
BRIGHT
Microelectronics
Inc.
BM29F400T/BM29F400B
- 4 -
BUS OPERATION
Table 1. Bus Operations
(
BYTE
= V
IH
)
(1)
OPERATION
CE
OE
WE
A0
A1
A6
A9
DQ0-DQ15
RESET
Electronic ID Manufacturer(2)
Electronic ID Device(2)
Read(3)
L
L
H
L
L
L
V
ID
Code
H
L
L
H
H
L
L
V
ID
Code
H
L
L
H
A0
A1
A6
A9
D
OUT
H
Standby
H
X
X
X
X
X
X
High Z
H
Hardware Reset
X
X
X
X
X
X
X
High Z
L
Output Disable
L
H
H
X
X
X
X
High Z
D
IN
(4)
X
Write
Verify Sector Protect(2)
L
H
L
A0
A1
A6
A9
H
L
L
H
L
H
L
V
ID
Code
H
Temporary Sector Unprotect
X
X
X
X
X
X
X
X
V
ID
Notes:
1. L = V
IL
, H = V
IH
, X = Don't Care. See DC Characteristics for voltage levels.
2. Manufacturer and device codes may also be accessed via a command register sequence. Refer to Table 6.
3.
WE
can be V
IL
if CE is V
IL
,
OE
at V
IH
initiates the write operations.
4. Refer to Table 6 for valid DIN during a write operation.
Table 2. Bus Operations
(
BYTE
= V
IL
)
(1)
OPERATION
CE
OE
WE
A0
A1
A6
A9
DQ0-DQ7
DQ8-DQ15
RESET
Electronic ID Manufacturer(2)
Electronic ID Device(2)
Read(3)
L
L
H
L
L
L
V
ID
Code
High Z
H
L
L
H
H
L
L
V
ID
Code
High Z
H
L
L
H
A0
A1
A6
A9
D
OUT
High Z
H
Standby
H
X
X
X
X
X
X
High Z
High Z
H
Hardware Reset
X
X
X
X
X
X
X
High Z
High Z
L
Output Disable
L
H
H
X
X
X
X
High Z
D
IN
(4)
High Z
H
Write
Verify Sector Protect(2)
L
H
L
A0
A1
A6
A9
High Z
H
L
L
H
L
H
L
V
ID
Code
High Z
H
Temporary Sector Unprotect
X
X
X
X
X
X
X
X
High Z
V
ID
Notes:
1. L = V
IL
, H = V
IH
, X = Don't Care. See DC Characteristics for voltage levels.
2. Manufacturer and device codes may also be accessed via a command register sequence. Refer to Table 6.
3.
WE
can be V
IL
if CE is V
IL
,
OE
at V
IH
initiates the write operations.
4. Refer to Table 6 for valid DIN during a write operation.