AT45DB321E datasheet(39/80 Pages) RENESAS

39 / 80 page

DS-AT45DB321E-8784 Rev. N

Page 39

9/1/23

AT45DB321E Datasheet

a buffer and then program the data from the buffer back into same page of main memory. The operation is

internally self-timed and takes place in a maximum time of tEP. During this time, the RDY/BUSY Status Register

indicates that the part is busy.

If a sector is programmed or reprogrammed sequentially page by page and the possibility does not exist that there

is going to be a page or pages of static data, then the programming algorithm shown in Figure 50 is

recommended. Otherwise, if there is a chance that there could be a page or pages of a sector that contains static

data, then the programming algorithm shown in Figure 51 is recommended.

Contact Renesas Electronics for availability of devices that are specified to exceed the 50,000 cycle cumulative

limit.

9.4

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 is constantly being updated, so each

repeating sequence might output new data. The RDY/BUSY status is available for both bytes of the Status

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.

Table 20. Status Register Format – Byte 1

1. R = Readable only.

Bit

Name

Type1

Description

7RDY/BUSY Ready/Busy Status

Device is busy with an internal operation.

Device is ready.

COMP

Compare Result

Main memory page data matches buffer data.

Main memory page data does not match buffer data.

5:2

DENSITY

Density Code

1101 32-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 (528 bytes).

Device is configured for “power of 2” binary page size (512 bytes).

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