P r e l i m i n a r y
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. Table
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 1. S29JL064H Device Bus Operations
DQ15–DQ8
Operation
Read
Write
Standby
Output Disable
Reset
Sector Protect (Note 2)
Sector Unprotect (Note 2)
Temporary Sector
Unprotect
CE#
L
L
V
CC
±
0.3 V
L
X
L
L
X
OE# WE# RESET#
L
H
X
H
X
H
H
X
H
L
X
H
X
L
L
X
H
H
V
CC
±
0.3 V
H
L
V
ID
V
ID
V
ID
WP#/ACC
L/H
L/H
L/H
L/H
L/H
Addresses
A
IN
A
IN
X
X
X
SA, A6 = L,
A1 = H, A0 = L
SA, A6 = H,
A1 = H, A0 = L
A
IN
BYTE#
= V
IH
D
OUT
D
IN
High-Z
High-Z
High-Z
X
X
D
IN
BYTE#
= V
IL
DQ14–DQ8 = High-
Z, DQ15 = A-1
High-Z
High-Z
High-Z
X
X
High-Z
DQ7–
DQ0
D
OUT
D
IN
High-Z
High-Z
High-Z
D
IN
D
IN
D
IN
Legend:
L = Logic Low = V
IL
, H = Logic High = V
IH
, V
ID
= 11.5–12.5 V, V
HH
= 9.0 ± 0.5 V, X = Don’t Care, SA = Sector
Address, A
IN
= Address In, D
IN
= Data In, D
OUT
= Data Out
Notes:
1. Addresses are A21:A0 in word mode (BYTE# = V
IH
), A21:A-1 in byte mode (BYTE# = V
IL
).
2. The sector protect and sector unprotect functions may also be implemented via programming equipment. See
the “Sector/Sector Block Protection and Unprotection” section.
3. If WP#/ACC = V
IL
, sectors 0, 1, 140, and 141 remain protected. If WP#/ACC = V
IH
, protection on sectors 0, 1, 140,
and 141 depends on whether they were last protected or unprotected using the method described in “Sector/Sector
HH
, all sectors will be unprotected.
10
S29JL064H
S29JL064HA1 March 26, 2004
SPANSION [ SPANSION ]
