Datasheet

ManualsBrandsDIGILENT ManualsDev Kits410-340

READ MEMORY Operations

The device supports default reading and writing to an A[MAX:MIN] of A[23:0] (3-byte

address).

Reading and writing to an A[MAX:MIN] of A[31:0] (4-byte address) is also supported. Se-

lection of the 3-byte or 4-byte address range can be enabled in two ways: setting the

nonvolatile configuration register or entering the ENABLE 4-BYTE ADDRESS MODE or

EXIT 4-BYTE ADDRESS MODE commands. Further details for these settings and com-

mands are in the respective register and command sections of the data sheet.

Note: When the device is set to the default address range of A[23:0], another method for

enabling 4-byte addressing is through the extended address register. Details can be

found in Nonvolatile and Volatile Registers.

3-Byte Address

To execute READ MEMORY commands, S# is driven LOW. The command code is input

on DQn, followed by input on DQn of three address bytes. Each address bit is latched in

during the rising edge of the clock. The addressed byte can be at any location, and the

address automatically increments to the next address after each byte of data is shifted

out; therefore, the entire memory can be read with a single command. The operation is

terminated by driving S# HIGH at any time during data output.

Table 25: Command/Address/Data Lines for READ MEMORY Commands

Note 1 applies to entire table

Command Name

READ

FAST

READ

DUAL OUTPUT

FAST READ

DUAL

INPUT/OUTPUT

FAST READ

QUAD OUTPUT

FAST READ

QUAD

INPUT/OUTPUT

FAST READ

STR Mode 03h 0Bh 3Bh BBh 6Bh EBh

DTR Mode – 0Dh 3Dh BDh 6Dh EDh

Extended SPI Protocol

Supported Yes Yes Yes Yes Yes Yes

Command Input DQ0 DQ0 DQ0 DQ0 DQ0 DQ0

Address Input DQ0 DQ0 DQ0 DQ[1:0] DQ0 DQ[3:0]

Data Output DQ1 DQ1 DQ[1:0] DQ[1:0] DQ[3:0] DQ[3:0]

Dual SPI Protocol

Supported No Yes Yes Yes No No

Command Input – DQ[1:0] DQ[1:0] DQ[1:0] – –

Address Input – DQ[1:0] DQ[1:0] DQ[1:0] – –

Data Output – DQ[1:0] DQ[1:0] DQ[1:0] – –

Quad SPI Protocol

Supported No Yes No No Yes Yes

Command Input – DQ[3:0] – – DQ[3:0] DQ[3:0]

Address Input – DQ[3:0] – – DQ[3:0] DQ[3:0]

3V, 256Mb: Multiple I/O Serial Flash Memory

READ MEMORY Operations

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n25q_256mb_65nm.pdf - Rev. W 11/16 EN

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