M58BW16F datasheet(40/81 Pages) STMICROELECTRONICS

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Status Register

M58BW16F, M58BW32F

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Status Register

The Status Register provides information on the current or previous Program, Erase or

Block Protect operation. The various bits in the Status Register convey information and

errors on the operation. They are output on DQ7-DQ0.

To read the Status Register the Read Status Register command can be issued. The Status

commands. The Status Register can be read from any address.

The contents of the Status Register can be updated during an erase or program operation

by toggling the Output Enable or Output Disable pins or by de-activating (Chip Enable, VIH)

and then reactivating (Chip Enable and Output Enable, VIL, and Output Disable, VIH.) the

device.

The Status Register bits are summarized in Table 13: Status Register Bits. Refer to Table 13

in conjunction with the following text descriptions.

5.1

Program/Erase Controller Status (Bit 7)

The Program/Erase Controller Status bit indicates whether the Program/Erase Controller is

active or inactive. When the Program/Erase Controller Status bit is set to ‘0’, the

Program/Erase Controller is active; when bit7 is set to ‘1’, the Program/Erase Controller is

inactive.

The Program/Erase Controller Status is set to ‘0’ immediately after a Program/Erase

Suspend command is issued until the Program/Erase Controller pauses. After the

Program/Erase Controller pauses the bit is set to ‘1’.

During Program and Erase operations the Program/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 Program/Erase Controller completes the operation and the bit is set to ‘1’.

After the Program/Erase Controller completes its operation the Erase Status (bit5), Program

Status (bit4) bits should be tested for errors.

5.2

Erase Suspend Status (Bit 6)

The Erase Suspend Status bit indicates that an Erase operation 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 set to ‘1’ (Program/Erase Controller inactive); after a

Program/Erase Suspend command is issued the memory may still complete the operation

rather than entering the Suspend mode.

When the Erase Suspend Status bit is set to ‘0’, the Program/Erase Controller is active or

has completed its operation; when the bit is set to ‘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 issued the Erase Suspend Status bit returns

to ‘0’.

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