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S71WS512NC0BAWE70 데이터시트(HTML) 44 Page - SPANSION

부품명 S71WS512NC0BAWE70
상세내용  Stacked Multi-Chip Product (MCP)
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제조사  SPANSION [SPANSION]
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S71WS-Nx0 Based MCPs
S71WS-N_01_A4 September 15, 2005
Ad van c e
Inf o rmation
10.5.4
Chip Erase Command Sequence
Chip erase is a six-bus cycle operation as indicated by Table 15.1. These commands invoke the
Embedded Erase algorithm, which does not require the system to preprogram prior to erase. The
Embedded Erase algorithm automatically preprograms and verifies the entire memory for an all
zero data pattern prior to electrical erase. After a successful chip erase, all locations of the chip
contain FFFFh. The system is not required to provide any controls or timings during these oper-
ations. The “Command Definition” section in the appendix shows the address and data
requirements for the chip erase command sequence.
When the Embedded Erase algorithm is complete, that bank returns to the read mode and ad-
dresses are no longer latched. The system can determine the status of the erase operation by
using DQ7 or DQ6/DQ2. Refer to “Write Operation Status” for information on these status bits.
Any commands written during the chip erase operation are ignored. However, note that a hard-
ware reset immediately terminates the erase operation. If that occurs, the chip erase command
sequence should be reinitiated once that bank has returned to reading array data, to ensure data
integrity.
The following is a C source code example of using the chip erase function. Refer to the Span-
sion 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: Chip Erase Command */
/* Note: Cannot be suspended
*/
*( (UINT16 *)base_addr + 0x555 ) = 0x00AA;
/* write unlock cycle 1
*/
*( (UINT16 *)base_addr + 0x2AA ) = 0x0055;
/* write unlock cycle 2
*/
*( (UINT16 *)base_addr + 0x555 ) = 0x0080;
/* write setup command
*/
*( (UINT16 *)base_addr + 0x555 ) = 0x00AA;
/* write additional unlock cycle 1 */
*( (UINT16 *)base_addr + 0x2AA ) = 0x0055;
/* write additional unlock cycle 2 */
*( (UINT16 *)base_addr + 0x000 ) = 0x0010;
/* write chip erase command
*/
10.5.5
Erase Suspend/Erase Resume Commands
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. 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 min-
imum tSEA time-out period during the sector erase command sequence. The Erase Suspend
command is ignored if written during the chip erase operation.
When the Erase Suspend command is written after the tSEA time-out period has expired and dur-
ing the sector erase operation, the device requires a maximum of tESL (erase suspend latency) to
suspend the erase operation. Additionaly, when an Erase Suspend command is written during an
active erase operation, status information is unavailable during the transition from the sector
erase operation to the erase suspended state.
Table 10.16 Software Functions and Sample Code
Cycle
Description
Operation
Byte Address
Word Address
Data
1
Unlock
Write
Base + AAAh
Base + 555h
00AAh
2
Unlock
Write
Base + 554h
Base + 2AAh
0055h
3
Setup Command
Write
Base + AAAh
Base + 555h
0080h
4
Unlock
Write
Base + AAAh
Base + 555h
00AAh
5
Unlock
Write
Base + 554h
Base + 2AAh
0055h
6
Chip Erase Command
Write
Base + AAAh
Base + 555h
0010h


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