M29DW641F70N1 NUMONYX [Numonyx B.V], M29DW641F70N1 Datasheet - Page 45

• Manufacturer Part Number: M29DW641F70N1
• Description: 64 Mbit (4Mb x16, Multiple Bank, Page, Boot Block) 3V Supply Flash Memory
• Manufacturer: NUMONYX [Numonyx B.V]

M29DW641F
8
Dual Operations and Multiple Bank architecture
The Multiple Bank architecture of the M29DW641F gives greater flexibility for software
developers to split the code and data spaces within the memory array. The Dual Operations
feature simplifies the software management of the device by allowing code to be executed
from one bank while another bank is being programmed or erased.
The Dual Operations feature means that while programming or erasing in one bank, Read
Operations are possible in another bank with zero latency.
Only one bank at a time is allowed to be in program or erase mode. However, certain
commands can cross bank boundaries, which means that during an operation only the
banks that are not concerned with the cross bank operation are available for Dual
Operations. For example, if a Block Erase command is issued to erase blocks in both Bank
A and Bank B, then only Banks C or D are available for read operations while the erase is
being executed.
If a Read Operation is required in a bank, which is programming or erasing, the Program or
Erase Operation can be suspended.
Also if the suspended operation was erase then a program command can be issued to
another block, so the device can have one block in Erase Suspend mode, one programming
and other banks in read mode.
By using a combination of these features, Read Operations are possible at any moment.
Figure 14
bank. Note that only the commonly used commands are represented in these tables.
Table 14.
1. If several banks are involved in a Program or Erase Operation, then only the banks that are not concerned
2. Read Status Register is not a command. The Status Register can be read during a block Program or Erase
3. Only after a program or Erase Operation in that bank.
4. Only after a Program or Erase Suspend command in that bank.
5. Only a Program Resume is allowed if the bank was previously in Program Suspend mode.
6. Only an Erase Resume is allowed if the bank was previously in Erase Suspend mode.
Idle
Programming
Erasing
Program Suspended
Erase Suspended
Status of bank
with the operation are available for Dual Operations.
Operation.
and
Dual Operations allowed in other banks
Figure 15
(1)
Array
Read
Yes
Yes
Yes
Yes
Yes
show the Dual Operations possible in other banks and in the same
Register
Status
Yes
Read
No
No
No
No
(3)
(2)
Commands allowed in another bank
Query
Read
Dual Operations and Multiple Bank architecture
CFI
Yes
Yes
Yes
No
No
Select
Auto
Yes
Yes
Yes
No
No
Program Erase
Yes
Yes
No
–
–
Yes
No
No
–
–
Suspend
Program
(1)
/Erase
Yes
No
No
–
–
(3)
Program/
Resume
Erase
Yes
Yes
Yes
No
No
45/80
(4)
(5)
(6)