M29DW128F60NF1 STMICROELECTRONICS [STMicroelectronics], M29DW128F60NF1 Datasheet - Page 49

• Manufacturer Part Number: M29DW128F60NF1
• Description: 128 Mbit (16Mb x8 or 8Mb x16, Multiple Bank, Page, Boot Block) 3V Supply, Flash Memory
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

M29DW128F
8
Dual Operations and Multiple Bank architecture
The Multiple Bank Architecture of the M29DW128F 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.
Table 20
Note that only the commonly used commands are represented in these tables.
Table 20.
1. If several banks are involved in a program or erase operation, then only the banks that are not concerned with
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
the operation are available for dual operations.
operation.
and
Dual Operations Allowed In Other Banks
Table 21
Read/
Reset
Yes
Yes
Yes
Yes
Yes
show the dual operations possible in other banks and in the same bank.
Register
Status
Yes
Read
No
No
No
No
(2)
(3)
Commands allowed in another bank
Query
Read
CFI
Yes
Yes
Yes
No
No
Select
Auto
8 Dual Operations and Multiple Bank architecture
Yes
Yes
Yes
No
No
Program Erase
Yes
Yes
No
–
–
Yes
No
No
–
–
(1)
Program/
Suspend
Erase
Yes
No
No
-
-
(3)
Program
Resume
/Erase
Yes
Yes
Yes
No
No
49/93
(4)
(5)
(6)