S25FL064A Meet Spansion Inc., S25FL064A Datasheet - Page 19

• Manufacturer Part Number: S25FL064A
• Description: 64 Megabit Cmos 3.0 Volt Flash Memory With 50 Mhz Spi Bus Interface
• Manufacturer: Meet Spansion Inc.

9.6
20
Read Status Register (RDSR)
The Read Status Register (RDSR) command outputs the state of the Status Register bits.
the status register bits and their functions.
The RDSR command may be written at any time, even while a program, erase, or Write Status Register
operation is in progress. The host system should check the Write In Progress (WIP) bit before sending a new
command to the device if an operation is already in progress.
sequence, which also shows that it is possible to read the Status Register continuously until CS# is driven
high.
SCK
SO
CS#
SI
Bit
7
6
5
4
3
2
1
0
Mode 3
Mode 0
Hi-Z
Status Register Bit
SRWD
WEL
BP2
BP1
BP0
WIP
0
—
—
1
Figure 9.6 Read Status Register (RDSR) Command Sequence
Command
2
3
4
Status Register Write Disable
5
Write Enable Latch
Write in Progress
Table 9.2 S25FL064A Status Register
Bit Function
Block Protect
6
7
MSB
S25FL064A
—
—
7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7
8
D a t a
Status Register Out
9
10
11
S h e e t
12
1 = Protects when W# is low
0 = No protection, even when W# is low
Not used
Not used
000–111 = Protects upper half of address range in 5 sizes. See
Table 7.1 on page
1 = Device accepts Write Status Register, program, or erase
commands
0 = Ignores Write Status Register, program, or erase commands
1 = Device Busy. A Write Status Register, program, or erase
operation is in progress
0 = Ready. Device is in standby mode and can accept commands.
13
14
Figure 9.6
15
MSB
13.
shows the RDSR command
Status Register Out
S25FL064A_00_C3 June 29, 2007
Description
Table 9.2
shows