MBM29DL640E Fujitsu Microelectronics, Inc., MBM29DL640E Datasheet - Page 23

• Manufacturer Part Number: MBM29DL640E
• Description: Flash Memory 64 M 8 M X 8/4 M X 16 Bit Dual Operation
• Manufacturer: Fujitsu Microelectronics, Inc.

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
FUNCTIONAL DESCRIPTION
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 8 KB and 15 64 KB; Bank B : 48 64 KB; Bank C : 48 64 KB; Bank D : 8 8 KB and 15 64 KB.
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 Table 9.) 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 Table 10, 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. Table 11 shows
the possible combinations for simultaneous operation. (Refer to Figure 11 Bank-to-Bank Read/Write Timing
Diagram.)
1
2
3
4
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
24 Mbit
32 Mbit
8 Mbit
21
Volume
24 Mbit
24 Mbit
, A
8 Mbit
8 Mbit
20
, A
Bank A
Bank A
Bank D
Bank B
Bank A
Bank B
19
) with zero latency. The device consists of the following four banks :
Bank 1
Table 10 Example of Virtual Banks Combination
Bank 1
Combination
15
30
48
63
Bank C
Bank D
Bank A
Bank B
16
8
8
Table 9 FlexBank
64 Kbyte/32 Kword
64 Kbyte/32 Kword
64 Kbyte/32 Kword 40 Mbit
64 Kbyte/32 Kword
8 Kbyte/4 Kword
Sector Size
8 Kbyte/4 Kword
8 Kbyte/4 Kword
Volume
56 Mbit
40 Mbit
40 Mbit
56 Mbit
TM
Volume Combination
56 Mbit
48 Mbit
32 Mbit
Architecture
MBM29DL640E
Bank B
Bank C
Bank D
Bank B
Bank C
Bank A
Bank C
Bank D
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
Combination
Bank 2
111
96
78
63
16
8
8
64 Kbyte/32 Kword
64 Kbyte/32 Kword
64 Kbyte/32 Kword
8 Kbyte/4 Kword
64 Kbyte/32 Kword
8 Kbyte/4 Kword
Sector Size
8 Kbyte/4 Kword
80/90/12
23