IS25LQ016 Datasheet, PDF (46/52 Pages) Integrated Silicon Solution, Inc – 16 Mbit Single Operating Voltage Serial Flash Memory With 104

16 Mbit Single Operating Voltage Serial Flash Memory With 104
MHz Dual- or 100MHz Quad-Output SPI Bus Interface
IS25LQ016
Read Safe Guard register
The READ Safe Guard instruction code is transmitted via the SlO line, followed by three address bytes (A23 - A0) of
the first register location to be read. The first byte data (D7 - D0) addressed is then shifted out on the SO line, MSb
first. The address is automatically incremented after each byte of data is shifted out. The read operation can be
terminated at any time by driving CE# high (VIH) after the data comes out.
CS
SCK
12
7 8 9 10
23 24 25 26 31 32 33 34 39 40 41 42 47 48
SI
2Fh
A23-A0
1^st byte
2^nd byte
SO
D7-D0
D7-D0
Fig a. Timing waveform of Read Safe guard register
Erase Safe Guard register
If we want to erase the safe guard register to let the flash into unprotect status, it needs five continuous
instructions. If any instruction is wrong, the erase command will be ignored. Erase wait time follow product erase
timing spec.
Fig b. shows the complete steps for Erase safe guard register.
Program Safe Guard register
If we want to erase the safe guard register to let the flash into unprotect status, it needs five continuous
instructions. If any instruction is wrong, the program command will be ignored. The Program safe guard
instruction allows up to 256 bytes data to be programmed into memory in a single operation. Program wait time
follow product program timing spec.
Fig c. shows the complete steps for program safe guard register.
Integrated Silicon Solution, Inc.- www.issi.com
Rev. A
09/20/2012
46