
July 30, 2002
Am29LV320D
29
Command Definitions
Table 14.
Am29LV320D Command Definitions
Legend:
X = Don’t care
RA = Address of the memory location to be read.
RD = Data read from location RA during read operation.
PA = Address of the memory location to be programmed. Addresses
latch on the falling edge of the WE# or CE# pulse, whichever happens
later.
PD = Data to be programmed at location PA. Data latches on the rising
edge of WE# or CE# pulse, whichever happens first.
SA = Address of the sector to be verified (in autoselect mode) or
erased. Address bits A20–A12 uniquely select any sector.
Notes:
1.
See
Table 1 for description of bus operations.
2.
All values are in hexadecimal.
3.
Except for the read cycle and the fourth cycle of the autoselect
command sequence, all bus cycles are write cycles.
4.
Data bits DQ15–DQ8 are don’t care in command sequences,
except for RD and PD.
5.
Unless otherwise noted, address bits A20–A11 are don’t cares.
6.
No unlock or command cycles required when device is in read
mode.
7.
The Reset command is required to return to the read mode (or to
the erase-suspend-read mode if previously in Erase Suspend)
when a device is in the autoselect mode, or if DQ5 goes high
(while the device is providing status information).
8.
The fourth cycle of the autoselect command sequence is a read
cycle. Data bits DQ15–DQ8 are don’t care. See the
Autoselect9.
The data is 99h for factory locked and 19h for not factory locked.
10. The data is 00h for an unprotected sector and 01h for a protected
sector.
11. The Unlock Bypass command is required prior to the Unlock
Bypass Program command.
12. The Unlock Bypass Reset command is required to return to the
read mode when the device is in the unlock bypass mode.
13. The system may read and program in non-erasing sectors, or
enter the autoselect mode, when in the Erase Suspend mode.
The Erase Suspend command is valid only during a sector erase
operation.
14. The Erase Resume command is valid only during the Erase
Suspend mode.
15. Command is valid when device is ready to read array data or when
device is in autoselect mode.
Command
Sequence
Cycl
e
s
First
Second
Third
Fourth
Fifth
Sixth
Addr
Data
Addr
Data
Addr
Data
Addr
Data
Addr
Data
Addr
Data
1
RA
RD
1
XXX
F0
Aut
o
sel
e
ct
(
Manufacturer ID
Word
4
555
AA
2AA
55
555
90
X00
01
Byte
AAA
555
AAA
Device ID
Word
4
555
AA
2AA
55
555
90
X01
(see
Byte
AAA
555
AAA
X02
SecSi Sector Factory
Word
4
555
AA
2AA
55
555
90
X03
99/19
Byte
AAA
555
AAA
X06
Sector Protect Verify
Word
4
555
AA
2AA
55
555
90
(SA)X02
00/01
Byte
AAA
555
AAA
(SA)X04
Enter SecSi
Sector Region
Word
3
555
AA
2AA
55
555
88
Byte
AAA
555
AAA
Exit SecSi Sector Region
Word
4
555
AA
2AA
55
555
90
XXX
00
Byte
AAA
555
AAA
Program
Word
4
555
AA
2AA
55
555
A0
PA
PD
Byte
AAA
555
AAA
Unlock Bypass
Word
3
555
AA
2AA
55
555
20
Byte
AAA
555
AAA
2
XXX
A0
PA
PD
2
BA
90
XXX
00
Chip Erase
Word
6
555
AA
2AA
55
555
80
555
AA
2AA
55
555
10
Byte
AAA
555
AAA
555
AAA
Sector Erase
Word
6
555
AA
2AA
55
555
80
555
AA
2AA
55
SA
30
Byte
AAA
555
AAA
555
1
BA
B0
1
BA
30
Word
1
55
98
Byte
AA