M29W128 View Datasheet(PDF) - Numonyx -> Micron
Part Name
Description
Manufacturer
M29W128 Datasheet PDF : 78 Pages
| |||
Signal descriptions
M29W128FH, M29W128FL
2.9
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 the blocks previously protected using a High Voltage
Block Protection technique (In-System or Programmer technique). Note that if VPP/WP is at
VIL, then the highest or lowest block will remain protected even if RP is at VID.
A Hardware Reset is achieved by holding Reset/Block Temporary Unprotect Low, VIL, for at
least tPLPX. After Reset/Block Temporary Unprotect goes High, VIH, the memory will be
ready for Bus Read and Bus Write operations after tPHEL or tRHEL, whichever occurs last.
See Section 2.10: Ready/Busy Output (RB), Table 24: Reset/Block Temporary Unprotect AC
characteristics and Figure 13 and Figure 14 for more details.
Holding RP at VID will temporarily unprotect all the blocks previously protected using a High
Voltage Block Protection technique. Program and erase operations on all blocks will be
possible. The transition from VIH to VID must be slower than tPHPHH.
2.10
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, VOL. Ready/Busy is high-impedance during Read mode, Auto Select mode and
Erase Suspend mode.
After a Hardware Reset, Bus Read and Bus Write operations cannot begin until Ready/Busy
becomes high-impedance. See Table 24: Reset/Block Temporary Unprotect AC
characteristics and Figure 13 and Figure 14.
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.
2.11
Byte/Word Organization Select (BYTE)
It is used to switch between the x8 and x16 Bus modes of the memory. When Byte/Word
Organization Select is Low, VIL, the memory is in x8 mode, when it is High, VIH, the memory
is in x16 mode.
2.12
VCC supply voltage (2.7V to 3.6V)
VCC provides the power supply for all operations (Read, Program and Erase).
The Command Interface is disabled when the VCC Supply Voltage is less than the Lockout
Voltage, VLKO. This prevents Bus Write operations from accidentally damaging the data
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 VCC Supply Voltage 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 program and erase operations, Icc2.
14/78
Share Link: 