M58WT032KB datasheet(51/117 Pages) NUMONYX

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M58WTxxxKT, M58WTxxxKB

Dual operations and multiple bank architecture

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Dual operations and multiple bank architecture

The multiple bank architecture of the M58WTxxxKT/B provides flexibility for software

developers by allowing code and data to be split with 4 Mbit granularity. The dual operations

feature simplifies the software management of the device and allows 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 that is

programming or erasing, the program or erase operation can be suspended. Also, if the

suspended operation is erase then a program command can be issued to another block.

This means 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. The combination of these features

means that read operations are possible at any moment.

Dual operations between the parameter bank and either the CFI, OTP, or the electronic

signature memory space are not allowed. Table 15, however, shows dual operations that are

allowed between the CFI, OTP, electronic signature locations, and the memory array.

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

For a complete list of possible commands refer to Appendix D: Command interface state

tables.

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

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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