To access the autoselect codes in-system, the host
system can issue the autoselect command via the
command register, as shown in Table 12. This method
does not require VID. Refer to the Autoselect Com-
mand Sequence section for more information.
Table 5. Am29DL640H Autoselect Codes, (High Voltage Method)
DQ15 to DQ8
A21 A11
to to
A8
to
A5
to
DQ7
to
BYTE# BYTE#
Description
CE# OE# WE# A12 A10 A9 A7 A6 A4 A3 A2 A1 A0
= VIH
= VIL
DQ0
Manufacturer ID:
AMD
VID
L
L
H
BA
BA
X
X
X
X
L
X
X
L
L
L
L
X
X
01h
Read Cycle 1
Read Cycle 2
Read Cycle 3
L
L
L
L
H
H
L
H
H
L
H
H
H
L
22h
22h
22h
7Eh
02h
01h
VID
L
L
H
X
H
Sector Protection
Verification
01h (protected),
00h (unprotected)
VID
VID
L
L
L
L
H
H
SA
BA
X
X
X
X
L
L
X
X
L
L
L
L
H
H
L
X
X
X
X
Secured Silicon
Indicator Bit (DQ6,
DQ7)
81h (factory locked),
01h (customer and
factory locked)
H
Legend: L = Logic Low = VIL, H = Logic High = VIH, BA = Bank Address, SA = Sector Address, X = Don’t care
.
14
Am29DL640H
June 7, 2005
SPANSION [ SPANSION ]
