P R E L I M I N A R Y
Table 14. Command Definitions (Flash Word Mode)
Bus Cycles (Notes 2–5)
Command
Sequence
(Note 1)
First
Second
Third
Addr
Fourth
Fifth
Sixth
Addr Data Addr Data
Data
Addr
Data
Addr Data Addr Data
Read (Note 6)
Reset (Note 7)
Manufacturer ID
1
1
4
4
RA
XXX
555
555
RD
F0
AA
AA
2AA
2AA
55
55
(BA)555
(BA)555
90
90
(BA)X00
0001
Device ID
(BA)X01 see Table 15
SecSi Sector Factory
Protect (Note 9)
4
4
555
555
AA
AA
2AA
2AA
55
55
(BA)555
(BA)555
90
90
(BA)X03 0082/0002
Sector Protect Verify
(Note 10)
(SADD)
0000/0001
X02
Enter SecSi Sector Region
Exit SecSi Sector Region
Program
3
4
4
3
555
555
555
555
AA
AA
AA
AA
2AA
2AA
2AA
2AA
55
55
55
55
555
555
555
555
88
90
A0
20
XXX
PA
00
PD
Unlock Bypass
Unlock Bypass Program
(Note 11)
2
XXX
A0
PA
PD
Unlock Bypass Reset (Note 12)
Chip Erase
2
6
6
1
1
1
BA
555
555
BA
BA
55
90
AA
AA
B0
30
98
XXX
2AA
2AA
00
55
55
555
555
80
80
555
555
AA
AA
2AA
2AA
55
55
555
10
30
Sector Erase
SADD
Erase Suspend (Note 13)
Erase Resume (Note 14)
CFI Query (Note 15)
Legend:
X = Don’t care
PD = Data to be programmed at location PA. Data latches on the rising
edge of WE# or CE#f pulse, whichever happens first.
RA = Address of the memory location to be read.
RD = Data read from location RA during read operation.
SADD = Address of the sector to be verified (in autoselect mode) or
erased. Address bits A20–A12 uniquely select any sector.
BA = Address of the bank that is being switched to autoselect mode, is
in bypass mode, or is being erased.
PA = Address of the memory location to be programmed. Addresses
latch on the falling edge of the WE# or CE#f pulse, whichever happens
later.
Notes:
1. See Table 1 for description of bus operations.
11. The Unlock Bypass command is required prior to the Unlock
Bypass Program command.
2. All values are in hexadecimal.
12. The Unlock Bypass Reset command is required to return to
reading array data when the bank is in the unlock bypass mode.
3. Except for the read cycle and the fourth cycle of the autoselect
command sequence, all bus cycles are write cycles.
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, and requires the bank address.
4. Data bits DQ15–DQ8 are don’t care in command sequences,
except for RD and PD.
5. Unless otherwise noted, address bits A20–A12 are don’t cares.
6. No unlock or command cycles required when bank is in read
mode.
14. The Erase Resume command is valid only during the Erase
Suspend mode, and requires the bank address.
7. The Reset command is required to return to reading 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).
15. Command is valid when device is ready to read array data or when
device is in autoselect mode.
8. The fourth cycle of the autoselect command sequence is a read
cycle. The system must provide the bank address to obtain the
manufacturer ID, device ID, or SecSi Sector factory protect
information. See the Autoselect Command Sequence section for
more information.
Table 15. Autoselect Device IDs (Word Mode)
Device
Autoselect Device ID
2255h (T), 2256h (B)
2250h (T), 2253h (B)
225Ch (T), 225Fh (B)
Am29DL322G
Am29DL323G
Am29DL324G
9. The data is 82h for factory locked and 02h for not factory locked.
10. The data is 00h for an unprotected sector/sector block and 01h
for a protected sector/sector block.
T = Top Boot Sector, B = Bottom Boot Sector
30
Am49DL32xBG
July 19, 2002
CYPRESS [ CYPRESS ]
