M58LW64D datasheet(15/50 Pages) STMICROELECTRONICS

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M58LW064D

memory array. The block must be unprotected us-

ing the Blocks Unprotect command or by using the

Blocks Temporary Unprotect feature of the Reset/

Power-Down pin, RP.

Write to Buffer and Program Command. The

Write to Buffer and Program command is used to

program the memory array.

Up to 16 Words/32 Bytes can be loaded into the

Write Buffer and programmed into the memory.

Each Write Buffer has the same A5-A22 address-

es. In Byte-wide mode only A0-A4 may change in

Word-wide mode only A1-A4 may change.

Four successive steps are required to issue the

command.

One Bus Write operation is required to set up

the Write to Buffer and Program Command.

Issue the set up command with the selected

memory Block Address where the program

operation should occur (any address in the

block where the values will be programmed

can be used). Any Bus Read operations will

start to output the Status Register after the 1st

cycle.

Use one Bus Write operation to write the same

block address along with the value N on the

Data Inputs/Output, where N+1 is the number

of Words/Bytes to be programmed.

Use N+1 Bus Write operations to load the

address and data for each Word into the Write

Buffer. See the constraints on the address

combinations listed below. The addresses

must have the same A5-A22.

Finally, use one Bus Write operation to issue

the final cycle to confirm the command and

start the Program operation.

Invalid address combinations or failing to follow

the correct sequence of Bus Write cycles will set

an error in the Status Register and abort the oper-

ation without affecting the data in the memory ar-

ray. The Status Register should be cleared before

re-issuing the command.

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

memory array. The block must be unprotected us-

ing the Blocks Unprotect command.

See APPENDIX C., Figure 16., Write to Buffer and

Program Flowchart and Pseudo Code, for a sug-

gested flowchart on using the Write to Buffer and

Program command.

Program/Erase Suspend Command. The

Pro-

gram/Erase Suspend command is used to pause a

Word/Byte Program, Write to Buffer and Program

or Erase operation. The command will only be ac-

cepted during a Program or an Erase operation. It

can be issued at any time during an Erase opera-

tion but will only be accepted during a Word Pro-

gram or Write to Buffer and Program command if

the Program/Erase Controller is running.

One Bus Write cycle is required to issue the Pro-

gram/Erase Suspend command and pause the

Program/Erase Controller. Once the command is

issued it is necessary to poll the Program/Erase

Controller Status bit (SR7) to find out when the

Program/Erase Controller has paused; no other

commands will be accepted until the Program/

Erase Controller has paused. After the Program/

Erase Controller has paused, the memory will con-

tinue to output the Status Register until another

command is issued.

During the polling period between issuing the Pro-

gram/Erase Suspend command and the Program/

Erase Controller pausing it is possible for the op-

eration to complete. Once the Program/Erase

Controller Status bit (SR7) indicates that the Pro-

gram/Erase Controller is no longer active, the Pro-

gram Suspend Status bit (SR2) or the Erase

Suspend Status bit (SR6) can be used to deter-

mine if the operation has completed or is suspend-

ed. For timing on the delay between issuing the

Program/Erase Suspend command and the Pro-

gram/Erase Controller pausing see Table 9.

During Program/Erase Suspend the Read Memo-

ry Array, Read Status Register, Read Electronic

Signature, Read Query and Program/Erase Re-

sume commands will be accepted by the Com-

mand Interface. Additionally, if the suspended

operation was Erase then the Write to Buffer and

Program, and the Program Suspend commands

will also be accepted. When a program operation

is completed inside a Block Erase Suspend the

Read Memory Array command must be issued to

reset the device in Read mode, then the Erase Re-

sume command can be issued to complete the

whole sequence. Only the blocks not being erased

may be read or programmed correctly.

See APPENDIX C., Figure 17., Program Suspend

& Resume Flowchart and Pseudo Code, and Fig-

ure 19., Erase Suspend & Resume Flowchart and

Pseudo Code, for suggested flowcharts on using

the Program/Erase Suspend command.

Program/Erase Resume Command. The

Pro-

gram/Erase Resume command can be used to re-

start

the

Program/Erase

Controller

after

Program/Erase Suspend operation has paused it.

One Bus Write cycle is required to issue the Pro-

gram/Erase Resume command. Once the com-

mand is issued subsequent Bus Read operations

read the Status Register.

Block Protect Command. The

Block

Protect

command is used to protect a block and prevent

Program or Erase operations from changing the

data in it. Two Bus Write cycles are required to is-

sue the Block Protect command; the second Bus

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