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參數(shù)資料
| 型號： | S29WS128N0LBFW010 |
| 廠商： | SPANSION LLC |
| 元件分類： | PROM |
| 英文描述： | 256/128/64 MEGABIT CMOS 1.8 VOLT ONLY SIMULTANEOUS READ/WRITE BURST MODE FLASH MEMORY |
| 中文描述： | 8M X 16 FLASH 1.8V PROM, 70 ns, PBGA84 |
| 封裝： | 11.60 X 8 MM, LEAD FREE, PLASTIC, FBGA-84 |
| 文件頁數(shù)： | 57/95頁 |
| 文件大?。?/td> | 1745K |
| 代理商： | S29WS128N0LBFW010 |
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60
S29WSxxxN_00_F0 October 29, 2004
Pr e l i m i n a r y
10.2 Customer SecSiTM Sector
The Customer SecSi Sector is typically shipped unprotected (DQ6 set to “0”), allowing cus-
tomers to utilize that sector in any manner they choose. If the security feature is not required,
the Customer SecSi Sector can be treated as an additional Flash memory space.
Please note the following:
Once the Customer SecSi Sector area is protected, the Customer Indicator Bit will be per-
manently set to “1.”
The Customer SecSi Sector can be read any number of times, but can be programmed
and locked only once. The Customer SecSi Sector lock must be used with caution as once
locked, there is no procedure available for unlocking the Customer SecSi Sector area and
none of the bits in the Customer SecSi Sector memory space can be modified in any way.
The accelerated programming (ACC) and unlock bypass functions are not available when
programming the Customer SecSi Sector, but reading in Banks 1 through 15 is available.
Once the Customer SecSi Sector is locked and verified, the system must write the Exit
SecSi Sector Region command sequence which return the device to the memory array at
sector 0.
10.3 SecSiTM Sector Entry and SecSi Sector Exit
Command Sequences
The system can access the SecSi Sector region by issuing the three-cycle Enter SecSi Sector
command sequence. The device continues to access the SecSi Sector region until the system
issues the four-cycle Exit SecSi Sector command sequence.
See Command Definition Table [SecSiTM Sector Command Table, Appendix
Table 12.1 for address and data requirements for both command sequences.
The SecSi Sector Entry Command allows the following commands to be executed
Read customer and factory SecSi areas
Program the customer SecSi Sector
After the system has written the Enter SecSi Sector command sequence, it may read the
SecSi Sector by using the addresses normally occupied by sector SA0 within the memory ar-
ray. This mode of operation continues until the system issues the Exit SecSi Sector command
sequence, or until power is removed from the device.
The following are C functions and source code examples of using the SecSi Sector Entry, Pro-
gram, and exit commands. Refer to the Spansion Low Level Driver User’s Guide (available
soon on www.amd.com and www.fujitsu.com) for general information on Spansion Flash
memory software development guidelines.
Note: Base = Base Address.
/* Example: SecSi Sector Entry Command */
Software Functions and Sample Code
Table 10.2. SecSi Sector Entry
(LLD Function = lld_SecSiSectorEntryCmd)
Cycle
Operation
Byte Address
Word Address
Data
Unlock Cycle 1
Write
Base + AAAh
Base + 555h
00AAh
Unlock Cycle 2
Write
Base + 554h
Base + 2AAh
0055h
Entry Cycle
Write
Base + AAAh
Base + 555h
0088h
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