S29WS-P SPANSION [SPANSION], S29WS-P Datasheet - Page 40

• Manufacturer Part Number: S29WS-P
• Description: 512/256/128 Mb (32/16/8 M x 16 bit) 1.8 V Burst Simultaneous Read/Write MirrorBit Flash Memory
• Manufacturer: SPANSION [SPANSION]

38
7.7.6
Erase Suspend/Erase Resume Commands
When the Erase Suspend command is written during the sector erase time-out, the device immediately
terminates the time-out period and suspends the 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. The bank address is required when writing this command. This command is valid only
during the sector erase operation, including the minimum t
command sequence. The Erase Suspend command is ignored if written during the chip erase operation.
When the Erase Suspend command is written after the t
erase operation, the device requires a minimum of t
operation.
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 device 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
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.
Note: While an erase operation can be suspended and resumed multiple times, a minimum delay of t
(Erase Resume to Suspend) is required from resume to the next suspend.
In the erase-suspend-read mode, the system can also issue the Autoselect command sequence. Refer to
Write Buffer Programming on page 30
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.
Software Functions and Sample Code
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.spansion.com) for general information on Spansion Flash
memory software development guidelines.
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.spansion.com) for general information on Spansion Flash
memory software development guidelines.
/* Example: Erase suspend command */
/* Example: Erase resume command */
*( (UINT16 *)bank_addr + 0x000 ) = 0x00B0;
*( (UINT16 *)bank_addr + 0x000 ) = 0x0030;
/* The flash needs adequate time in the resume state */
Cycle
Cycle
1
1
Operation
Operation
D a t a
Write
Write
S h e e t
(LLD Function = lld_EraseSuspendCmd)
(LLD Function = lld_EraseResumeCmd)
and
Table 7.30 Erase Suspend
S29WS-P
Table 7.31 Erase Resume
Byte Address
Byte Address
Bank Address
Autoselect on page 26
Bank Address
( A d v a n c e
Table 7.36 on page 45
ESL
SEA
(erase suspend latency) to suspend the erase
SEA
time-out period has expired and during the sector
/* write suspend command
/* write resume command
time-out period during the sector erase
I n f o r m a t i o n )
Word Address
Word Address
Bank Address
Bank Address
for details.
for information on these status bits.
S29WS-P_00_A7 November 8, 2006
00B0h
0030h
Data
Data
ERS
*/
*/