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29F040 Ver la hoja de datos (PDF) - Advanced Micro Devices

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29F040 Datasheet PDF : 30 Pages
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PRELIMINARY
Table 4. Am29F040B Command Definitions
Command
Sequence
(Note 1)
Read (Note 5)
First
Second
Addr Data Addr Data
1 RA RD
Bus Cycles (Notes 2–4)
Third
Fourth
Fifth
Sixth
Addr Data Addr Data Addr Data Addr Data
Reset (Note 6)
1 XXX F0
Manufacturer ID
4 555 AA 2AA 55
555
90 X00 01
Autoselect Device ID
(Note 7)
4 555 AA 2AA 55
555
90 X01 A4
Sector Protect Verify
(Note 8)
4 555
AA
2AA
55
555
90
SA XX00
X02 XX01
Program
Chip Erase
4 555 AA 2AA 55
555
A0 PA PD
6 555 AA 2AA 55
555
80 555 AA 2AA 55 555 10
Sector Erase
Erase Suspend (Note 9)
6 555 AA 2AA 55
555
80 555 AA 2AA 55 SA 30
1 XXX B0
Erase Resume (Note 10)
1 XXX 30
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.
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.
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 write operations.
4. Address bits A18–A11 are don’t cares for unlock and
command cycles, unless SA or PA required.
5. No unlock or command cycles required when reading array
data.
6. The Reset command is required to return to reading array
data when device is in the autoselect mode, or if DQ5 goes
high (while the device is providing status data).
7. The fourth cycle of the autoselect command sequence is a
read cycle.
8. The data is 00h for an unprotected sector and 01h for a
protected sector. See “Autoselect Command Sequence” for
more information.
9. The system may read and program in non-erasing sectors, or
enter the autoselect mode, when in the Erase Suspend
mode. The Erase Suspend command is valid only during a
sector erase operation.
10. The Erase Resume command is valid only during the Erase
Suspend mode.
12
Am29F040B

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