qh25f320s33b8 Numonyx, qh25f320s33b8 Datasheet - Page 32

• Manufacturer Part Number: qh25f320s33b8
• Description: Numonyx? Serial Flash Memory S33
• Manufacturer: Numonyx

Table 17: Main Array Protection Regions - Bottom Boot
Table 18: Main Array Protection Modes
8.4
8.4.1
Datasheet
32
W# Signal
BP2
0
0
0
0
1
1
1
1
V
V
V
V
IH
IH
Status Register Bits
IL
IL
BP1
0
0
1
1
0
0
1
1
SRWD Bit
SPI Instruction Cycle Examples
In this section, two SPI instruction cycles are explained in detail to provide a thorough
understanding of SPI instruction cycles in general. The intent of these examples is to
provide a foundation for all SPI instructions.
Fast Read
A Fast Read instruction uses 0Bh as an OP Code. After clocking in the OP Code, a 3-
byte address is clocked in (starting with the MSB), followed by a dummy byte. The
output serial data stream is clocked out on the falling edge of "C", one-half cycle after
the last dummy bit is clocked in. The timing diagram for a Fast Read command
sequence can be found in
Sequence” on page
Within the SPI interface, the address is automatically incremented internally as the
data is clocked out continuously and sequentially, as long as S# remains low. The
output data stream can be paused by bringing HOLD# low, and it can be continued by
(SR7)
0
1
0
1
BP0
0
1
0
1
0
1
0
1
Hardware
Software
Software
Software
Protect
Protect
Protect
Protect
Mode
Sectors 126 - 127
Sectors 124 - 127
Sectors 120 - 127
Sectors 112 - 127
Sectors 96 - 127
Sectors 64 - 127
33.
(upper 1/64)
(upper 1/32)
(upper 1/16)
(upper 1/8)
(upper 1/4)
(upper 1/2)
All Sectors
The SRWD bit (SR7) and the BP bits (SR[4:2]) are writable.
The SRWD bit (SR7) and the BP bits (SR[4:2]) are not writable. These bits
cannot be altered without raising W# to V
configuration, the Main Array Protection Regions cannot be changed.
The SRWD bit (SR7) and the BP bits (SR[4:2]) are writable.
The SRWD bit (SR7) and the BP bits (SR[4:2]) are writable.
64 M
None
Figure 15, “Timing Diagram for SPI Fast Read Command
Protected Main Memory Sectors
Sectors 62 - 63
Sectors 60 - 63
Sectors 56 - 63
Sectors 48 - 63
Sectors 32 - 63
(upper 1/64)
(upper 1/32)
(upper 1/16)
(upper 1/8)
(upper 1/4)
(upper 1/2)
All Sectors
Sector 63
Protection of SR
32 M
None
Numonyx™ Serial Flash Memory (S33)
IH
or device power-up. In this
Order Number: 314822-03
Sectors 30 - 31
Sectors 28 - 31
Sectors 24 - 31
Sectors 16 - 31
(upper 1/32)
(upper 1/16)
(upper 1/8)
(upper 1/4)
(upper 1/2)
All Sectors
All Sectors
Sector 31
16 M
None
December 2007