MBM29QM12DH Fujitsu Microelectronics, Inc., MBM29QM12DH Datasheet - Page 25

• Manufacturer Part Number: MBM29QM12DH
• Description: Page Mode Flash Memory 128m 8m X 16 Bit
• Manufacturer: Fujitsu Microelectronics, Inc.

24
MBM29QM12DH
Simultaneous Operation
Note : When multiple sector erase over several banks is operated, the system cannot read out of the bank to which
Splits
Bank
Splits
Bank
The device features functions that enable reading of data from one memory bank while a program or erase
operation is in progress in the other memory bank (simultaneous operation) , in addition to conventional features
(read, program, erase, erase-suspend read, and erase-suspend program) . The bank can be selected by bank
address (A
Bank A : 8 4 KW and 31 32 KW; Bank B : 96 32 KW; Bank C : 96 32 KW; Bank D : 8 4 KW and 31 32 KW.
The device can execute simultaneous operations between Bank 1, a bank chosen from among the four banks,
and Bank 2, a bank consisting of the three remaining banks. (See “FlexBank
TIONAL DESCRIPTION”.) This is what we call a “FlexBank”, for example, the rest of banks B, C and D to let
the system read while Bank A is in the process of program (or erase) operation. However, the different types of
operations for the three banks are impossible, e.g. Bank A writing, Bank B erasing, and Bank C reading out.
With this “FlexBank”, as described in “Example of Virtual Banks Combination Table” in “
SCRIPTION”, the system gets to select from four combinations of data volume for Bank 1 and Bank 2, which
works well to meet the system requirement. The simultaneous operation cannot execute multi-function mode in
the same bank. “Simultaneous Operation Table” in “ FUNCTIONAL DESCRIPTION” shows the possible com-
binations for simultaneous operation. (Refer to “Bank-to-Bank Read/Write Timing Diagram” in “
GRAM”.)
1
2
3
4
FUNCTIONAL DESCRIPTION
1
2
3
4
a sector being erased belongs. For example, suppose that erasing is taking place at both Bank A and Bank B,
neither Bank A nor Bank B is read out (they would output the sequence flag once they were selected.)
Meanwhile the system would get to read from either Bank C or Bank D.
Volume Combination
16 Mbit
32 Mbit
48 Mbit
64 Mbit
22
Volume
16 Mbit
48 Mbit
48 Mbit
16 Mbit
, A
21
, A
Bank D
Bank A
Bank A
Bank B
Bank A
Bank B
20
) with zero latency. The device consists of the following four banks :
Bank 1
Bank 1
Combination
Example of Virtual Banks Combination Table
Bank C
Bank D
Bank A
Bank B
-60
127
31
62
96
16
FlexBank
8
8
Sector Size
4 Kwords
32 Kwords
32 Kwords
32 Kwords
4 Kwords
4 Kwords
32 Kwords
TM
112 Mbit
112 Mbit
Architecture Table
Volume
80 Mbit
80 Mbit
Volume Combination
Mbits
Mbits
Mbits
Mbits
112
96
80
64
Bank C
Bank D
Bank B
Bank C
Bank D
Bank B
Bank C
Bank A
Bank C
Bank D
Remainder (Bank B, C, D)
Remainder (Bank A, C, D)
Remainder (Bank A, B, D)
Remainder (Bank A, B, C)
Bank 2
TM
Architecture Table” in “ FUNC-
Combination
Bank 2
223
192
158
127
16
8
8
Sector Size
FUNCTIONAL DE-
4 Kwords
4 Kwords
32 Kwords
32 Kwords
4 Kwords
32 Kwords
32 Kwords
TIMING DIA-