S75WS256NDFBAWMB datasheet(43/216 Pages) SPANSION

43 / 216 page

February 17, 2005 S75WS-N-00_A0

S75WS256Nxx Based MCPs

Advance

Information

After the erase operation has been suspended, the bank 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. Refer to

Table 8.23 for information on these status bits.

After an erase-suspended program operation is complete, the bank returns to the erase-suspend-

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.

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

See Write Buffer Programming and Autoselect for details.

To resume the sector erase operation, the system must write the Erase Resume command. The

bank address of the erase-suspended bank is required when writing this command. Further writes

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

chip has resumed erasing.

The following is a C source code example of using the erase suspend function. Refer to the

Spansion Low Level Driver User’s Guide (available on www.amd.com and www.fujitsu.com)

for general information on Spansion Flash memory software development guidelines.

/* Example: Erase suspend command */

*( (UINT16 *)bank_addr + 0x000 ) = 0x00B0;

/* write suspend command

The following is a C source code example of using the erase resume function. Refer to the

Spansion Low Level Driver User’s Guide (available on www.amd.com and www.fujitsu.com)

for general information on Spansion Flash memory software development guidelines.

/* Example: Erase resume command */

*( (UINT16 *)bank_addr + 0x000 ) = 0x0030;

/* write resume command

/* The flash needs adequate time in the resume state */

8.5.6

Program Suspend/Program Resume Commands

The Program Suspend command allows the system to interrupt an embedded programming op-

eration 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 pro-

cess, the device 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.

Software Functions and Sample Code

Table 8.16 Erase Suspend

(LLD Function = lld_EraseSuspendCmd)

Cycle

Operation

Byte Address

Word Address

Data

Write

Bank Address

00B0h

Table 8.17 Erase Resume

(LLD Function = lld_EraseResumeCmd)

Cycle

Operation

Byte Address

Word Address

Data

Write

Bank Address

0030h

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