MX29LV320MB Macronix International, MX29LV320MB Datasheet - Page 13

• Manufacturer Part Number: MX29LV320MB
• Description: 32M-BIT [4M x 8/2M x 16] SINGLE VOLTAGE 3V ONLY FLASH MEMORY
• Manufacturer: Macronix International

STANDBY MODE
When using both pins of CE# and RESET#, the device
enter CMOS Standby with both pins held at VCC ± 0.3V.
If CE# and RESET# are held at VIH, but not within the
range of VCC ± 0.3V, the device will still be in the standby
mode, but the standby current will be larger. During Auto
Algorithm operation, VCC active current (ICC2) is required
even CE# = "H" until the operation is completed. The
device can be read with standard access time (tCE) from
either of these standby modes, before it is ready to read
data.
AUTOMATIC SLEEP MODE
The automatic sleep mode minimizes Flash device en-
ergy consumption. The device automatically enables this
mode when address remain stable for tACC+30ns. The
automatic sleep mode is independent of the CE#, WE#,
and OE# control signals. Standard address access tim-
ings provide new data when addresses are changed. While
in sleep mode, output data is latched and always avail-
able to the system. ICC4 in the DC Characteristics table
represents the automatic sleep mode current specifica-
tion.
OUTPUT DISABLE
With the OE# input at a logic high level (VIH), output
from the devices are disabled. This will cause the output
pins to be in a high impedance state.
RESET# OPERATION
The RESET# pin provides a hardware method of reset-
ting the device to reading array data. When the RESET#
pin is driven low for at least a period of tRP, the device
immediately terminates any operation in progress,
tristates all output pins, and ignores all read/write com-
mands for the duration of the RESET# pulse. The device
also resets the internal state machine to reading array
data. The operation that was interrupted should be
reinitiated once the device is ready to accept another
command sequence, to ensure data integrity
Current is reduced for the duration of the RESET# pulse.
When RESET# is held at VSS±0.3V, the device draws
CMOS standby current (ICC4). If RESET# is held at VIL
P/N:PM1129
13
but not within VSS±0.3V, the standby current will be
greater.
The RESET# pin may be tied to system reset circuitry.
A system reset would that also reset the Flash memory,
enabling the system to read the boot-up firmware from
the Flash memory.
If RESET# is asserted during a program or erase opera-
tion, the RY/BY# pin remains a "0" (busy) until the inter-
nal reset operation is complete, which requires a time of
tREADY (during Embedded Algorithms). The system can
thus monitor RY/BY# to determine whether the reset op-
eration is complete. If RESET# is asserted when a pro-
gram or erase operation is completed within a time of
tREADY (not during Embedded Algorithms). The system
can read data tRH after the RESET# pin returns to VIH.
Refer to the AC Characteristics tables for RESET# pa-
rameters and to Figure 3 for the timing diagram.
SECTOR GROUP PROTECT OPERATION
The MX29LV320MT/B features hardware sector group pro-
tection. This feature will disable both program and erase
operations for these sector group protected. In this de-
vice, a sector group consists of four adjacent sectors
which are protected or unprotected at the same time. To
activate this mode, the programming equipment must force
VID on address pin A9 and control pin OE#, (suggest
VID = 12V) A6 = VIL and CE# = VIL. (see Table 2) Pro-
gramming of the protection circuitry begins on the falling
edge of the WE# pulse and is terminated on the rising
edge. Please refer to sector group protect algorithm and
waveform.
MX29LV320MT/B also provides another method. Which
requires VID on the RESET# only. This method can be
implemented either in-system or via programming equip-
ment. This method uses standard microprocessor bus
cycle timing.
To verify programming of the protection circuitry, the pro-
gramming equipment must force VID on address pin A9
(with CE# and OE# at VIL and WE# at VIH). When A1=1,
it will produce a logical "1" code at device output Q0 for a
protected sector. Otherwise the device will produce 00H
for the unprotected sector. In this mode, the addresses,
except for A1, are don't care. Address locations with A1
= VIL are reserved to read manufacturer and device codes.
(Read Silicon ID)
MX29LV320MT/B
REV. 1.1 , JUL. 14, 2005
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