M58LR128FT datasheet(32/82 Pages) STMICROELECTRONICS

32 / 82 page

M58LR128FT, M58LR128FB

32/82

DUAL OPERATIONS AND MULTIPLE BANK ARCHITECTURE

The

Multiple

Bank

Architecture

the

M58LR128FT/B gives greater flexibility for soft-

ware developers to split the code and data spaces

within the memory array. The Dual Operations fea-

ture simplifies the software management of the de-

vice by allowing code to be executed from one

bank while another bank is being programmed or

erased.

The Dual Operations feature means that while pro-

gramming 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 pro-

gram or erase mode).

If a read operation is required in a bank, which is

programming or erasing, the program or erase op-

eration 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.

Bus Read operations are allowed in another bank

between setup and confirm cycles of program or

erase operations.

By using a combination of these features, read op-

erations are possible at any moment in the

M58LR128FT/B device.

Tables 12 and 13 show the dual operations possi-

ble in other banks and in the same bank.

Table 12. Dual Operations Allowed In Other Banks

Table 13. Dual Operations Allowed In Same Bank

Note: 1. Not allowed in the Block or Word that is being erased or programmed.

2. The Read Array command is accepted but the data output is not guaranteed until the Program or Erase has completed.

Status of bank

Commands allowed in another bank

Read

Array

Read

Status

Read

CFI

Query

Read

Electronic

Signature

Program,

Buffer Program

Block

Erase

Program/

Erase

Suspend

Program/

Erase

Resume

Idle

Yes

Programming

Yes

–

Yes

–

Erasing

Yes

–

Yes

–

Program Suspended

Yes

–

Yes

Erase Suspended

Yes

–

Yes

Status of bank

Commands allowed in same bank

Read

Array

Read

Status

Read

CFI Query

Read

Electronic

Signature

Program,

Buffer

Program

Block

Erase

Program/

Erase

Suspend

Program/

Erase

Resume

Idle

Yes

Programming

–(2)

Yes

–

Yes

–

Erasing

–(2)

Yes

–

Yes

–

Program Suspended

Yes(1)

Yes

–

Yes

Erase Suspended

Yes(1)

Yes

Yes(1)

––

Yes

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