S75WS256NDFBAWMB datasheet(121/216 Pages) SPANSION

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February 17, 2005 S75WS-N-00_00_A0

S75WS256Nxx Based MCPs

119

Data

Sheet

20 Erase Suspend/Erase Resume Commands

Notes:

1.See the Command Definitions table for erase command sequence.

2.See the section on DQ3 for information on the sector erase timer.

Figure 20.4 Erase Operation

The Erase Suspend command allows the system to interrupt a sector erase operation and then

read data from, or program data to, any sector not selected for erasure. This command is valid

only during the sector erase operation, including the minimum tSEA time-out period during the

sector erase command sequence. The Erase Suspend command is ignored if written during the

chip erase operation or Embedded Program algorithm.

When the Erase Suspend command is written during the sector erase operation, the device re-

quires a maximum of tESL (Erase Suspend Latency) to suspend the erase operation. However,

when the Erase Suspend command is written during the sector erase time-out, the device imme-

diately terminates the time-out period and suspends the erase operation.

After the erase operation has been suspended, the device enters the erase-suspend-read mode.

The system can read data from or program data to any sector not selected for erasure. (The de-

vice erase suspends all sectors selected for erasure.) Reading at any address within erase-

suspended sectors produces status information on DQ7–DQ0. The system can use DQ7, or DQ6

and DQ2 together, to determine if a sector is actively erasing or is erase-suspended. See Write

Operation Status for information on these status bits.

After an erase-suspended program operation is complete, the device returns to the erase-sus-

pend-read mode. 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.

In the erase-suspend-read mode, the system can also issue the autoselect command sequence.

See Write Buffer Programming Operation and Autoselect Command Sequence for details. To re-

sume the sector erase operation, the system must write the Erase Resume command. Further

writes of the Resume command are ignored. Another Erase Suspend command can be written

after the chip has resumed erasing.

20.1 Program Suspend/Program Resume Commands

The Program Suspend command allows the system to interrupt a embedded programming oper-

ation or a Write to Buffer programming operation so that data can read from any non-suspended

sector. When the Program Suspend command is written during a programming process, the de-

vice halts the programming operation within tPSL (Program Suspend Latency) and updates the

status bits. Addresses are don’t-cares when writing the Program Suspend command.

After the programming operation has been suspended, the system can read array data from any

non-suspended sector. The Program Suspend command may also be issued during a program-

ming operation while an erase is suspended. In this case, data may be read from any addresses

not in Erase Suspend or Program Suspend. If a read is needed from the SecSi Sector area (One

Time Program area), then user must use the proper command sequences to enter and exit this

region. The system may also write the autoselect command sequence when the device is in Pro-

gram Suspend mode. The device allows reading autoselect codes in the suspended sectors, since

the codes are not stored in the memory array. When the device exits the autoselect mode, the

device reverts to Program Suspend mode, and is ready for another valid operation. See Autoselect

Command Sequence for more information.

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