W25Q256FVBIF-TR Datasheet, PDF (37/108 Pages) Winbond – 3V 256M-BIT SERIAL FLASH MEMORY WITH DUAL/QUAD SPI & QPI

W25Q256FV
8.2.6 Read Extended Address Register (C8h)
When the device is in the 3-Byte Address Mode, the Extended Address Register is used as the 4^th
address byte A[31:24] to access memory regions beyond 128Mb. The Read Extended Address Register
instruction is entered by driving /CS low and shifting the instruction code “C8h” into the DI pin on the
rising edge of CLK. The Extended Address Register bits are then shifted out on the DO pin at the falling
edge of CLK with most significant bit (MSB) first as shown in Figure 10.
When the device is in the 4-Byte Address Mode, the Extended Address Register is not used.
/CS
CLK
Mode 3
Mode 0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
DI
(IO0)
DO
(IO1)
* ^{= MSB}
Instruction (C8h)
High Impedance
Extended Addr. Reg. Out
Extended Addr. Reg. Out
76543210765432107
*
*
Figure 10a. Read Extended Address Register Instruction (SPI Mode)
/CS
CLK
IO0
Mode 3
Mode 0
012345
Instruction
C8h
40404
IO1
51515
IO2
62626
IO3
73737
Ext Add Reg Ext Add Reg
out
out
Figure 10b. Read Extended Address Register Instruction (QPI Mode)
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Publication Release Date: February 11, 2015
Preliminary – Revision H