AT25DF641A datasheet(32/58 Pages) DIALOG

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AT25DF641A [DATASHEET]

8793F–DFLASH–11/2017

10.3 Read Sector Lockdown Registers

The Sector Lockdown Registers can be read to determine the current lockdown status of each physical 64KB sector. To

read the Sector Lockdown Register for a particular 64KB sector, the CS pin must first be asserted and then the opcode

35h must be clocked in. Once the opcode has been clocked in, three address bytes designating any address within the

64KB sector must be clocked in. After the address bytes have been clocked in, data will be output on the SO pin during

every subsequent clock cycle. The data being output will be a repeating byte of either FFh or 00h to denote the value of

the appropriate Sector Lockdown Register.

At clock frequencies above fCLK, the first byte of data output will not be valid. Therefore, if operating at clock frequencies

above fCLK, at least two bytes of data must be clocked out from the device in order to determine the correct status of the

appropriate Sector Lockdown Register.

Table 10-2. Read Sector Lockdown Register – Output Data

Deasserting the CS pin will terminate the 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.

Figure 10-3. Read Sector Lockdown Register

Output Data

Sector Lockdown Register Value

00h

Sector Lockdown Register value is 0 (Sector is not locked down).

FFh

Sector Lockdown Register value is 1 (Sector is permanently locked down).

SCK

MSB

00110101

410 11

812

42 43

37 38

31 32

29 30

47 48

Opcode

AAAA

AAA

MSB

XXXXXXXX

MSB

DDDDDDDD

Address Bits A23-A0

Dummy Byte

Data Byte

High-impedance

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