AM29F040B-1 Advanced Micro Devices, AM29F040B-1 Datasheet - Page 12

• Manufacturer Part Number: AM29F040B-1
• Description: 4 Megabit (512 K x 8-Bit) CMOS 5.0 Volt-only/ Uniform Sector Flash Memory
• Manufacturer: Advanced Micro Devices

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.
Notes:
1. See Table 1 for description of bus operations.
2. All values are in hexadecimal.
3. Except when reading array or autoselect data, all bus cycles
4. Address bits A18–A11 are don’t cares for unlock and
5. No unlock or command cycles required when reading array
6. The Reset command is required to return to reading array
12
Read (Note 5)
Reset (Note 6)
Program
Chip Erase
Sector Erase
Erase Suspend (Note 9)
Erase Resume (Note 10)
Autoselect
(Note 7)
are write operations.
command cycles, unless SA or PA required.
data.
data when device is in the autoselect mode, or if DQ5 goes
high (while the device is providing status data).
Command
Sequence
(Note 1)
Manufacturer ID
Device ID
Sector Protect Verify
(Note 8)
1
1
4
4
4
4
6
6
1
1
Table 4. Am29F040B Command Definitions
Addr
XXX
XXX
XXX
555
555
555
555
555
555
RA
First
P R E L I M I N A R Y
Data
RD
AA
AA
AA
AA
AA
AA
F0
B0
30
Addr
2AA
2AA
2AA
2AA
2AA
2AA
Am29F040B
Second
Data
55
55
55
55
55
55
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 A18–A16 select a unique sector.
7. The fourth cycle of the autoselect command sequence is a
8. The data is 00h for an unprotected sector and 01h for a
9. The system may read and program in non-erasing sectors, or
10. The Erase Resume command is valid only during the Erase
read cycle.
protected sector. See “Autoselect Command Sequence” for
more information.
enter the autoselect mode, when in the Erase Suspend
mode. The Erase Suspend command is valid only during a
sector erase operation.
Suspend mode.
Addr
555
555
555
555
555
555
Bus Cycles (Notes 2–4)
Third
Data Addr
A0
90
90
90
80
80
X00
X01
X02
555
555
SA
PA
Fourth
XX00
XX01
Data
PD
AA
A4
AA
01
Addr Data
2AA
2AA
Fifth
55
55
Addr
555
SA
Sixth
Data
10
30