SST26VF016B datasheet(21/77 Pages) MICROCHIP

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DS20005262C-page 21

SST26VF016B

5.12

SPI Dual-Output Read

The SPI Dual-Output Read instruction supports fre-

quencies of up to 104 MHz from 2.7-3.6V and up to 80

MHz from 2.3-3.6V. Initiate SPI Dual-Output Read by

executing an 8-bit command, 3BH, followed by address

bits A[23-0] and a dummy byte. CE# must remain

active low for the duration of the SPI Dual-Output Read

operation. See Figure 5-13 for the SPI Quad Output

Read sequence.

Following the dummy byte, SST26VF016B outputs

data from SIO[1:0] starting from the specified address

location. The device continually streams data output

through all addresses until terminated by a low-to-high

transition on CE#. The internal address pointer auto-

matically increments until the highest memory address

is reached, at which point the address pointer returns

to the beginning of the address space.

FIGURE 5-13:

FAST READ, DUAL-OUTPUT SEQUENCE

5.13

SPI Dual I/O Read

The SPI Dual I/O Read (SDIOR) instruction supports

up to 80 MHz frequency. Initiate SDIOR by executing

an 8-bit command, BBH. The device then switches to

2-bit I/O mode for address bits A[23-0], followed by the

Set Mode configuration bits M[7:0].CE# must remain

active low for the duration of the SPI Dual I/O Read.

See Figure 5-14 for the SPI Dual I/O Read sequence.

Following the Set Mode configuration bits, the

SST26VF016B outputs data from the specified address

location. The device continually streams data output

through all addresses until terminated by a low-to-high

transition on CE#. The internal address pointer auto-

matically increments until the highest memory address

is reached, at which point the address pointer returns

to the beginning of the address space.

The Set Mode Configuration bit M[7:0] indicates if the

next instruction cycle is another SPI Dual I/O Read

command. When M[7:0] = AXH, the device expects the

next continuous instruction to be another SDIOR com-

mand, BBH, and does not require the op-code to be

entered again. The host may set the next SDIOR cycle

by driving CE# low, then sending the two-bit wide input

for address A[23:0], followed by the Set Mode configu-

ration bits M[7:0]. After the Set Mode Configuration bits,

the device outputs the data starting from the specified

address location. There are no restrictions on address

location access.

When M[7:0] is any value other than AXH, the device

expects the next instruction initiated to be a command

instruction. To reset/exit the Set Mode configuration,

execute the Reset Quad I/O command, FFH. See Fig-

ure 5-15 for the SPI Dual I/O Read sequence when

M[7:0] = AXH.

CE#

SIO0

SCK

01234567 8

31 32

MODE 3

MODE 0

15 16

3BH

20005262 F52.3

39 40 41

A[23:16]

A[15:8]

A[7:0]

b6 b5

SIO1

Address

OP Code

Data

Byte 0

Dummy

Data

Byte N

b3 b1

b7 b4

b2 b0

MSB

Note: MSB = Most Significant Bit.

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