AM29F004B AMD [Advanced Micro Devices], AM29F004B Datasheet - Page 18

• Manufacturer Part Number: AM29F004B
• Description: 4 Megabit (512 K x 8-Bit) CMOS 5.0 Volt-only Boot Sector Flash Memory
• Manufacturer: AMD [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 are
4. Address bits A18–A11 are don’t cares for unlock and command
5. No unlock or command cycles required when reading array data.
6. The Reset command is required to return to reading array data
7. The fourth cycle of the autoselect command sequence is a read
16
Read (Note 5)
Reset (Note 6)
Autoselect
(Note 7)
Program
Chip Erase
Sector Erase
Erase Suspend (Note 11)
Erase Resume (Note 12)
Temporary
Sector
Unprotect
Mode (Note
9)
Sector Unlock (Note 9)
Sector Relock (Notes 9, 10)
write operations.
cycles, except when PA or SA is required.
when device is in the autoselect mode, or if DQ5 goes high (while
the device is providing status data).
cycle.
Command
Manufacturer ID
Device ID,
Top Boot Block
Device ID,
Bottom Boot Block
Sector Protect Verify
(Note 8)
Enter TSU Mode
Program
Sector Erase
Chip Erase
Sequence
(Note 1)
A D V A N C E
1
1
4
4
4
4
4
6
6
1
1
3
2
4
4
3
2
Table 5. Am29F004B Command Definitions
Addr
XXX
XXX
XXX
XXX
XXX
XXX
XXX
555
555
555
555
555
555
555
555
555
RA
First
Data
RD
AA
AA
AA
AA
AA
AA
AA
AA
AA
F0
B0
A0
30
80
80
90
Addr
XXX
XXX
XXX
2AA
2AA
2AA
2AA
2AA
2AA
2AA
2AA
2AA
Am29F004B
PA
Second
I N F O R M A T I O N
Data
PD
AA
AA
55
55
55
55
55
55
55
55
55
00
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–A13 uniquely select any sector.
SA+ = The sector address must be asserted in combination with A0
= 0, A1 = 1, A5 = 1, and A6 = 0 (for protect) or 1 (for unprotect).
8. The data is 00h for an unprotected sector and 01h for a protected
9. To activate the sequence, OE# must be at V
10. The sector relock command in the second cycle may be written
11. The system may read and program in non-erasing sectors, or
12. The Erase Resume command is valid only during the Erase Sus-
sector. See
more information.
as either 00h or F0h.
enter the autoselect mode, when in the Erase Suspend mode.
The Erase Suspend command is valid only during a sector erase
operation.
pend mode.
Addr
XXX
XXX
555
555
555
555
555
555
555
555
555
Bus Cycles (Notes 2–4)
Third
Data
A0
90
90
90
90
80
80
20
55
55
24
Autoselect Command Sequence on page 13
Addr
(SA)
SA+
X00
X01
X01
X02
555
555
555
PA
SA
Fourth
Data
PD
7B
AA
AA
01
77
00
01
30
10
60
Addr
2AA
2AA
SA+
Fifth
Data
55
55
60
ID
.
Addr
SA+
555
SA
Sixth
8/5/05
Data
for
10
30
40