s29as008j Meet Spansion Inc., s29as008j Datasheet - Page 33

• Manufacturer Part Number: s29as008j
• Description: 8 Megabit 1 M X 8-bit/512 K X 16-bit Cmos 1.8 Volt-only Boot Sector Flash Memory
• Manufacturer: Meet Spansion Inc.

11. 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# pulse, whichever happens later.
Notes
1. See
2. All values are in hexadecimal.
3. Except for the read cycle and the fourth cycle of the autoselect command
4. Data bits DQ15–DQ8 are don’t cares for unlock and command cycles.
5. Address bits A18–A11 are don’t cares for unlock and command cycles,
6. No unlock or command cycles required when reading array data.
7. The Reset command is required to return to reading array data when device
8. The fourth cycle of the autoselect command sequence is a read cycle.
9. For top boot, 89h = factory locked, 09h = not factory locked. For bottom boot,
June 6, 2008 S29AS008J_00_03
Read
Reset
Enter Secured Silicon Sector
Exit Secured Silicon Sector
CFI Query
Program
Unlock Bypass
Unlock Bypass Program
Unlock Bypass Reset
Chip Erase
Sector Erase
Erase Suspend
Erase Resume
sequence, all bus cycles are write cycles.
unless SA or PA required.
is in the autoselect mode, or if DQ5 goes high (while the device is providing
status data).
91h = factory locked, 11h = not factory locked.
(Note 6)
Manufacturer ID
Device ID,
Top Boot Block
Device ID,
Bottom Boot Block
Secured Silicon Sector Factory
Protect, Top Boot
Secured Silicon Sector Factory
Protect, Bottom Boot
Sector Protect
(Note 7)
Table 7.1 on page 13
(Note 11)
Command
Sequence
(Note 15)
(Note 1)
(Note 14)
Verify(Note 10)
(Note 13)
(Note 9)
(Note 12)
D a t a
(Note 9)
for description of bus operations.
S h e e t
Table 11.1 S29AS008J Command Definitions (Word Mode)
1
1
4
6
6
4
4
4
3
4
1
4
3
2
2
6
6
1
1
Addr
XXX
XXX
XXX
XXX
XXX
555
555
555
555
555
555
555
555
555
555
555
555
RA
55
First
( A d v a n c e
Data
RD
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
F0
98
A0
90
B0
30
Addr
XXX
2AA
2AA
2AA
2AA
2AA
2AA
2AA
2AA
2AA
2AA
2AA
2AA
PA
Second
S29AS008J
Data
PD
55
55
55
55
55
55
55
55
55
55
F0
55
55
I n f o r m a t i o n )
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–A12 uniquely select any sector.
10. The data is 00h for an unprotected sector and 01h for a protected sector. See
11. Command is valid when device is ready to read array data or when device is
12. The Unlock Bypass command is required prior to the Unlock Bypass Program
13. The Unlock Bypass Reset command is required to return to reading array
14. The system may read and program in non-erasing sectors, or enter the
15. The Erase Resume command is valid only during the Erase Suspend mode.
Addr
555
555
555
555
555
555
555
555
555
555
555
555
Autoselect Command Sequence on page 28
in autoselect mode.
command.
data when the device is in the unlock bypass mode. F0 is also acceptable.
autoselect mode, when in the Erase Suspend mode. The Erase Suspend
command is valid only during a sector erase operation.
Third
Data
Bus Cycles (Notes 2–5)
90
90
90
90
90
90
88
90
A0
20
80
80
(SA)X02
Addr
XXX
X00
X01
X01
X03
X03
555
555
PA
Fourth
XX00/XX01
0089/0009
0091/0011
227E
227E
Data
PD
AA
AA
01
00
Addr
X0E
X0E
2AA
2AA
for more information.
Fifth
Data
2204
2204
55
55
Addr
X0F
X0F
555
SA
Sixth
Data
2204
2203
10
30
33