S29CD032G datasheet(53/93 Pages) SPANSION

53 / 93 page

March 22, 2004 30606B0

S29CD032G

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Sector Erase and Program Suspend Operation Mechanics

The Sector Erase and Program Suspend command is ignored if written during the

execution of the Chip Erase operation or Embedded Program Algorithm (but will

reset the chip if written improperly during the command sequences). Writing the

Sector Erase and Program command during the Sector Erase time-out results in

immediate termination of the time-out period and suspension of the erase oper-

ation. Once in Erase Suspend, the device is available for reading (note that in the

Erase Suspend mode, the Reset command is not required for read operations and

is ignored) or program operations in sectors not being erased. Any other com-

mand written during the Erase Suspend mode is ignored, except for the Sector

Erase and Program Resume command. Writing the Erase and Program Resume

command resumes the sector erase operation. The bank address of the erase

suspended bank is required when writing this command

If the Sector Erase and Program Suspend command is written during a program-

ming operation, the device suspends programming operations and allows only

read operations in sectors not selected for programming. Further nesting of either

erase or programming operations is not permitted. Table 18 summarizes permis-

sible operations during Erase and Program Suspend. (A busy sector is one that is

selected for programming or erasure.):

Table 18. Allowed Operations During Erase/Program Suspend

When the Sector Erase and Program Suspend command is written during a Sector

Erase operation, the chip will take between 0.1 µs and 20 µs to actually suspend

the operation and go into the erase suspended read mode (pseudo-read mode),

at which time the user can read or program from a sector that is not erase sus-

pended. Reading data in this mode is the same as reading from the standard read

mode, except that the data must be read from sectors that have not been erase

suspended.

Polling DQ6 on two immediately consecutive reads from a given address provides

the system with the ability to determine if the device is in Erase or Program Sus-

pend. Before the device enters Erase or Program Suspend, the DQ6 pin toggles

between two immediately consecutive reads from the same address. After the

device has entered Erase suspend, DQ6 stops toggling between two immediately

consecutive reads to the same address. During the Sector Erase operation and

also in Erase suspend mode, two immediately consecutive readings from the

erase-suspended sector causes DQ2 to toggle. DQ2 does not toggle if reading

from a non-busy (non-erasing) sector (stored data is read). No bits are toggled

during program suspend mode. Software must keep track of the fact that the de-

vice is in a suspended mode.

After entering the erase-suspend-read mode, the system may read or program

within any non-suspended sector:

A read operation from the erase-suspended bank returns polling data during

the first 8 µs after the erase suspend command is issued; read operations

thereafter return array data. Read operations from the other bank return

array data with no latency.

Sector

Program Suspend

Erase Suspend

Busy Sector

Program Resume

Erase Resume

Non-busy

sectors

Read Only

Read or Program

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