M58BW016DB datasheet(24/63 Pages) STMICROELECTRONICS

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the command is issued then a fast erase operation

will be executed, otherwise the operation will use

VDD. If VPP goes below the VPP Lockout Voltage,

VPPLK, during a fast erase the operation aborts,

the Status Register VPP Status bit is set to ‘1’ and

the command must be re-issued.

Typical Erase times are given in Table 10.

See Appendix B, Figure 23, Block Erase Flowchart

and Pseudo Code, for a suggested flowchart on

using the Block Erase command.

Program Command.

The Program command is used to program the

memory array. Two Bus Write operations are re-

quired to issue the command; the first write cycle

sets up the Program command, the second write

cycle latches the address and data to be pro-

grammed in the internal state machine and starts

the Program/Erase Controller. A program opera-

tion can be aborted by writing FFFFFFFFh to any

address after the program set-up command has

been given.

Once the command is issued subsequent Bus

Read operations read the Status Register. See the

section on the Status Register for details on the

definitions of the Status Register bits. During the

Program operation the memory will only accept

the Read Status Register command and the Pro-

gram/Erase Suspend command. All other com-

mands will be ignored.

If Reset/Power-down, RP, falls to VIL during pro-

gramming the operation will be aborted.

The command can be executed using either VDD

(for a normal program operation) or VPP (for a fast

program operation). If VPP is in the VPPH range

when the command is issued then a fast program

operation will be executed, otherwise the opera-

tion will use VDD. If VPP goes below the VPP Lock-

out Voltage, VPPLK, during a fast program the

operation aborts and the Status Register VPP Sta-

tus bit is set to ‘1’. As data integrity cannot be guar-

anteed when the program operation is aborted, the

memory block must be

erased and repro-

grammed.

See Appendix B, Figure 21, Program Flowchart

and Pseudo Code, for a suggested flowchart on

using the Program command.

Program/Erase Suspend Command

The Program/Erase Suspend command is used to

pause a Program or Erase operation. The com-

mand will only be accepted during a Program or

Erase operation. It can be issued at any time dur-

ing a program or erase operation. The command

is ignored if the device is already in suspend

mode.

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 (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 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 (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 Program and the

Program Suspend commands will also be accept-

ed. 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 Resume command

can be issued to complete the whole sequence.

Only the blocks not being erased may be read or

programmed correctly.

See Appendix B, Figure 22, Program Suspend &

Resume Flowchart and Pseudo Code, and Figure

24, Erase Suspend & Resume Flowchart and

Pseudo Code, for suggested flowcharts on using

the Program/Erase Suspend command.

Program/Erase Resume Command

The Program/Erase Resume command can be

used to restart the Program/Erase Controller after

a Program/Erase Suspend operation has paused

it. One Bus Write cycle is required to issue the Pro-

gram/Erase Resume command.

See Appendix B, Figure 22, Program Suspend &

Resume Flowchart and Pseudo Code, and Figure

24, Erase Suspend & Resume Flowchart and

Pseudo Code, for suggested flowcharts on using

the Program/Erase Resume command.

Set Burst Configuration Register Command.

The Set Burst Configuration Register command is

used to write a new value to the Burst Configura-

tion Control Register which defines the burst

length, type, X and Y latencies, Synchronous/

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