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)： 87/95頁
文件大?。?/td> 1745K
代理商： S29WS128N0LBFW010
88
S29WSxxxN_00_F0 October 29, 2004
Pr e l i m i n a r y
12.1 Common Flash Memory Interface
The Common Flash Interface (CFI) specification outlines device and host system software in-
terrogation handshake, which allows specific vendor-specified soft-ware algorithms to be
used for entire families of devices. Software support can then be device-independent, JEDEC
ID-independent, and forward- and back-ward-compatible for the specified flash device fami-
lies. Flash vendors can standardize their existing interfaces for long-term compatibility.
This device enters the CFI Query mode when the system writes the CFI Query command, 98h,
to address (BA)555h any time the device is ready to read array data. The system can read
CFI information at the addresses given in Tables 12.3–12.6) within that bank. All reads out-
side of the CFI address range, within the bank, will return non-valid data. Reads from other
banks are allowed, writes are not. To terminate reading CFI data, the system must write the
reset command.
The following is a C source code example of using the CFI Entry and Exit functions. 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: CFI Entry command */
*( (UINT16 *)bank_addr + 0x555 ) = 0x0098;
/* write CFI entry command
*/
/* Example: CFI Exit command
*/
*( (UINT16 *)bank_addr + 0x000 ) = 0x00F0;
/* write cfi exit command
*/
For further information, please refer to the CFI Specification (see JEDEC publications JEP137-
A and JESD68.01and CFI Publication 100). Please contact your sales office for copies of these
documents.
Table 12.3. CFI Query Identification String
Addresses
Data
Description
10h
11h
12h
0051h
0052h
0059h
Query Unique ASCII string “QRY”
13h
14h
0002h
0000h
Primary OEM Command Set
15h
16h
0040h
0000h
Address for Primary Extended Table
17h
18h
0000h
Alternate OEM Command Set (00h = none exists)
19h
1Ah
0000h
Address for Alternate OEM Extended Table (00h = none exists)
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