參數(shù)資料
型號(hào)： S29WS128N0LBFI110
廠商： Spansion Inc.
英文描述： 256/128/64 MEGABIT CMOS 1.8 VOLT ONLY SIMULTANEOUS READ/WRITE BURST MODE FLASH MEMORY
中文描述： 256/128/64兆位的CMOS 1.8伏只有同時(shí)讀/寫突發(fā)模式閃存
文件頁(yè)數(shù)： 24/99頁(yè)
文件大?。?/td> 1091K
代理商： S29WS128N0LBFI110
28
S29WS-N_00_G0 January 25, 2005
Adva nce
Information
7.5
Program/Erase Operations
These devices are capable of several modes of programming and or erase operations which are
described in detail in the following sections. However, prior to any programming and or erase op-
eration, devices must be setup appropriately as outlined in the configuration register (Table 7.8).
For any program and or erase operations, including writing command sequences, the system
must drive AVD# and CE# to VIL, and OE# to VIH when providing an address to the device, and
drive WE# and CE# to VIL, and OE# to VIH when writing commands or programming data.
Addresses are latched on the last falling edge of WE# or CE#, while data is latched on the 1st
rising edge of WE# or CE#.
Note the following:
When the Embedded Program algorithm is complete, the device returns to the read
mode.
The system can determine the status of the program operation by using DQ7 or DQ6.
Refer to the Write Operation Status section for information on these status bits.
A “0” cannot be programmed back to a “1.” Attempting to do so causes the device to set
DQ5 = 1 (halting any further operation and requiring a reset command). A succeeding
read shows that the data is still “0.” Only erase operations can convert a “0” to a “1.”
Any commands written to the device during the Embedded Program Algorithm are ig-
nored except the Program Suspend command.
Secured Silicon Sector, Autoselect, and CFI functions are unavailable when a program op-
eration is in progress.
A hardware reset immediately terminates the program operation and the program com-
mand sequence should be reinitiated once the device has returned to the read mode, to
ensure data integrity.
Programming is allowed in any sequence and across sector boundaries for single word
programming operation.
7.5.1.
Single Word Programming
Single word programming mode is the simplest method of programming. In this mode, four Flash
command write cycles are used to program an individual Flash address. The data for this pro-
gramming operation could be 8-, 16- or 32-bits wide. While this method is supported by all
Spansion devices, in general it is not recommended for devices that support Write Buffer Pro-
gramming. See Table 12.1 for the required bus cycles and Figure 7.3 for the flowchart.
When the Embedded Program algorithm is complete, the device then returns to the read mode
and addresses are no longer latched. The system can determine the status of the program oper-
ation by using DQ7 or DQ6. Refer to the Write Operation Status section for information on these
status bits.
During programming, any command (except the Suspend Program command) is ignored.
The Secured Silicon Sector, Autoselect, and CFI functions are unavailable when a program
operation is in progress.
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