M58LW64D datasheet(14/50 Pages) STMICROELECTRONICS

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M58LW064D

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COMMAND INTERFACE

All Bus Write operations to the memory are inter-

preted by the Command Interface. Commands

consist of one or more sequential Bus Write oper-

ations. The Commands are summarized in Table

4., Commands. Refer to Table 4. in conjunction

with the text descriptions below.

After power-up or a Reset operation the memory

enters Read mode.

Read Memory Array Command. The Read Mem-

ory Array command is used to return the memory

to Read mode. One Bus Write cycle is required to

issue the Read Memory Array command and re-

turn the memory to Read mode. Once the com-

mand is issued the memory remains in Read

mode until another command is issued. From

Read mode Bus Read operations will access the

memory array. After power-up or a reset the mem-

ory defaults to Read Array mode (Page Read).

While the Program/Erase Controller is executing a

Program, Erase, Block Protect, Blocks Unprotect

or Protection Register Program operation the

memory will not accept the Read Memory Array

command until the operation completes.

Read Electronic Signature Command. The Read

Electronic Signature command is used to read the

Manufacturer Code, the Device Code, the Block

Protection Status and the Protection Register.

One Bus Write cycle is required to issue the Read

Electronic Signature command. Once the com-

mand is issued subsequent Bus Read operations

read the Manufacturer Code, the Device Code, the

Block Protection Status or the Protection Register

until another command is issued. Refer to Table

6., Read Electronic Signature, Tables 7 and 8,

Word and Byte-wide Read Protection Register

and Figure 6., Protection Register Memory Map,

for information on the addresses.

Read Query Command. The Read Query Com-

mand is used to read data from the Common Flash

Interface (CFI) Memory Area. One Bus Write cycle

is required to issue the Read Query Command.

Once the command is issued subsequent Bus

Read operations read from the Common Flash In-

terface Memory Area. See APPENDIX B., Tables

24, 25, 26, 27, 28 and 29 for details on the infor-

mation contained in the Common Flash Interface

(CFI) memory area.

Read Status Register Command. The Read Sta-

tus Register command is used to read the Status

the Read Status Register command. Once the

command is issued subsequent Bus Read opera-

tions read the Status Register until another com-

mand is issued.

The Status Register information is present on the

output data bus (DQ1-DQ7) when the device is en-

abled and Output Enable is Low, VIL.

See the section on the Status Register and Table

10. for details on the definitions of the Status Reg-

ister bits

Clear Status Register Command. The Clear Sta-

tus Register command can be used to reset bits

SR1, SR3, SR4 and SR5 in the Status Register to

‘0’. One Bus Write is required to issue the Clear

Status Register command.

The bits in the Status Register are sticky and do

not automatically return to ‘0’ when a new Write to

Buffer and Program, Erase, Block Protect, Block

Unprotect or Protection Register Program com-

mand is issued. If any error occurs then it is essen-

tial to clear any error bits in the Status Register by

issuing the Clear Status Register command before

attempting a new Program, Erase or Resume

command.

Block Erase Command. The Block Erase com-

mand can be used to erase a block. It sets all of

the bits in the block to ‘1’. All previous data in the

block is lost. If the block is protected then the

Erase operation will abort, the data in the block will

not be changed and the Status Register will output

the error.

Two Bus Write operations are required to issue the

command; the second Bus Write cycle latches the

block address in the internal state machine and

starts the Program/Erase Controller. Once the

command is issued subsequent Bus Read opera-

tions read the Status Register. See the section on

the Status Register for details on the definitions of

the Status Register bits.

During the Erase operation the memory will only

accept the Read Status Register command and

the Program/Erase Suspend command. All other

commands will be ignored. Typical Erase times

are given in Table 9.

See APPENDIX C., Figure 18., Erase Flowchart

and Pseudo Code, for a suggested flowchart on

using the Block Erase command.

Word/Byte Program Command. The

Word/

Byte Program command is used to program a sin-

gle Word or Byte in the memory array. Two Bus

Write operations are required to issue the com-

mand; the first write cycle sets up the Word Pro-

gram command, the second write cycle latches the

address and data to be programmed in the internal

state machine and starts the Program/Erase Con-

troller.

If the block being programmed is protected an er-

ror will be set in the Status Register and the oper-

ation will abort without affecting the data in the

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