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Table 13. 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 (LPC 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 (LPC Interface

only)

‘1’

‘0’

‘1’

Erase failure due to failed cell(s)

‘1’

‘0’

‘1’

‘0’

STATUS REGISTER

The Status Register provides information on the

current or previous Program or Erase operation.

Different bits in the Status Register convey

different information and errors on the operation.

To read the Status Register the Read Status

Erase and Program/Erase Resume commands

are issued. The Status Register can be read from

any address.

The Status Register bits are summarized in Table

13, Status Register Bits. Refer to Table 13 in con-

junction with the text descriptions below.

Program/Erase Controller Status (Bit 7). The Pro-

gram/Erase Controller Status bit indicates whether

the Program/Erase Controller is active or inactive.

When the Program/Erase Controller Status bit is

‘0’, the Program/Erase Controller is active; when

the bit is ‘1’, the Program/Erase Controller is inac-

tive.

The Program/Erase Controller Status is ‘0’ imme-

diately after a Program/Erase Suspend command

is issued until the Program/Erase Controller paus-

es. After the Program/Erase Controller pauses the

bit is ‘1’.

During Program and Erase operation the Pro-

gram/Erase Controller Status bit can be polled to

find the end of the operation. The other bits in the

Status Register should not be tested until the Pro-

gram/Erase Controller completes the operation

and the bit is ‘1’.

After the Program/Erase Controller completes its

operation the Erase Status, Program Status, VPP

Status and Block Protection Status bits should be

tested for errors.

Erase Suspend Status (Bit 6). The Erase Sus-

pend Status bit indicates that a Block Erase oper-

ation has been suspended and is waiting to be

resumed. The Erase 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 Erase Suspend Status bit is ‘0’ the Pro-

gram/Erase Controller is active or has completed

its operation; when the bit is ‘1’ a Program/Erase

Suspend command has been issued and the

memory is waiting for a Program/Erase Resume

command.

When a Program/Erase Resume command is is-

sued the Erase Suspend Status bit returns to ‘0’.

Erase Status (Bit 5). The Erase Status bit can be

used to identify if the memory has applied the

maximum number of erase pulses to the block(s)

and still failed to verify that the block(s) has erased

correctly. The Erase Status bit should be read

once the Program/Erase Controller Status bit is ‘1’

(Program/Erase Controller inactive).

When the Erase Status bit is ‘0’ the memory has

successfully verified that the block(s) has erased

correctly; when the Erase Status bit is ‘1’ the Pro-

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