M58WR064HT datasheet(49/111 Pages) NUMONYX

49 / 111 page

M58WR064HT, M58WR064HB

Dual operations and multiple bank architecture

49/111

Dual operations and multiple bank architecture

The Multiple Bank Architecture of the M58WR064HT/B provides flexibility for software

developers by allowing code and data to be split with 4Mbit 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 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. 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 14 however shows dual operations, which

are allowed between the CFI, OTP, Electronic Signature locations and the memory array.

Tables 12 and 13 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 12.

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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