M36DR232 datasheet(11/46 Pages) STMICROELECTRONICS

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M36D232A, M36DR232B

INSTRUCTIONS AND COMMANDS

Seventeen instructions are defined (see Table

15), and the internal P/E.C. automatically handles

all timing and verification of the Program and

Erase operations. The Status Register Data Poll-

ing, Toggle, Error bits can be read at any time, dur-

ing programming or erase, to monitor the progress

of the operation.

Instructions, made up of one or more commands

writtenincycles, can begiven to theProgram/

Erase Controller through a Command Interface

(C.I.). The C.I. latches commands written to the

memory. Commands are made of address and

data sequences. Two Coded Cycles unlock the

Command Interface. They are followed by an input

command or a confirmation command. The Coded

Sequence consists of writing the data AAh at the

address 555h during the first cycle and the data

55h at the address 2AAh during the second cycle.

Instructions are composed of up to six cycles. The

first two cycles input a Coded Sequence to the

Command Interface which is common to all in-

structions (see Table 15). The third cycle inputs

the instruction set-up command. Subsequent cy-

cles output the addressed data, Electronic Signa-

ture, Block Protection, Configuration Register

Status or CFI Query for Read operations. In order

to give additional data protection, the instructions

for Block Erase and Bank Erase require further

command inputs. For a Program instruction, the

fourth command cycle inputs the address and data

to be programmed. For a Double Word Program-

ming instruction, the fourth and fifth command cy-

cles

input

the

address

and

data

programmed. For a Block Erase and Bank Erase

instructions, the fourth and fifth cycles input a fur-

ther Coded Sequence before the Erase confirm

command on the sixth cycle. Any combination of

blocks of the same memory bank can be erased.

Erasure of a memory block may be suspended, in

order to read data from another block or to pro-

gram data in another block, and then resumed.

When power is first applied the command interface

is reset to Read Array.

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 ensure maximum

data security.

Table 13. Commands

Read/Reset (RD) Instruction. The

Read/Reset

instruction consists of one write cycle giving the

command F0h. It can be optionally preceded by

the two Coded Cycles. Subsequent read opera-

tions will read the memory array addressed and

output the data read.

CFI Query (RCFI) Instruction. Common

Flash

Interface Query mode is entered writing 98h at ad-

dress 55h. The CFI data structure gives informa-

tion on the device, such as the sectorization, the

command set and some electrical specifications.

Table 18, 19, 20 and 21 show the addresses used

to retrieve each data. The CFI data structure con-

tains also a security area; in this section, a 64 bit

unique security number is written, starting at ad-

dress 80h. This area can be accessed only in read

mode by the final user and there are no ways of

changing the code after it has been written by ST.

Write a read instruction (RD) to return to Read

mode.

Auto Select (AS) Instruction. This instruction uses

two Coded Cycles followed by one write cycle giv-

ing the command 90h to address 555h for com-

mand set-up. A subsequent read will output the

Manufacturer or the Device Code (Electronic Sig-

nature), the Block Protection status or the Config-

uration Register status depending on the levels of

A0 and A1 (see Table 10, 11 and 12). A7-A2 must

be at VIL, while other address input are ignored.

Hex Code

Command

00h

Bypass Reset

10h

Bank Erase Confirm

20h

Unlock Bypass

30h

Block Erase Resume/Confirm

40h

Double Word Program

60h

Block Protect, or

Block Unprotect, or

Block Lock, or

Write Configuration Register

80h

Set-up Erase

90h

Read Electronic Signature, or

Block Protection Status, or

Configuration Register Status

98h

CFI Query

A0h

Program

B0h

Erase Suspend

F0h

Read Array/Reset

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