M58PR256J datasheet(60/114 Pages) STMICROELECTRONICS

60 / 114 page

Dual operations and multiple bank architecture

M58PR256J, M58PR512J

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Dual operations and multiple bank architecture

The Multiple Bank Architecture of the M58PRxxxJ 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).

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.

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 operations are possible at any moment in

the M58PRxxxJ device.

Dual operations between the Extended Flash Array (EFA) and either of the CFI, the OTP or

the Electronic Signature memory space are not allowed. Table 20 shows which dual

operations are allowed or not between the CFI, the OTP, the Electronic Signature locations

and the memory array.

Table 18 and Table 19 show the dual operations possible in other banks and in the same

bank.

Table 18.

Dual operations allowed in other banks

Status of bank

Commands allowed in another bank

Read

Array

Read

Status

Read

CFI

Query

Read

Electronic

Signature

Read

EFA

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

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