M58WR064B datasheet(32/81 Pages) STMICROELECTRONICS

32 / 81 page

M58WR064T, M58WR064B

32/81

Synchronous Single Reads are used to read the

Electronic Signature, Status Register, CFI, Block

Protection Status, Configuration Register Status

or Protection Register. When the addressed bank

is in Read CFI, Read Status Register or Read

Electronic Signature mode, the WAIT signal is al-

ways asserted.

See Table 21, Synchronous Read AC Character-

istics and Figure 13, Single Synchronous Read AC

Waveform for details.

DUAL OPERATIONS AND MULTIPLE BANK ARCHITECTURE

The Multiple Bank Architecture of the M58WR064

provides flexibility for software developers by al-

lowing code and data to be split with 4Mbit granu-

larity. 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 pro-

gramming or erasing in one bank, Read opera-

tions 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 re-

quired in a bank which is programming or erasing,

the Program or Erase operation can be suspend-

ed. Also if the suspended operation was Erase

then a Program command can be issued to anoth-

er block, so the device can have one block in

Erase Suspend mode, one programming and oth-

er banks in Read mode. Read Array commands

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.

Tables 11 and 12 show the dual operations possi-

ble in other banks and in the same bank. Note that

only the commonly used commands are repre-

sented in these tables. For a complete list of pos-

sible commands refer to Appendix D, Command

Interface State Tables.

Table 11. Dual Operations Allowed In Other Banks

Table 12. 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 allowe d in another bank

Read

Array

Read

Status

Read

CFI

Query

Read

Electronic

Signature

Program

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

Sign ature

Program

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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