m29w400f Numonyx, m29w400f Datasheet - Page 15

• Manufacturer Part Number: m29w400f
• Description: 8-mbit 1 Mbit?8 / 512 Kbit?16 ; 4-mbit 512 Kbit?8 / 256 Kbit?16 Boot Block 3 V Supply Flash Memory
• Manufacturer: Numonyx

2.7
2.8
2.9
2.10
Write Enable (W)
The Write Enable, W, controls the bus write operation of the memory’s command interface.
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.
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
the
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
suspend mode.
After a hardware reset, bus read and bus write operations cannot begin until Ready/Busy
becomes high-impedance. See
characteristics
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 8-bit and 16-bit bus
modes of the memory. When Byte/Word Organization Select is Low, V
bit mode, when it is High, V
Section 2.9: Ready/Busy Output
PLPX
OL
. After Reset/Block Temporary Unprotect goes High, V
. Ready/Busy is high-impedance during read mode, auto select mode and erase
PHPHH
and
and
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
IH
, the memory is in 16-bit mode.
Table 15: Reset/block temporary unprotect AC
(RB),
Table 15: Reset/block temporary unprotect AC
PHEL
or t
RHEL
, whichever occurs last. See
IH
, the memory will be
waveforms, for more
waveforms.
IL
, the memory is in 8-
IH
to V
ID
must be
IL
, for at
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