M28W320CT datasheet(9/42 Pages) STMICROELECTRONICS

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M28W320CT, M28W320CB

INSTRUCTIONS AND COMMANDS

Sixteen instructions are available (see Tables 9

and 10) to perform Read Memory Array, Read Sta-

tus Register, Read Electronic Signature, CFI Que-

ry, Erase, Program, Double Word Program, Clear

Status Register, Program/Erase Suspend, Pro-

gram/Erase Resume, Block Protect, Block Unpro-

tect, Block Lock and Protection Register Program.

Status Register output may be read at any time,

during programming or erase, to monitor the

progress of the operation.

An internal Command Interface (C.I.) decodes the

instructions while an internal Program/Erase Con-

troller (P/E.C.) handles all timing and verifies the

correct execution of the Program and Erase in-

structions. P/E.C. provides a Status Register

whose bits indicate operation and exit status of the

internal algorithms.

The Command Interface is reset to Read Array

when power is first applied, when exiting from Re-

set or whenever VDD is lower than VLKO. Com-

mand sequence must be followed exactly. Any

invalid combination of commands will reset the de-

vice to Read Array.

Read (RD)

The Read instruction consists of one write cycle

(refer to Device Operations section) giving the

command FFh. Next read operations will read the

addressed location and output the data. When a

device reset occurs, the memory is in Read Array

as default.

Read Status Register (RSR)

The Status Register indicates when a program or

erase operation is complete and the success or

failure of operation itself. Issue a Read Status

ister content. The Read Status Register instruction

may be issued at any time, also when a Program/

Erase operation is ongoing. The following Read

operations output the content of the Status Regis-

ter. The Status Register is latched on the falling

edge of E or G signals, and can be read until E or

G returns to VIH. Either E or G must be toggled to

update the latched data. Additionally, any read at-

tempt during program or erase operation will auto-

matically output the content of the Status Register.

Read Electronic Signature (RSIG)

The Read Electronic Signature instruction con-

sists of one write cycle (refer to Device Operations

section) giving the command 90h. A subsequent

read will output the Manufacturer Code, the De-

vice Code, the Block protection Status, or the Pro-

tection Register. See Tables 6, 7 and 8 for the

valid address. The Electronic Signature can be

read from the memory allowing programming

equipment or applications to automatically match

their

interface

the

characteristics

M28W320C.

CFI Query (RCFI)

The Common Flash Interface Query mode is en-

tered by writing 98h. Next read operations will read

the CFI data. The CFI data structure contains also

a security area; in this section, a 64 bit unique se-

curity number is written, starting at this address

81h. This area can be accessed only in read mode

and there are no ways of changing the code after

it has been written by ST. Write a read instruction

to return to Read mode (refer to the Common

Flash Interface section).

Table 9. Commands

Hex Code

Command

00h

Invalid/Reserved

10h

Alternative Program Set-up

20h

Erase Set-up

30h

Double Word Program Set-up

40h

Program Set-up

50h

Clear Status Register

70h

Read Status Register

90h or 98h

Read Electronic Signature, or

CFI Query

B0h

Program/Erase Suspend

D0h

Program/Erase Resume, Erase

Confirm or Unprotect Confirm

FFh

Read Array

01h

Protect Confirm

2Fh

Lock Confirm

C0h

Protection Program

60h

Protection Set-up

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