M50FW002K1T datasheet(16/39 Pages) STMICROELECTRONICS

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M50FW002

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Program Suspend Status (Bit 2). The Program

Suspend Status bit indicates that a Program oper-

ation has been suspended and is waiting to be re-

sumed. The Program Suspend Status should only

be considered valid when the Program/Erase

Controller Status bit is ‘1’ (Program/Erase Control-

ler inactive); after a Program/Erase Suspend com-

mand is issued the memory may still complete the

operation rather than entering the Suspend mode.

When the Program Suspend Status bit is ‘0’ the

Program/Erase Controller is active or has complet-

ed 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 1). The Block Pro-

tection Status bit can be used to identify if the Pro-

gram 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 at-

tempted 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 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 fail.

Using the A/A Mux Interface the Block Protection

Status bit is always ‘0’.

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

reserved. Its value should be masked.

Table 10. Status Register Bits

Note: 1. For Program operations during Erase Suspend Bit 6 is ‘1’, otherwise Bit 6 is ‘0’.

Operation

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Program active

‘0’

X 1

‘0’

Program suspended

‘1

X 1

‘0’

‘1’

‘0’

Program completed successfully

‘1’

X 1

‘0’

Program failure due to VPP Error

‘1’

X 1

‘0’

‘1’

‘0’

Program failure due to Block Protection (FWH Interface only)

‘1’

X 1

‘0’

‘1’

Program failure due to cell failure

‘1’

X 1

‘0’

‘1’

‘0’

Erase active

‘0’

Block Erase suspended

‘1’

‘0’

Erase completed successfully

‘1’

‘0’

Erase failure due to VPP Error

‘1’

‘0’

‘1’

‘0’

Block Erase failure due to Block Protection (FWH Interface

only)

‘1’

‘0’

‘1’

Erase failure due to failed cell(s)

‘1’

‘0’

‘1’

‘0’

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