S75WS256NDFBAWMB datasheet(122/216 Pages) SPANSION

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120

S75WS256Nxx Based MCPs

S75WS-N-00_00_A0 February 17, 2005

Data

Sheet

After the Program Resume command is written, the device reverts to programming. The system

can determine the status of the program operation using the DQ7 or DQ6 status bits, just as in

the standard program operation. See Write Operation Status for more information. The system

must write the Program Resume command (address bits are don’t care) to exit the Program Sus-

pend mode and continue the programming operation. Further writes of the Program Resume

command are ignored. Another Program Suspend command can be written after the device has

resume programming.

20.2 Volatile Sector Protection Command Set

The Volatile Sector Protection Command Set permits the user to set the Dynamic Protection Bit

(DYB), clear the Dynamic Protection Bit (DYB), and read the logic state of the Dynamic Protection

Bit (DYB).

The Volatile Sector Protection Command Set Entry command sequence must be issued prior

to any of the commands listed following to enable proper command execution. Note that issuing

the Volatile Sector Protection Command Set Entry command disables reads and writes for

the device with the command.

DYB Set Command

DYB Clear Command

DYB Status Read Command

The DYB Set/Clear command is used to set or clear a DYB for a given sector. The address bits

are issued at the same time as the code 00h or 01h on DQ7-DQ0. All other DQ data bus pins are

ignored during the data write cycle. The DYBs are modifiable at any time, regardless of the state

of the PPB or PPB Lock Bit. The DYBs are cleared (erased to ‘1’) at power-up or hardware reset

and are thus in an unprotected state.

The programming state of the DYB for a given sector can be verified by writing a DYB Status

Read Command to the device.

The Volatile Sector Protection Command Set Exit command must be issued after the execu-

tion of the commands listed previously to reset the device to read mode. Otherwise the device

will hang.

Note that issuing the Volatile Sector Protection Command Set Exit command re-enables

reads and writes for the device.

S75WS256NDFBAWMB Datasheet(PDF) 122 Page - SPANSION