M30LW128D datasheet(18/57 Pages) STMICROELECTRONICS

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M30LW128D

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any command. Typical Erase times are given in

Table 10.

See Appendix C, Figure 21, Block Erase Flow-

chart 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

memory array. The block must be unprotected us-

ing the Blocks Unprotect command.

Write to Buffer and Program Command. The

Write to Buffer and Program command is used to

program the memory array. If the command is is-

sued with A23 High the Upper Memory will be pro-

grammed, if the command is issued with A23 Low

the Lower Memory will be programmed.

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

Write Buffer and programmed into the memory ar-

ray. Each Write Buffer has the same A5-A22 ad-

dresses. 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.

1. One Bus Write operation is required to set up

the Write to Buffer and Program Command. Is-

sue the set up command with the selected

memory Block Address where the program op-

eration should occur (any address in the block

where the values will be programmed can be

used). Any Bus Read operations will start to out-

put the Status Register after the 1st cycle.

2. 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.

3. Use N+1 Bus Write operations to load the ad-

dress and data for each Word into the Write

Buffer. The addresses must have the same A5-

A22.

4. 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 19, 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

Write to Buffer and Program or Erase operation.

The command will only be accepted during a Pro-

gram or an Erase operation. It can be issued at

any time during an Erase operation but will only be

accepted during a Write to Buffer and Program

command if the Program/Erase Controller is run-

ning.

One Bus Write cycle is required to issue the Pro-

gram/Erase Suspend command and pause the

Program/Erase Controller. The command must be

issued to the same address as the current Pro-

gram or Erase operation. Once the command is is-

sued it is necessary to poll the Program/Erase

Controller Status bit (bit 7) 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 device 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 (bit 7) indicates that the Pro-

gram/Erase Controller is no longer active, the Pro-

gram Suspend Status bit (bit 2) or the Erase

Suspend Status bit (bit 6) 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 10.

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 Word Program,

Write to Buffer and Program, and Program Sus-

pend commands will also be accepted.

When one of the devices is being Program or

Erase Suspended, any command issued to the

other internal Flash memory will be accepted.

When a program operation is completed inside a

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