S29AL004D SPANSION, S29AL004D Datasheet - Page 27

• Manufacturer Part Number: S29AL004D
• Description: 4 Megabit (512 Kx 8-Bit/256 K x 16-Bit) CMOS 3.0 Volt-only Boot Sector Flash Memory
• Manufacturer: SPANSION

Legend:
X = Don’t care, RA = Address of the memory location to be read, RD = Data read from location RA during read operation, and
PA = Address of the memory location to be programmed. Addresses latch on the falling edge of the WE# or CE# pulse, whichever
happens later. 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 A17–A12 uniquely select any
sector.
Notes:
1. See
2. All values are in hexadecimal.
3. Except when reading array or autoselect data, all bus cycles are write operations.
4. Data bits DQ15–DQ8 are don’t cares for unlock and command cycles.
5. Address bits A17–A11 are don’t cares for unlock and command cycles, unless PA or SA required.
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 is in the autoselect mode, or if DQ5
8. The fourth cycle of the autoselect command sequence is a read cycle.
9. The data is 00h for an unprotected sector and 01h for a protected sector. See “Autoselect Command Sequence” for
10.The Unlock Bypass command is required prior to the Unlock Bypass Program command.
11.The Unlock Bypass Reset command is required to return to reading array data when the device is in the unlock
12.The system may read and program in non-erasing sectors, or enter the autoselect mode, when in the Erase Suspend
13.The Erase Resume command is valid only during the Erase Suspend mode.
February 18, 2005 S29AL004D_00_A1
Sector Erase
Erase Suspend (Note 12)
Erase Resume (Note 13)
goes high (while the device is providing status data).
more information.
bypass mode.
mode. The Erase Suspend command is valid only during a sector erase operation.
Table 1 on page 11
Table 5. S29AL004D Command Definitions (Sheet 2 of 2)
Word
Byte
for description of bus operations.
A d v a n c e
6
1
1
AAA
XXX
XXX
555
AA
B0
30
I n f o r m a t i o n
2AA
555
S29AL004D
55
AAA
555
80
AAA
555
AA
2AA
555
55
SA
30
25