參數(shù)資料
型號： 29PL256N
廠商： Spansion Inc.
英文描述： 256/128/128 Mb (16/8/8 M x 16-Bit) CMOS, 3.0 Volt-only Simultaneous Read/Write, Page-Mode Flash Memory
中文描述： 256/128/128字節(jié)（16/8/8 M中的x 16位），3.0伏的CMOS只同步讀/寫，頁模式閃存
文件頁數(shù)： 23/74頁
文件大小： 1968K
代理商： 29PL256N
June 6, 2007 S29PL-N_00_A5
S29PL-N MirrorBit
Flash Family
23
D a t a
S h e e t
( P r e l i m i n a r y )
7.3
Autoselect
The Autoselect mode allows the host system to access manufacturer and device identification, and verify
sector protection, through identifier codes output from the internal register (separate from the memory array)
on DQ15-DQ0. This mode is primarily intended to allow equipment to automatically match a device to be
programmed with its corresponding programming algorithm. When verifying sector protection, the sector
address must appear on the appropriate highest order address bits (see
Table 7.5)
. The remaining address
bits are don't care. When all necessary bits have been set as required, the programming equipment can then
read the corresponding identifier code on DQ15-DQ0.
The Autoselect codes can also be accessed in-system through the command register. Note that if a Bank
Address (BA) on the four uppermost address bits is asserted during the third write cycle of the Autoselect
command, the host system can read Autoselect data from that bank and then immediately read array data
from the other bank, without exiting the Autoselect mode.
To access the Autoselect codes, the host system must issue the Autoselect command.
The Autoselect command sequence can be written to an address within a bank that is either in the read or
erase-suspend-read mode.
The Autoselect command cannot be written while the device is actively programming or erasing in the other
bank.
Autoselect does not support simultaneous operations or page modes.
The system must write the reset command to return to the read mode (or erase-suspend-read mode if the
bank was previously in Erase Suspend).
See
Table 12.1 on page 66
for command sequence details.
Legend
L = Logic Low = V
IL
BA = Bank Address
Note
For the PL129N either CE1# or CE2# must be low to access Autoselect Codes
H = Logic High = V
IH
SA = Sector Address
X = Don’t care
Table 7.4
Autoselect Codes
Description
CE#
(See Note)
OE#
WE# A
max
–A12
A10
A9
A8
A7
A6
A5 –A4
A3
A2
A1
A0
DQ15 to DQ0
Manufacturer ID
L
L
H
BA
X
X
X
L
L
X
L
L
L
L
0001h
D
Read Cycle 1
L
L
H
BA
X
X
X
L
L
L
L
L
L
H
227Eh
Read Cycle 2
L
H
H
H
L
223Ch (PL256N)
2220h (PL127N)
2221h (PL129N)
Read Cycle 3
L
H
H
H
H
2200h (PL256N)
2200h (PL127N)
2200h (PL129N)
Sector Protection
Verification
L
L
H
SA
X
X
X
L
L
L
L
L
H
L
0000h
Unprotected (Neither DYB nor PPB
Locked)
0001h
Protected (Either DYB or PPB
Locked)
Indicator Bit
L
L
H
BA
X
X
X
L
L
L
L
L
H
H
DQ15 - DQ8 = 0
DQ7 - Factory Lock Bit
1 = Locked
0 = Not Locked
DQ6 -Customer Lock Bit
1 = Locked
0 = Not Locked
DQ5 - Handshake Bit
1 = Reserved
0 = Standard Handshake
DQ4 & DQ3 -WP# Protection Boot Code
00 = WP# Protects both Top Boot
and Bottom Boot Sectors
11 = No WP# Protection
DQ2 - DQ0 = 0
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