AT45DB641E datasheet(40/78 Pages) RENESAS

40 / 78 page

DS-AT45DB641E-027 Rev. O

Page 40

6/30/23

AT45DB641E Datasheet

10.4 Status Register Read

The 2-byte Status Register can be used to determine the device's ready/busy status, page size, a Main Memory

Page to Buffer Compare operation result, the sector protection status, Freeze Sector Lockdown status,

erase/program error status, Program/Erase Suspend status, and the device density. The Status Register can be

read at any time, including during an internally self-timed program or erase operation.

To read the Status Register, the CS pin must first be asserted and then the opcode D7h must be clocked into the

device. After the opcode has been clocked in, the device begins outputting Status Register data on the SO pin

during every subsequent clock cycle. After the second byte of the Status Register has been clocked out, the

sequence repeats itself, starting again with the first byte of the Status Register, as long as the CS pin remains

asserted and the clock pin is being pulsed. The data in the Status Register are constantly being updated,

consequently, each repeating sequence can output new data. The RDY/BUSY status is available for both bytes of

the Status Register and is updated for each byte.

Deasserting the CS pin terminates the Status Register Read operation and put the SO pin into a high-impedance

state. The CS pin can be deasserted at any time and does not require that a full byte of data be read.

1. R = Readable only.

Table 20. Status Register Format – Byte 1

Bit

Name

Type[1]

Description

RDY/BUSY

Ready/Busy Status

Device is busy with an internal operation.

Device is ready.

COMP

Compare Result

Main memory page data match buffer data.

Main memory page data do not match buffer data.

5:2

DENSITY

Density Code

1111

64-Mbit

PROTECT

Sector Protection Status

Sector protection is disabled.

Sector protection is enabled.

PAGE SIZE

Page Size Configuration

Device is configured for standard DataFlash page size (264 bytes).

Device is configured for “power of 2” binary page size (256 bytes).

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