MBM29F800BA Просмотр технического описания (PDF) - Fujitsu
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MBM29F800BA Datasheet PDF : 48 Pages
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MBM29F800TA-55/-70/-90/MBM29F800BA-55/-70/-90
Table 7 MBM29F800TA/BA Command Definitions
Command
Sequence
Bus
Write
Cycles
First Bus
Write Cycle
Second
Bus
Write Cycle
Third Bus
Write Cycle
Fourth Bus
Read/Write
Cycle
Fifth Bus
Write Cycle
Sixth Bus
Write Cycle
Req'd Addr Data Addr Data Addr Data Addr Data Addr Data Addr Data
Word
Read/Reset
1 XXXH F0H — — — — — — — — — —
Byte
Word
555H
2AAH
555H
Read/Reset
3
AAH
55H
F0H RA RD — — — —
Byte
AAAH
555H
AAAH
Word
555H
2AAH
555H
Autoselect
3
AAH
55H
90H — — — — — —
Byte
AAAH
555H
AAAH
Byte/Word
Program
Word
Byte
4
555H
2AAH
555H
AAH
55H
A0H PA
AAAH
555H
AAAH
PD
—
—
—
—
Word
555H
2AAH
555H
555H
2AAH
555H
Chip Erase
6
AAH
55H
80H
AAH
55H
10H
Byte
AAAH
555H
AAAH
AAAH
555H
AAAH
Sector
Erase
Word
555H
2AAH
555H
555H
2AAH
6
AAH
55H
80H
AAH
55H SA 30H
Byte
AAAH
555H
AAAH
AAAH
555H
Sector Erase Suspend Erase can be suspended during sector erase with Addr (“H” or “L”). Data (B0H)
Sector Erase Resume
Erase can be resumed after suspend with Addr (“H” or “L”). Data (30H)
Notes: 1. Address bits A18 to A11 = X = “H” or “L” for all address commands except or Program Address (PA) and
Sector Address (SA).
2. Bus operations are defined in Tables 2 and 3.
3. RA = Address of the memory location to be read.
PA = Address of the memory location to be programmed. Addresses are latched on the falling edge of
the WE pulse.
SA = Address of the sector to be erased. The combination of A18, A17, A16, A15, A14, A13, and A12 will
uniquely select any sector.
4. RD = Data read from location RA during read operation.
PD = Data to be programmed at location PA. Data is latched on the falling edge of WE.
5. The system should generate the following address patterns:
Word Mode: 555H or 2AAH to addresses A0 to A10
Byte Mode: AAAH or 555H to addresses A-1 to A10
6. Both Read/Reset commands are functionally equivalent, resetting the device to the read mode.
Command Definitions
Device operations are selected by writing specific address and data sequences into the command register.
Writing incorrect address and data values or writing them in the improper sequence will reset the device to the
read mode. Table 7 defines the valid register command sequences. Note that the Erase Suspend (B0H) and
Erase Resume (30H) commands are valid only while the Sector Erase operation is in progress. Moreover both
Read/Reset commands are functionally equivalent, resetting the device to the read mode. Please note that
commands are always written at DQ0 to DQ7 and DQ8 to DQ15 bits are ignored.
Read/Reset Command
The read or eset operation is initiated by writing the Read/Reset command sequence into the command register.
Microprocessor read cycles retrieve array data from the memory. The devices remain enabled for reads until the
command register contents are altered.
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