n25q256 Numonyx, n25q256 Datasheet - Page 48

• Manufacturer Part Number: n25q256
• Description: 256-mbit 3 V, Multiple I/o, 4-kbyte Subsector Erase, Xip Enabled, Serial Flash Memory With 108 Mhz Spi Bus Interface
• Manufacturer: Numonyx

Volatile and Non Volatile Registers
6.4.5
6.5
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If the Volatile Enhanced Configuration Register bit 3 is set to 0, after any quad modify
instruction (both in Extended SPI protocol and QIO-SPI protocol) there is a maximum
allowed time-out of 200ms after the last instruction input is received and the memory is de-
selected to raise the Vpp signal to Vpph, otherwise the modify instruction start at normal
speed, without the Vpph enhancement, and a flag error appears on Flag Status Register bit
3.
Output Driver Strength VECR<2:0>
The bits from 2 to 0 of the VECR set the value of the output driver strength, enabling to
optimize the impedance at Vcc/2 output voltage for the specific application as described in
Table 8.: Volatile Enhanced Configuration
The default values of Output Driver Strength is set by the dedicated bits of the Non Volatile
Configuration Register (NVCR), the parts are delivered with the output impedance at Vcc/2
equal to 30 Ohms.
Flag Status Register
The Flag Status Register is a powerful tool to investigate the status of the device, checking
information regarding what the memory is actually doing and detecting possible error
conditions. The Flag Status Register is composed of 8 bits, which are read by the Read
Status Register (RFSR) instruction.
Three bits provide a Status Indicator, and are set/reset automatically by the memory:
Four bits are error Indicators bits, and are set by the memory when some program or erase
operation fails or the user tries to perform a forbidden operation. The user can clear the
error indicators bits by mean of the Clear Flag Status Register (CLFSR) instruction:
n
n
n
n
Table 9.
7
6
5
4
3
2
1
0
Erase error bit
Program error bit
VPP 1 to 0 error bit
Protection error bit
BIT
Program/Erase Controller bit
Erase Suspend bit
Program Suspend bit)
P/E Controller (not WIP)
Erase Suspend
Erase
Program
VPP
Program Suspend
Protection
4-byte Address Enabling
Flag Status Register
Description
Micron Technology, Inc., reserves the right to change products or specifications without notice.
Register.
Status
Status
Error
Error
Error
Status
Error
Status
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Note
N25Q256 - 3 V