Cypress Semiconductor S29JL064J, Руководство пользователя

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Document Number: 002-00856 Rev. *E Page 16 of 59
S29JL064J
8.9 Autoselect Mode
The autoselect mode provides manufacturer and device identification, and sector protection verification, through identifier codes
output on DQ7–DQ0. This mode is primarily intended for programming equipment to automatically match a device to be
programmed with its corresponding programming algorithm. However, the autoselect codes can also be accessed in-system
through the command register.
When using programming equipment, the autoselect mode requires V
ID
on address pin A9. Address pins must be as shown in
Table . In addition, when verifying sector protection, the sector address must appear on the appropriate highest order address bits
(see Table on page 15 ). Table shows the remaining address bits that are don’t care. When all necessary bits have been set as
required, the programming equipment may then read the corresponding identifier code on DQ7–DQ0. However, the autoselect
codes can also be accessed in-system through the command register, for instances when the S29JL064J is erased or programmed
in a system without access to high voltage on the A9 pin. The command sequence is illustrated in
Table on page 31 .
Note that if a
Bank Address (BA) on address bits A21, A20, and A19 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 another bank, without exiting the
autoselect mode.
To access the autoselect codes in-system, the host system can issue the autoselect command via the command register, as shown
in
Table on page 31 . This method does not require V
ID
. Refer to
Autoselect Command Sequence
on page 27 for more information.
Legend
L = Logic Low = V
IL
H = Logic High = V
IH
BA = Bank Address
SA = Sector Address
X = Don’t care.
S29JL064J Autoselect Codes, (High Voltage Method)
Description CE# OE# WE#
A21
to
A12
A11
to
A10 A9
A8
to
A7 A6
A5
to
A4 A3 A2 A1 A0
DQ15 to DQ8
DQ7
to
DQ0
BYTE#
= V
IH
BYTE#
= V
IL
Manufacturer ID
:
Spansion Products
L L H BA X V
ID
X L X L L L L X X 01h
Device ID
Read Cycle 1
L L H BA X V
ID
X
L
X
L L L H 22h
X
7Eh
Read Cycle 2 L H H H L 22h 02h
Read Cycle 3 L H H H H 22h 01h
Sector Protection
Verification
L L H SA X V
ID
X L X L L H L X X
01h (protected),
00h (unprotected)
Secured Silicon
Indicator Bit (DQ6,
DQ7)
L L H BA X V
ID
X L X L L H H X X
81h (Factory Locked),
41h (Customer
Locked),
01h (Not Locked)