M59DR032EA datasheet(18/43 Pages) STMICROELECTRONICS

18 / 43 page

M59DR032EA, M59DR032EB

18/43

STATUS REGISTER

The Status Register provides information on the

current or previous Program or Erase operations.

Bus Read operations from any address within the

bank, always read the Status Register during Pro-

gram and Erase operations.

The various bits convey information about the sta-

tus and any errors of the operation.

The bits in the Status Register are summarized in

Table 12, Status Register Bits. Refer to Tables 11

and 12 in conjunction with the following text de-

scriptions.

Data Polling Bit (DQ7). When Program opera-

tions are in progress, the Data Polling bit outputs

the complement of the bit being programmed on

DQ7. For a Double Word Program operation, it is

the complement of DQ7 for the last Word written to

the Command Interface.

During an Erase operation, it outputs a ’0’. After

completion of the operation, DQ7 will output the bit

last programmed or a ’1’ after erasing.

Data Polling is valid and only effective during P/

E.C. operation, that is after the fourth W pulse for

programming or after the sixth W pulse for erase.

It must be performed at the address being pro-

grammed or at an address within the block being

erased. See Figure 21 for the Data Polling flow-

chart and Figure 12 for the Data Polling wave-

forms.

DQ7 will also flag an Erase Suspend by switching

from ’0’ to ’1’ at the start of the Erase Suspend. In

order to monitor DQ7 in the Erase Suspend mode

an address within a block being erased must be

provided. DQ7 will output ’1’ if the read is attempt-

ed on a block being erased and the data value on

other blocks. During a program operation in Erase

Suspend, DQ7 will have the same behavior as in

the normal program.

Toggle Bit (DQ6). When Program or Erase oper-

ations are in progress, successive attempts to

read DQ6 will output complementary data. DQ6

will toggle following the toggling of either G or E.

The operation is completed when two successive

reads give the same output data. The next read

will output the bit last programmed or a ’1’ after

erasing.

The Toggle Bit DQ6 is valid only during P/E.C. op-

erations, that is after the fourth W pulse for pro-

gramming or after the sixth W pulse for Erase.

DQ6 will be set to ’1’ if a read operation is attempt-

ed on an Erase Suspend block. When erase is

suspended DQ6 will toggle during programming

operations in a block different from the block in

Erase Suspend.

See Figure 15 for Toggle Bit flowchart and Figure

13 for Toggle Bit waveforms.

Toggle Bit (DQ2). Toggle Bit DQ2, together with

DQ6, can be used to determine the device status

during erase operations.

During Erase Suspend a read from a block being

erased will cause DQ2 to toggle. A read from a

block not being erased will output data. DQ2 will

be set to '1' during program operation and to ‘0’ in

erase operation. If a read operation is addressed

to a block where an erase error has occurred, DQ2

will toggle.

Error Bit (DQ5). The Error Bit can be used to

identify if an error occurs during a program or

erase operation.

The Error Bit is set to ‘1’ when a program or erase

operation has failed. When it is set to ‘0’ the pro-

gram or erase operation was successful.

If any Program command is used to try to set a bit

from ‘0’ to ‘1’ Status Register Error bit DQ5 will be

set to ‘1’, only if VPP is in the range of 11.4V to

12.6V.

The Error Bit is reset by a Read/Reset command.

Erase Timer Bit (DQ3). The Erase Timer bit is

used to indicate the timeout period for an erase

operation.

When the last block Erase command has been en-

tered to the Command Interface and it is waiting

for the erase operation to start, the Erase Timer Bit

is set to ‘0’. When the erase timeout period is fin-

ished, DQ3 returns to ‘1’, (80µs to 120µs).

DQ0, DQ1 and DQ4 are reserved for future use

and should be masked.

Table 11. Polling and Toggle Bits

Mode

DQ7

DQ6

DQ2

Program

DQ7

Toggle

Erase

Toggle

N/A

Erase Suspend Read

(in Erase Suspend

block)

Toggle

Erase Suspend Read

(outside Erase Suspend

block)

DQ7

DQ6

DQ2

Erase Suspend Program

DQ7

Toggle

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