A d v a n c e
I n f o r m a t i o n
Device Bus Operations
This section describes the requirements and use of the device bus operations,
which are initiated through the internal command register. The command register
itself does not occupy any addressable memory location. The register is a latch
used to store the commands, along with the address and data information
needed to execute the command. The contents of the register serve as inputs to
the internal state machine. The state machine outputs dictate the function of the
device.
lists the device bus operations, the inputs and control levels they
require, and the resulting output. The following subsections describe each of
these operations in further detail.
Table 3.
Device Bus Operations
DQ8–DQ15
Operation
Read
Write (Program/Erase)
Accelerated Program
Standby
Output Disable
Reset
Sector Group Protect
(Note 2)
Sector Group
Unprotect
(Note 2)
Temporary Sector
Group Unprotect
CE#
L
L
L
V
CC
±
0.3 V
L
X
L
OE# WE# RESET#
L
H
H
X
H
X
H
H
L
L
X
H
X
L
H
H
H
V
CC
±
0.3 V
H
L
V
ID
WP#
X
(Note 3)
(Note 3)
X
X
X
H
ACC
X
X
V
HH
H
X
X
X
Addresses
(Note 1)
A
IN
A
IN
A
IN
X
X
X
DQ0–
DQ7
D
OUT
(Note 4)
(Note 4)
High-Z
High-Z
High-Z
BYTE#
= V
IH
D
OUT
(Note
4)
(Note
4)
High-Z
High-Z
High-Z
X
BYTE#
= V
IL
DQ8–DQ14
= High-Z,
DQ15 = A-1
High-Z
High-Z
High-Z
X
SA, A6 =L,
A3=L, A2=L, (Note 4)
A1=H, A0=L
SA, A6=H,
A3=L, A2=L, (Note 4)
A1=H, A0=L
A
IN
(Note 4)
L
H
L
V
ID
V
ID
H
X
X
(Note
4)
X
X
X
X
H
X
High-Z
Legend:
L = Logic Low = V
IL
, H = Logic High = V
IH
, V
ID
= 11.5–12.5 V, V
HH
= 11.5–12.5 V, X = Don’t Care, SA = Sector
Address, A
IN
= Address In, D
IN
= Data In, D
OUT
= Data Out
Notes:
1. Addresses are Amax:A0 in word mode; Amax:A-1 in byte mode. Sector addresses are Amax:A15 in both modes.
2. The sector protect and sector unprotect functions may also be implemented via programming equipment. See the
“Sector Group Protection and Unprotection” section.
3. If WP# = V
IL
, the first or last sector remains protected (for uniform sector devices), and the two outer boot sectors
are protected (for boot sector devices). If WP# = V
IH
, the first or last sector, or the two outer boot sectors will be
protected or unprotected as determined by the method described in “Sector Group Protection and Unprotection”.
All sectors are unprotected when shipped from the factory (The Secured Silicon Sector may be factory protected
depending on version ordered.)
4. D
IN
or D
OUT
as required by command sequence, data polling, or sector protect algorithm (see
January 28, 2005 S29GLxxxA_00_A2
S29GLxxxA MirrorBit™ Flash Family
19
SPANSION [ SPANSION ]
