m29dw640f Numonyx, m29dw640f Datasheet - Page 15

• Manufacturer Part Number: m29dw640f
• Description: 64 Mbit 8mb X8 Or 4mb X16, Multiple Bank, Page, Boot Block 3v Supply Flash Memory
• Manufacturer: Numonyx

M29DW640F
2.9
2.10
2.11
2.12
Reset/Block Temporary Unprotect (RP)
The Reset/Block Temporary Unprotect pin can be used to apply a Hardware Reset to the
memory or to temporarily unprotect all Blocks that have been protected.
Note that if V
if RP is at V
A Hardware Reset is achieved by holding Reset/Block Temporary Unprotect Low, V
least t
ready for Bus Read and Bus Write operations after t
See the Ready/Busy Output section,
Unprotect AC waveforms
Holding RP at V
and Erase operations on all blocks will be possible. The transition from V
slower than t
Ready/Busy Output (RB)
The Ready/Busy pin is an open-drain output that can be used to identify when the device is
performing a Program or Erase operation. During Program or Erase operations Ready/Busy
is Low, V
Erase Suspend mode.
After a Hardware Reset, Bus Read and Bus Write operations cannot begin until Ready/Busy
becomes high-impedance. See
AC waveforms
The use of an open-drain output allows the Ready/Busy pins from several memories to be
connected to a single pull-up resistor. A Low will then indicate that one, or more, of the
memories is busy.
Byte/Word Organization Select (BYTE)
The Byte/Word Organization Select pin is used to switch between the x8 and x16 Bus
modes of the memory. When Byte/Word Organization Select is Low, V
x8 mode, when it is High, V
V
V
The Command Interface is disabled when the V
voltage, V
during power up, power down and power surges. If the Program/Erase Controller is
programming or erasing during this time then the operation aborts and the memory contents
being altered will be invalid.
A 0.1µF capacitor should be connected between the V
Ground pin to decouple the current surges from the power supply. The PCB track widths
must be sufficient to carry the currents required during Program and Erase operations, I
CC
CC
provides the power supply for all operations (Read, Program and Erase).
PLPX
Supply Voltage
OL
LKO
. After Reset/Block Temporary Unprotect goes High, V
. Ready/Busy is high-impedance during Read mode, Auto Select mode and
ID
PHPHH
PP
. This prevents Bus Write operations from accidentally damaging the data
.
.
/WP is at V
ID
will temporarily unprotect the protected Blocks in the memory. Program
.
.
IL
IH
, then the four outermost boot blocks will remain protected even
, the memory is in x16 mode.
Table 20
Table 20
and
Figure 16: Reset/Block Temporary Unprotect
and
CC
Figure 16: Reset/Block Temporary
Supply Voltage is less than the Lockout
PHEL
CC
or t
Supply Voltage pin and the V
RHEL
IH
, whichever occurs last.
, the memory will be
IL
Signal descriptions
, the memory is in
IH
to V
ID
must be
IL
, for at
15/74
SS
CC3
.