Datasheet

ManualsBrandsDIGILENT ManualsDev Kits410-340

4-Byte Address

To execute 4-byte READ MEMORY commands, S# is driven LOW. The command code is

input on DQn, followed by input on DQn of four 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 oper-

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

Table 26: Command/Address/Data Lines for READ MEMORY Commands – 4-Byte Address

Notes 1 and 2 apply to entire table

Command Name (4-Byte Address)

READ

FAST

READ

DUAL OUTPUT

FAST READ

DUAL

INPUT/OUTPUT

FAST READ

QUAD OUTPUT

FAST READ

QUAD

INPUT/OUTPUT

FAST READ

STR Mode 03h/13h 0Bh/0Ch 3Bh/3Ch BBh/BCh 6Bh/6Ch EBh/ECh

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]

Data Output – DQ[3:0] – – DQ[3:0] DQ[3:0]

Notes:

1. Yes in the "Supported" row for each protocol indicates that the command in that col-

umn is supported; when supported, a command's functionality is identical for the entire

column regardless of the protocol. For example, a FAST READ functions the same for all

three protocols even though its data is input/output differently depending on the pro-

tocol.

2. Command codes 13h, 0Ch, 3Ch, BCh, 6Ch, and ECh do not need to be set up in the ad-

dressing mode; they will work directly in 4-byte addressing mode.

3. A 4-BYTE FAST READ command is similar to 4-BYTE READ operation, but requires dum-

my clock cycles following the address bytes and can operate at a higher frequency (

C).

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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