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์ƒ์„ธ๋‚ด์šฉ  Stacked Multi-Chip Product (MCP)
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34
S71WS-Nx0 Based MCPs
S71WS-N_01_A4 September 15, 2005
Ad van c e
Inf o rmation
10.5 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 10.8).
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 โ€œ0โ€ cannot be programmed back to a โ€œ1.โ€ 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 โ€œ0.โ€ Only erase operations can convert a โ€œ0โ€ to a โ€œ1.โ€
Any commands written to the device during the Embedded Program Algorithm are ignored
except the Program Suspend command.
Secured Silicon Sector, Autoselect, and CFI functions are unavailable when a program oper-
ation is in progress.
A hardware reset immediately terminates the program operation and the program command
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 pro-
gramming operation.
10.5.1
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 15.1 for the required bus cycles and Figure 10.3 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 op-
eration is in progress.


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