NX29F010
NexFlash Technologies, Inc.
5
NXPF001F-0600
06/22/00 ©
Table 4. Auto-select Codes (High Voltage Method)
Description
CE
CE
CE
CE
CE
OE
OE
OE
OE
OE
WE
WE
WE
WE
WE
A16-A14
A13-A10
A9
A8-A2
A1
A0
DQ7-DQ0
Manufacturer
L
L
H
X
X
VID
X
L
L
01 (Hex)
Equivalent ID
Device
L
L
H
X
X
VID
X
L
H
20 (Hex)
Equivalent ID
Sector Protection
L
L
H
SA
X
VID
X
H
L
01H
Verification
(protected)
00H
(unprotected)
Note:
1. L = VIL , H = VIH , VID = 11.5 TO 12.5V , SA = ADDRESS SECTOR , X = Don't care.
Standby Mode
In the Standby Mode, current consumption is greatly
reduced, and the outputs are placed in the high impedance
state, independent of the
OE input. The system can place
the device in the standby mode when it is not reading or
writing to the device.
The device enters the CMOS standby mode when the
CE
pin is held at VCC ± 0.5V. The device enters the TTL standby
mode when
CE is held at VIH. The device requires the
standard access time (
tCE) before it is ready to read data.
If the device is deselected during erasure or programming,
the device draws active current until the operation is
completed.
Output Disable Mode
When the
OE = VIH, the output from the device is disabled
and the output pins are placed in the high-impedance state.
Auto-select Mode
The auto-select mode provides access to the manufacturer
and device equivalent codes, as well as sector protection
verification codes, via the DQ7-DQ0 pins. This mode is
primarilyintendedforprogrammingequipmenttoautomatically
match a device to be programmed with its corresponding
programming algorithm. However, the auto-select codes
can also be accessed in-system through the command
register.
When using programming equipment, the auto-select mode
requires VID (11.5V to 12.5V) on address pin A9. Address
pins A1 and A0 must be as shown in Auto-select Codes
(High Voltage Method), Table 4. In addition, when verifying
sector protection, the sector address must appear on the
appropriate highest order address bits. Refer to the corre-
sponding Sector Address Table (Table 3). The Command
Definitions table shows the remaining address bits that are
don't care. When all necessary bits have been set as
required, the programming equipment may then read the
corresponding identifier code on DQ7-DQ0.
To access the auto-select codes in-system, the host
system can issue the auto-select command via the
command register, as shown in the Command Definitions
table. This method does not require VID. See "Command
Definitions" for details on using the auto-select mode.
Sector Protection/Unprotection
The hardware sector protection feature disables both pro-
gram and erase operations in any sector. The hardware
sector unprotection feature re-enables both program and
erase operations in previously protected sectors.
Sector protection/unprotection procedure requires a high
voltage (VID) on address pin A9 and the control pins. Details
on this method are provided in a supplement. Contact an
NexFlash representative to obtain a copy of the appropriate
document.
The device is shipped with all sectors unprotected. NexFlash
offers the option of programming and protecting sectors at
its factory prior to shipping the device. Contact a NexFlash
representative for details.
It is possible to determine whether a sector is protected or
unprotected. See "Auto-select Mode" for details.
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