EN29LV641H/L EN29LV640U
TABLE 4. Autoselect Codes (Using High Voltage, VID)
A21
to
A14
to
A5
A92 A8 A7 A6 to
Description
CE# OE# WE#
A1 A0
DQ15 to DQ0
A15
A10
A2
H1
L
XX1Ch
XX7Fh
Manufacturer ID:
Eon
L
L
L
L
L
L
H
H
H
X
X
X
X
X
VID
VID
VID
X
X
X
L
L
L
X
L
L
L
H
L
Autoselect
Device ID
X
X
X
X
22D7h
XX01h
(Protected)
XX00h
Sector Protection
Verification
SA
H
(Unprotected)
L=logic low= VIL, H=Logic High= VIH, VID =11 ± 0.5V, X=Don’t Care (either L or H, but not floating!), SA=Sector
Addresses
Note:
1. A8=H is recommended for Manufacturing ID check. If a manufacturing ID is read with A8=L, the chip will output a
configuration code 7Fh.
2. A9 = VID is for HV A9 Autoselect mode only. A9 must be ≤ Vcc (CMOS logic level) for Command Autoselect
Mode.
ACC: Accelerated Program Operation
The device offers accelerated program operation which enables the programming in higher speed.
When ACC is raised to VHH, the memory automatically enters the Unlock Bypass mode (please refer to
“Command Definitions”), temporarily unprotects every protected sector groups, and reduces the
time required for program operation. The system would use a two-cycle program command sequence
as required by the Unlock Bypass mode. When ACC returns to VIH or VIL, normal operation resumes.
The transitions from VIH or VIL to VHH and from VHH to VIH or VIL must be slower than tVHH, see Figure 5.
Note that the ACC pin must not be left floating or unconnected. In addition, ACC pin must not be at VHH
for operations other than accelerated program. It could cause the device to be damaged. Never raise
this pin to VHH from any mode except Read mode; otherwise the memory may be left in an
indeterminate state.
A 0.1µF capacitor should be connected between the ACC pin and the VSS Ground pin to decouple the
current surges from the power supply. The PCB track widths must be sufficient to carry the currents
required during Unlock Bypass Program.
RESET#: Hardware Reset
When RESET# is driven low for tRP, all output pins are tristates. All commands written in the internal
state machine are reset to reading array data.
Please refer to timing diagram for RESET# pin in “AC Characteristics”.
Sector Group Protection & Unprotection
The hardware sector group protection feature disables both program and erase operations in any sector
group. The hardware chip unprotection feature re-enables both program and erase operations in previously
This Data Sheet may be revised by subsequent versions
or modifications due to changes in technical specifications.
©2005 Eon Silicon Solution, Inc., www.essi.com.tw
12
Rev. B, Issue Date: 2005/06/27
EON [ EON SILICON SOLUTION INC. ]
