M58LT128GS datasheet(45/98 Pages) STMICROELECTRONICS

45 / 98 page

M58LT128GST, M58LT128GSB

8 Dual Operations and Multiple Bank architecture

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Dual Operations and Multiple Bank architecture

The Multiple Bank Architecture of the M58LT128GST and M58LT128GSB 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

M58LT128GST and M58LT128GSB devices.

Dual operations between the Parameter Bank and either of the CFI, or the Electronic Signature

memory space are not allowed. Table 15 shows which dual operations are allowed or not

between the CFI, the Electronic Signature locations and the memory array.

Table 13 and Table 14 show the dual operations possible in other banks and in the same bank.

Table 13.

Dual Operations Allowed In Other Banks

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

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