am42bds640ag Meet Spansion Inc., am42bds640ag Datasheet - Page 31

• Manufacturer Part Number: am42bds640ag
• Description: 64 Megabit 4 M ? 16-bit Cmos 1.8 Volt-only, Simultaneous Operation, Burst Mode Flash Memory And 16 Mbit 1 M ? 16-bit Static Ram Preliminary
• Manufacturer: Meet Spansion Inc.

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 rising edge of the AVD# pulse.
PD = Data to be programmed at location PA. Data latches on the rising
edge of WE# pulse.
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–A12 are don’t cares.
6. No unlock or command cycles required when bank is reading
7. The Reset command is required to return to reading array data
8. The fourth cycle of the autoselect command sequence is a read
9. The data in the fifth cycle is 2204h for top boot, 2224h for bottom
30
Asynchronous Read (6)
Reset (7)
Program
Unlock Bypass
Unlock Bypass Program (12)
Unlock Bypass Sector Erase (12)
Unlock Bypass Chip Erase (12)
Unlock Bypass Reset (13)
Chip Erase
Sector Erase
Erase Suspend (14)
Erase Resume (15)
Sector Lock/Unlock
Set Burst Mode
Configuration Register (16)
CFI Query (17)
See Table 1 for description of bus operations.
command sequence, all bus cycles are write cycles.
except for RD and PD.
array data.
(or to the erase-suspend-read mode if previously in Erase
Suspend) when a bank is in the autoselect mode, or if DQ5 goes
high (while the bank is providing status information) or performing
sector lock/unlock.
cycle. The system must provide the bank address. See the
Autoselect Command Sequence section for more information.
boot.
Manufacturer ID
Device ID (9)
Sector Lock Verify (10)
Handshaking Option (11)
Command Sequence
(Notes)
1
1
4
6
4
4
4
3
2
2
2
2
6
6
1
1
3
3
1
Addr Data Addr Data
XXX
XXX
XXX
XXX
XXX
555
555
555
555
555
555
555
555
555
RA
BA
BA
BA
55
First
Table 14. Command Definitions
RD
AA
AA
AA
AA
AA
AA
AA
A0
AA
AA
B0
F0
80
80
90
30
60
98
P R E L I M I N A R Y
XXX
XXX
XXX
2AA
2AA
2AA
2AA
2AA
2AA
2AA
2AA
2AA
SA
PA
Second
Am42BDS640AG
PD
55
55
55
55
10
60
55
55
55
30
00
55
55
(CR)555
(BA)555
(BA)555
(SA)555
(BA)555
Addr
SLA
555
555
555
555
SA = Address of the sector to be verified (in autoselect mode) or
erased. Address bits A21–A14 uniquely select any sector.
BA = Address of the bank (A21, A20) that is being switched to
autoselect mode, is in bypass mode, or is being erased.
SLA = Address of the sector to be locked. Set sector address (SA) and
either A6 = 1 for unlocked or A6 = 0 for locked.
CR = Configuration Register address bits A19–A12.
10. The data is 0000h for an unlocked sector and 0001h for a locked
11. The data is 0043h for reduced wait-state handshaking and 0042h
12. The Unlock Bypass command sequence is required prior to this
13. The Unlock Bypass Reset command is required to return to
14. The system may read and program in non-erasing sectors, or
15. The Erase Resume command is valid only during the Erase
16. See “Set Burst Mode Configuration Register Command
17. Command is valid when device is ready to read array data or
Third
sector
standard handshaking.
command sequence.
reading array data when the bank 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, and requires the bank address.
Suspend mode, and requires the bank address.
Sequence” for details.
when device is in autoselect mode.
Bus Cycles (Notes 1–5)
Data
A0
C0
90
90
90
90
20
80
80
60
(BA)X00
(BA)X01
(SA)X02
(BA)X03
Addr
555
555
PA
Fourth
0000/0001
0042/0043
0001
227E
Data
PD
AA
AA
Addr
(BA)
X0E
2AA
2AA
Fifth
November 1, 2002
(Note 9)
Data
55
55
Addr
(BA)
X0F
555
SA
Sixth
Data
2201
10
30