M50FLW040A datasheet(23/52 Pages) STMICROELECTRONICS

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M50FLW040A, M50FLW040B

When the Program Suspend Status bit is ‘0’, the

Program/Erase Controller is active, or has com-

pleted its operation. When the bit is ‘1’, a Program/

Erase Suspend command has been issued and

the memory is waiting for a Program/Erase Re-

sume command.

When a Program/Erase Resume command is is-

sued, the Program Suspend Status bit returns to

‘0’.

Block Protection Status (Bit SR1). The

Block

Protection Status bit can be used to identify if the

Program or Erase operation has tried to modify the

contents of a protected block. When the Block Pro-

tection Status bit is to ‘0’, no Program or Erase op-

erations have been attempted to protected blocks

since the last Clear Status Register command or

hardware reset. When the Block Protection Status

bit is ‘1’, a Program or Erase operation has been

attempted on a protected block.

Once it is set to ‘1’, the Block Protection Status bit

can only be reset to ‘0’ by a Clear Status Register

command or by a hardware reset. If it is set to ‘1’,

it should be reset before a new Program or Erase

command is issued, otherwise the new command

will appear to have failed, too.

Using the A/A Mux Interface, the Block Protection

Status bit is always ‘0’.

Reserved (Bit SR0). Bit 0 of the Status Register

is reserved. Its value should be masked.

Table 14. Status Register Bits

Note: 1. For Program operations during Erase Suspend Bit SR6 is ‘1’, otherwise Bit SR6 is ‘0’.

Operation

SR7

SR6

SR5

SR4

SR3

SR2

SR1

Program active

‘0’

X(1)

‘0’‘0’‘0’‘0’‘0’

Program suspended

‘1

X(1)

‘0’‘0’‘0’‘1’‘0’

Program completed successfully

‘1’

X(1)

‘0’‘0’‘0’‘0’‘0’

Program failure due to VPP Error

‘1’

X(1)

‘0’‘1’‘1’‘0’‘0’

Program failure due to Block Protection (FWH/LPC Interface

only)

‘1’

X(1)

‘0’‘1’‘0’‘0’‘1’

Program failure due to cell failure

‘1’

X(1)

‘0’‘1’‘0’‘0’‘0’

Erase active

‘0’‘0’‘0’‘0’‘0’‘0’‘0’

Erase suspended

‘1’‘1’‘0’‘0’‘0’‘0’‘0’

Erase completed successfully

‘1’‘0’‘0’‘0’‘0’‘0’‘0’

Erase failure due to VPP Error

‘1’‘0’‘1’‘0’‘1’‘0’‘0’

Erase failure due to Block Protection (FWH/LPC Interface

only)

‘1’‘0’‘1’‘0’‘0’‘0’‘1’

Erase failure due to failed cell(s) in block

‘1’‘0’‘1’‘0’‘0’‘0’‘0’

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