s29as008j Meet Spansion Inc., s29as008j Datasheet - Page 34

• 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.

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,
34
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)
(Note 9)
for description of bus operations.
Table 11.2 S29AS008J Command Definitions (Byte Mode)
1
1
4
6
6
4
4
4
3
4
1
4
3
2
2
6
6
1
1
Addr
XXX
AAA
AAA
AAA
AAA
AAA
AAA
AAA
AAA
AAA
AAA
XXX
XXX
AAA
AAA
XXX
XXX
RA
AA
First
D a t a
Data
RD
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
F0
A0
B0
98
90
30
Addr
XXX
S h e e t
555
555
555
555
555
555
555
555
555
555
555
555
PA
Second
S29AS008J
Data
PD
55
55
55
55
55
55
55
55
55
55
F0
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–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.
( A d v a n c e
Addr
AAA
AAA
AAA
AAA
AAA
AAA
AAA
AAA
AAA
AAA
AAA
AAA
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)X04
Addr
XXX
AAA
AAA
X00
X02
X02
X06
X06
PA
I n f o r m a t i o n )
Fourth
89/09
91/11
00/01
Data
PD
AA
AA
01
7E
7E
00
S29AS008J_00_03 June 6, 2008
Addr
X1C
X1C
555
555
for more information.
Fifth
Data
04
04
55
55
Addr
AAA
X1E
X1E
SA
Sixth
Data
04
03
10
30