Electronic Signature/

Block Protection Status

A0h

Program

B0h

Erase Suspend

F0h

Read Array/Reset

Table 7. Commands

Instructions and Commands

The Command Interface (C.I.) latches commands

written to the memory. Instructions are made up

from one or more commands to perform Read

Array/Reset, Read Electronic Signature, Block

Erase, Chip Erase, Program, Block Erase Suspend

and Erase Resume. Commands are made of ad-

dress and data sequences. Addresses are latched

on the falling edge of W or E and data is latched

on the rising of W or E. The instructions require from

1 to 6 cycles, the first or first three of which are

always write operations used to initiate the com-

mand. They are followed by either further write

cycles to confirm the first command or execute the

command immediately. Command sequencing

must be followed exactly. Any invalid combination

of commands will reset the device to Read Array.

The increased number of cycles has been chosen

to assure maximum data security. Commands are

initialised by two preceding coded cycles which

unlock the Command Interface. In addition, for

Erase, command confirmation is again preceeded

by the two coded cycles.

P/E.C. status is indicated during command execu-

tion by Data Polling on DQ7, detection of Toggle on

DQ6, or Error on DQ5 and Erase Timer DQ3 bits.

Any read attempt during Program or Erase com-

mand execution will automatically output those four

bits. The P/E.C. automatically sets bits DQ3, DQ5,

DQ6 and DQ7. Other bits (DQ0, DQ1, DQ2 and

DQ4) are reserved for future use and should be

masked.

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