|
W25Q32FV Datasheet, PDF (19/99 Pages) Winbond – 3V 32M-BIT SERIAL FLASH MEMORY WITH DUAL/QUAD SPI & QPI | |||
|
◁ |
W25Q32FV
Figure 4b. Status Register-2
7.1.8 Erase/Program Suspend Status (SUS) â Status Only
The Suspend Status bit is a read only bit in the status register (S15) that is set to 1 after executing a
Erase/Program Suspend (75h) instruction. The SUS status bit is cleared to 0 by Erase/Program Resume
(7Ah) instruction as well as a power-down, power-up cycle.
7.1.9 Security Register Lock Bits (LB3, LB2, LB1) â Volatile/Non-Volatile OTP Writable
The Security Register Lock Bits (LB3, LB2, LB1) are non-volatile One Time Program (OTP) bits in Status
Register (S13, S12, S11) that provide the write protect control and status to the Security Registers. The
default state of LB3-1 is 0, Security Registers are unlocked. LB3-1 can be set to 1 individually using the
Write Status Register instruction. LB3-1 are One Time Programmable (OTP), once itâs set to 1, the
corresponding 256-Byte Security Register will become read-only permanently.
7.1.10 Quad Enable (QE) â Volatile/Non-Volatile Writable
The Quad Enable (QE) bit is a non-volatile read/write bit in the status register (S9) that allows Quad SPI
and QPI operation. When the QE bit is set to a 0 state (factory default for part numbers with ordering
options âIGâ, âIPâ and âIFâ), the /WP pin and /HOLD are enabled. When the QE bit is set to a 1(factory
default for Quad Enabled part numbers with ordering option âIQâ),, the Quad IO2 and IO3 pins are
enabled, and /WP and /HOLD functions are disabled.
QE bit is required to be set to a 1 before issuing an âEnter QPI (38h)â to switch the device from
Standard/Dual/Quad SPI to QPI, otherwise the command will be ignored. When the device is in QPI
mode, QE bit will remain to be 1. A âWrite Status Registerâ command in QPI mode cannot change QE bit
from a â1â to a â0â.
WARNING: If the /WP or /HOLD pins are tied directly to the power supply or ground during
standard SPI or Dual SPI operation, the QE bit should never be set to a 1.
- 18 -
Publication Release Date: Sept 16,, 2013
Revision H
|
▷ |