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SPI(x1/x2/x4) NAND Flash

READ OPERATIONS

9.1 Page Read

The PAGE READ (13H) command transfers the data from the NAND Flash array to the cache register. The command

sequence is as follows:

• 13H (PAGE READ to cache)

• 0FH (GET FEATURES command to read the status)

• 03H or 0BH (Read from cache)/3BH (Read from cache x2)/6BH (Read from cache x4)/BBH (Read from cache

dual IO)/EBH (Read from cache quad IO)

The PAGE READ command requires a 24-bit address. After the block/page addresses are registered, the device starts

the transfer from the main array to the cache register, and is busy for tRD time. During this time, the GET FEATURE (0FH)

command can be issued to monitor the status. Followed the page read operation, the RANDOM DATAREAD

(03H/0BH/3BH/6BH/BBH/EBH) command must be issued in order to read out the data from cache. The output data starts

at the initial address specified in the command, and will continue until CS# is pulled high to terminate this operation.

Refer waveforms to view the entire READ operation.

9.2 Page Read to Cache (13H)

Figure9-1.Page Read to cache Sequence Diagram

Command

13H

CS#

SCLK

High-Z

9 10

28 29 30 31

23 22 21

24-bit address

CS#

Get Feature

0FH

CS#

SLK

High-Z

9 10 11 12 13 14 15

MSB

1 byte address

Data byte

MSB

SCLK

tCS

16 17 18 19 20 21 22 23 24

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