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參數(shù)資料
| 型號： | S29AL016D90MAI020 |
| 廠商： | SPANSION LLC |
| 元件分類： | DRAM |
| 英文描述： | 16 MEGABIT CMOS 3.0 VOLT ONLY BOOT SECTOR FLASH MEMORY |
| 中文描述： | 1M X 16 FLASH 3V PROM, 90 ns, PDSO44 |
| 封裝： | 28.20 X 13.30 MM, MO-180AAA, SOP-44 |
| 文件頁數(shù)： | 23/58頁 |
| 文件大?。?/td> | 1037K |
| 代理商： | S29AL016D90MAI020 |
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December 17, 2004 S29AL016D_00_A2
S29AL016D
23
P r e l i m i n a r y
Autoselect Command Sequence
The autoselect command sequence allows the host system to access the manu-
facturer and devices codes, and determine whether or not a sector is protected.
Table 9
shows the address and data requirements. This method is an alternative
to that shown in
Table 4
, which is intended for PROM programmers and requires
V
ID
on address bit A9.
The autoselect command sequence is initiated by writing two unlock cycles, fol-
lowed by the autoselect command. The device then enters the autoselect mode,
and the system may read at any address any number of times, without initiating
another command sequence.
A read cycle at address XX00h retrieves the manufacturer code. A read cycle at
address XX01h returns the device code. A read cycle containing a sector address
(SA) and the address 02h in word mode (or 04h in byte mode) returns 01h if that
sector is protected, or 00h if it is unprotected. Refer to Tables
2
and
3
for valid
sector addresses.
The system must write the reset command to exit the autoselect mode and return
to reading array data.
Word/Byte Program Command Sequence
The system may program the device by word or byte, depending on the state of
the BYTE# pin. Programming is a four-bus-cycle operation. The program com-
mand sequence is initiated by writing two unlock write cycles, followed by the
program set-up command. The program address and data are written next, which
in turn initiate the Embedded Program algorithm. The system is
not
required to
provide further controls or timings. The device automatically generates the pro-
gram pulses and verifies the programmed cell margin.
Table 9
shows the address
and data requirements for the byte program command sequence.
When the Embedded Program algorithm is complete, the device then returns to
reading array data and addresses are no longer latched. The system can deter-
mine the status of the program operation by using DQ7, DQ6, or RY/BY#. See
Write Operation Status
for information on these status bits.
Any commands written to the device during the Embedded Program Algorithm
are ignored. Note that a
hardw are reset
immediately terminates the program-
ming operation. The Byte Program command sequence should be reinitiated once
the device has reset to reading array data, to ensure data integrity.
Programming is allowed in any sequence and across sector boundaries.
A bit
cannot be programmed from a “ 0” back to a “ 1” .
Attempting to do so may
halt the operation and set DQ5 to “1,” or cause the Data# Polling algorithm to
indicate the operation was successful. However, a succeeding read will show that
the data is still “0”. Only erase operations can convert a “0” to a “1”.
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