W25Q256JVEIQ-TR Datasheet, PDF (35/92 Pages) Winbond – 3V 256M-BIT SERIAL FLASH MEMORY WITH DUAL/QUAD SPI

W25Q256JV
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
- 34 -
Publication Release Date: September 20, 2016
Revision B