BUS OPERATION
Table 1. Bus Operations
(1)
OPERATION
Electronic ID Manufacturer Code
(2)
Electronic ID Device Code
(2)
Read
(3)
Standby
Output Disable
Write
Enable Sector Protect
Verify Sector Protect
/CE
L
L
L
H
L
L
L
L
/OE
L
L
L
X
H
H
V
ID
L
/WE
H
H
H
X
H
L
L
H
A0
L
H
A0
X
X
A0
X
L
A1
L
L
A1
X
X
A1
X
H
A6
L
L
A6
X
X
A6
X
L
A9
V
ID
V
ID
A9
X
X
A9
V
ID
V
ID
I/O
Code
Code
D
OUT
High Z
High Z
D
IN(4)
X
Code
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 4.
3. /WE can be V
IL
if /CE is V
IL
, /OE at V
IH
initiates the write operations.
4. Refer to Table 4 for valid D
IN
during a write operation.
Table 2. Sector Protection Verify Electronic ID Codes
Type
A18
A17
A16
A6
A1
A0
Code
HEX
ADH
DQ7
DQ6
DQ5
DQ4
DQ3
DQ2
DQ1
DQ0
Manufacture Code
HY29F040A
Device Code
Sector Protection
X
X
X
V
IL
V
IL
V
IL
V
IL
V
IL
V
IH
V
IL
V
IH
V
IL
1
0
1
0
1
1
0
1
X
X
X
A4H
01H
(1)
1
0
0
0
1
0
0
0
0
0
1
0
0
0
0
1
Sector Addresses
Notes:
1. Outputs 01H at protected sector addresses, and output 00H at unprotected sector addresses.
4
HY29F040A
HYNIX [ HYNIX SEMICONDUCTOR ]
