AM29LV642D AMD [Advanced Micro Devices], AM29LV642D Datasheet - Page 32

• Manufacturer Part Number: AM29LV642D
• Manufacturer: AMD [Advanced Micro Devices]

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# (or CE2#) pulse, whichever
happens later.
Notes:
1.
2. All values are in hexadecimal.
3. Except for the read cycle and the fourth cycle of the autoselect
4. Data bits DQ15–DQ8 are don’t care in command sequences,
5. Unless otherwise noted, address bits A21–A15 are don’t cares.
6. No unlock or command cycles required when device is in read
7. The Reset command is required to return to the read mode (or to
8. The fourth cycle of the autoselect command sequence is a read
30
Read (Note 6)
Reset (Note 7)
Enter SecSi Sector Region
Exit SecSi Sector Region
Program
Unlock Bypass
Unlock Bypass Program (Note 10)
Unlock Bypass Reset (Note 11)
Chip Erase
Sector Erase
Erase Suspend (Note 12)
Erase Resume (Note 13)
CFI Query (Note 14)
See Table 1 for description of bus operations.
command sequence, all bus cycles are write cycles.
except for RD and PD.
mode.
the erase-suspend-read mode if previously in Erase Suspend)
when the device is in the autoselect mode, or if DQ5 goes high
(while the device is providing status information).
cycle. See the Autoselect Command Sequence section for more
information.
Manufacturer ID
Device ID
Sector Group Protect Verify
(Note 9)
Command
Sequence
(Note 1)
3
2
2
1
1
4
4
4
3
4
4
6
6
1
1
1
Table 10. Am29LV642D Command Definitions
Addr
XXX
XXX
XXX
555
555
555
555
555
555
555
555
555
RA
BA
BA
55
First
Data
RD
AA
AA
AA
AA
AA
AA
AA
AA
AA
F0
A0
B0
90
30
98
D A T A
Addr
2AA
2AA
2AA
2AA
2AA
2AA
2AA
XXX
2AA
2AA
PA
Second
Am29LV642D
Data
PD
55
55
55
55
55
55
55
00
55
55
S H E E T
PD = Data to be programmed at location PA. Data latches on the rising
edge of WE# or CE# (or CE2#) pulse, whichever happens first.
SA = Address of the sector to be verified (in autoselect mode) or
erased. Address bits A21–A15 uniquely select any sector.
9. The data is 00h for an unprotected sector group and 01h for a
10. The Unlock Bypass command is required prior to the Unlock
11. The Unlock Bypass Reset command is required to return to the
12. The system may read and program in non-erasing sectors, or
13. The Erase Resume command is valid only during the Erase
14. Command is valid when device is ready to read array data or when
Addr
555
555
555
555
555
555
555
555
555
Third
Bus Cycles (Notes 2–5)
protected sector group.
Bypass Program command.
read mode when the device is in the unlock bypass mode.
enter the autoselect mode, when in the Erase Suspend mode.
The Erase Suspend command is valid only during a sector erase
operation.
Suspend mode.
device is in autoselect mode.
Data
A0
90
90
90
88
90
20
80
80
(SA)X02
Addr
XXX
X00
X01
555
555
PA
Fourth
XX00/
22D7
XX01
Data
0001
PD
AA
AA
00
Addr
2AA
2AA
Fifth
25022A2 May 5, 2006
Data
55
55
Addr
555
SA
Sixth
Data
10
30