NX29F010
4
NexFlash Technologies, Inc.
NXPF001F-0600
06/22/00 ©
BUS OPERATIONS
Table 2. Device Bus Operations(1, 2)
Operation
CE
CE
CE
CE
CE
OE
OE
OE
OE
OE
WE
WE
WE
WE
WE
Address (A16-A0)
DQ0-DQ7
Read
L
L
H
AIN
Data Out
Write
L
H
L
AIN
Data In
Standby
VCC ± 0.5V
X
X
X
High-Z
Output Disable
L
H
H
X
High-Z
Notes:
1. L = VIL , H = VIH , X = Don't care, AIN = Address In.
2. The sector protect and sector unprotect functions must be implemented via programming equipment.
See the Sector Protection/Unprotection section.
Requirements for Reading Array Data
Upon device power-up, or after a hardware reset, the internal
state machine is set for reading array data. This ensures
that no spurious alteration of the memory content occurs
during the power transition. No command is necessary in
this mode to obtain array data. Standard microprocessor
read cycles that assert valid addresses on the device
address inputs produce valid data on the device data
outputs. The device remains enabled for read access until
the command register contents are altered.
The system must drive the
CE and OE pins to VIL to read
array data from the outputs.
CE is the power control and
selects the device.
OE is the output control that passes
array data to the output pins. During a READ operation,
WE
must remain at VIH.
Write Commands/Command Sequences
The system must drive
WE and CE to VIL, and OE to VIH to
write a command or command sequence (which includes
programming data to the device and erasing sectors of
memory).
An erase operation can erase one sector, multiple sectors,
or the entire device. The Sector Address Table (see Table 3)
indicate the address space that each sector occupies. A
"sector address" consists of the address bits required to
uniquely select a sector. See the "Command Definitions"
section for details on erasing a sector or the entire chip.
Table 3. Sector Addresses Table
Sector
A16
A15
A14
Address Range
Sector A0
0
0
0
00000H-03FFFH
Sector A1
0
0
1
04000H-07FFFH
Sector A2
0
1
0
08000H-0BFFFH
Sector A3
0
1
1
0C000H-0FFFFH
Sector A4
1
0
0
10000H-13FFFH
Sector A5
1
0
1
14000H-17FFFH
Sector A6
1
1
0
18000H-1BFFFH
Sector A7
1
1
1
1C000H-1FFFFH
After the system writes the auto-select command
sequence, the device enters the auto-select mode. The
system can then read auto-select codes from the internal
register (which is separate from the memory array) on
DQ7-DQ0. Standard read cycle timings apply in this mode.
Refer to the "Auto-select Mode and Auto-select Command
Sequence" sections for more information.
Program and Erase Operation Status
By reading the status bits on DQ7-DQ0, the system may
check the status of the operation during an erase or program
operation.
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