NX25F011B
NX25F021B
NX25F041B
Read Configuration Register (8BH)
The Read Configuration Register command provides
access to the configuration register, which stores the
current configuration of the HOLD-R/B pin, read clock
edge, write protect range, and alternate oscillator
frequency (Figure 7). The command sequence is similar
to the Read from Sector command except that the sector
address field S[15:0] and the byte-address field B[15:0]
are replaced with all 0 bits. After 16 control clocks and
1 after the Ready/Busy status field has been clocked
through, a 16-bit Configuration Data field CF[15:0]
provides the contents of the Configuration Register.
Although the field is 16-bits long, only bits CF[7:0] are
2 used. All other upper bits are reserved for future
features.
Read Configuration
Register
3
Command 16 Clocks 16 Clocks 16 Clocks
SI
8BH
0000H
0000H
0000H
4
SO
RB[15:0]
CF{15:0}*
*The CF Register only uses bits [7:0]
Read/Busy
Read Configuration Bits
Status
5
6
Read Status Register (83H)
The Read Status Register command provides access to
the status register and its status flags for Ready/Busy
(R/B), SRAM and program buffer transfer operations (TX),
Write Enable/Disable (WE), and Compare Not Equal (CNE)
(Figure 8). The command sequence is similar to the Read
7
8 From Sector command except that the sector address
field S[15:0] and the byte-address field B[15:0] are replaced
by all 0 bits. After 16 clocks and the Ready/Busy status field
9 RB[15:0] has been read, an 8-bit Status field ST[7:0]
provides the contents of the Status Register.
Read Status
Register
Command
16 Clocks
SI
83H
0000H
16 Clocks
0000H
16 Clocks
0000H
SO
RB[15:0]
ST[7:0]
Read/Busy Read Status
Status Register Bits
10
11
12
NexFlash Technologies, Inc.
27
PRELIMINARY NXSF016F-1201
12/12/01 ©