GD25B257D datasheet(16/92 Pages) GIGADEVICE

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3.3V Uniform Sector

Dual and Quad Serial Flash

GD25B257D

7.2.

Extended Address Register

Table 11. Extended Address Register

No.

Name

Description

Note

EA0

A24

Address bit

Volatile writable

EA1

Reserved

EA2

ECS

ECC Correction Signal bit

Volatile writable

EA3

DLP

Data Learning Pattern Enable bit

Volatile writable

EA4

Reserved

EA5

Reserved

EA6

DED

Double Error Detection bit

Volatile, read only

EA7

SEC

Single Error Correction bit

Volatile, read only

In addition to the Status Registers, GD25B257D provides a volatile Extended Register which consists of the

configuration bits for advanced features and the MSB address bit A24. Upon power up or after the execution of a

Software/Hardware Reset, the Extended Register values will be cleared to 0. There are two different commands to write

the Extended Register. 56H is used to write EA5-EA2 bits, A24 value will not be changed. To change A24 bit setting, C5H

should be used, and EA5-EA2 bit values will not be affected.

A24 bit

The Extended Address Bit A24 is used only when the device is operating in the 3-Byte Address Mode (ADS=0), which

is volatile writable by C5H command. The lower 128Mb memory array (00000000H

– 00FFFFFFH) is selected when A24=0,

and all instructions with 3-Byte addresses will be executed within that region. When A24=1, the upper 128Mb memory array

(01000000H

– 01FFFFFFH) will be selected.

If the device powers up with ADP bit

set to 1, or an “Enter 4-Byte Address Mode (B7H)” instruction is issued, the

device will require 4-Byte address input for all address related instructions, and the Extended Address Bit A24 setting will

be ignored. However, any instruction with 4-Byte address input will replace the Extended Address Bit A24 with new settings.

SEC, DED bits

SEC (Single Error Correction) and DED (Double Error Detection) Status Bits are used to show the ECC results for the

last Read operation. SEC and DED bits will be cleared to 0 once the device accepts a new Read command.

SEC, DED

Definitions

No ECC events in all aligned 8-Byte granularities

SEC events in single or multiple 8-Byte granularities, and the data is OK to use.

(Unless it contains more than one odd bit errors in 8-Byte granularity)

DED events in single or multiple 8-Byte granularities, and the data contains 2 or more

even bit errors.

Both SEC & DED occurred in multiple 8-Byte granularities, and the data contains 2

or more bit errors.

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