M29W640GB NUMONYX [Numonyx B.V], M29W640GB Datasheet - Page 17

• Manufacturer Part Number: M29W640GB
• Description: 64 Mbit (8Mb x8 or 4Mb x16, Page) 3V supply Flash memory
• Manufacturer: NUMONYX [Numonyx B.V]

M29W640GH, M29W640GL, M29W640GT, M29W640GB
2.9
2.10
2.11
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
even 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,
Characteristics
details.
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
Characteristics
details.
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
PLPX
OL
. After Reset/Block Temporary Unprotect goes High, V
. Ready/Busy is high-impedance during Read mode, Auto Select mode and
PHPHH
PP
/WP is at V
and
and
ID
ID
will temporarily unprotect the protected Blocks in the memory. Program
.
.
Figure 17: Reset/Block Temporary Unprotect ac
Figure 17: Reset/Block Temporary Unprotect ac
IL
IH
, then the two or four outermost blocks will remain protected
, the memory is in x16 mode.
Table 20: Reset/Block Temporary Unprotect ac
Table 20: Reset/Block Temporary Unprotect ac
PHEL
or t
RHEL
IH
, whichever occurs last.
, the memory will be
waveforms, for more
waveforms, for more
IL
Signal descriptions
, the memory is in
IH
to V
ID
must be
IL
, for at
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