M29DW128F datasheet(49/93 Pages) STMICROELECTRONICS

49 / 93 page

M29DW128F

8 Dual Operations and Multiple Bank architecture

49/93

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 and Table 21 show the dual operations possible in other banks and in the same bank.

Note that only the commonly used commands are represented in these tables.

Table 20.

Dual Operations Allowed In Other Banks

Status of bank

Commands allowed in another bank(1)

If several banks are involved in a program or erase operation, then only the banks that are not concerned with

the operation are available for dual operations.

Read/

Reset

Read

Status

(2)

Read Status Register is not a command. The Status Register can be read during a block program or erase

operation.

Read

CFI

Query

Auto

Select

Program

Erase

Program/

Erase

Suspend

Program

/Erase

Resume

Idle

Yes

Yes(3)

Yes

Yes(3)

Only after a program or erase operation in that bank.

Yes(4)

Only after a Program or Erase Suspend command in that bank.

Programming

Yes

–

Erasing

Yes

–

Program

Suspended

Yes

Yes(5)

Only a Program Resume is allowed if the bank was previously in Program Suspend mode.

Erase Suspended

Yes

Yes(6)

Only an Erase Resume is allowed if the bank was previously in Erase Suspend mode.

M29DW128F Datasheet(PDF) 49 Page - STMicroelectronics

M29DW128F Datasheet(HTML) 49 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93

Datasheet Download

Link URL